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B1 adverb 10 Min. Lesezeit

暑く

atsuku

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Erklärung 暑く in your Level:

At the A1 level, you are just starting to learn how to describe the world around you. You likely know the word 'atsui' (hot). At this stage, you encounter 'atsuku' primarily in two ways: making a sentence negative and saying 'it is becoming hot.' In Japanese, you cannot just add 'not' to an adjective. You have to change the 'i' at the end of 'atsui' to 'ku' and then add 'nai.' So, 'atsui' (it is hot) becomes 'atsuku nai' (it is not hot). This is one of the first grammar rules you learn for adjectives. You also learn 'atsuku naru,' which means 'to become hot.' Even if you don't use it perfectly yet, recognizing that 'atsuku' is just a different form of 'atsui' is a huge win for an A1 learner. Focus on the sound: if you hear 'atsui,' it's a description. If you hear 'atsuku,' something else is happening—like a negation or a change.

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By A2, you are expected to use 'atsuku' more actively in your daily life. You should be able to conjugate i-adjectives into their adverbial form without much hesitation. You will use 'atsuku naru' (become hot) to talk about the weather changing from spring to summer. You will also use 'atsuku nakatta' (was not hot) to describe your past experiences, like a vacation or yesterday's weather. At this level, you start to see 'atsuku' as a 'connector.' It connects the idea of 'hot' to verbs. You might say 'Heya wo atsuku shinaide kudasai' (Please don't make the room hot). Here, 'atsuku' is modifying the verb 'suru' (to make/do). This level is about building the habit of changing 'i' to 'ku' every time a verb follows the adjective.

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At the B1 level, where 'atsuku' is officially categorized, you should have a firm grasp of its grammatical functions and start noticing the nuance of which 'atsui' is being used. You are now expected to distinguish between 暑く (atmospheric heat) and 熱く (object heat) in writing. You will use 'atsuku' in more complex sentence structures, such as 'atsuku nattara' (if/when it becomes hot) or 'atsuku narisugiru' (to become too hot). You are also becoming aware of 'mushi-atsuku' (humidly hot), a very common variation in Japan. At B1, you use 'atsuku' to describe trends, such as 'The world is becoming hotter due to global warming.' You are moving beyond simple weather talk into discussing environmental changes and more specific physical sensations.

At the B2 level, 'atsuku' is a word you use fluently and with variety. You understand its role in formal vs. informal speech. You might use the more formal 'atsuku narimasu' in a presentation or the very casual 'atsuku nē' (a dialectal/slangy variation of atsuku nai) in a conversation with close friends. You also begin to understand how 'atsuku' functions in compound verbs and set phrases. You can describe the nuance of heat in different regions of Japan, using 'atsuku' to compare the dry heat of one place with the humid heat of another. Your focus at this level is on precision—ensuring that your use of 'atsuku' perfectly matches the verb and the social context of the conversation.

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At the C1 level, you are exploring the literary and metaphorical uses of the adverbial form. While 暑く is primarily for weather, you might encounter it in poetic descriptions of a 'hotly' burning sun or a summer that 'hotly' grips the land. You understand the historical development of the 'ku' adverbial form and how it relates to the older 'shiku' adjectives. You can read weather reports, scientific articles about climate change, and classical-style essays that use 'atsuku' in sophisticated ways. You are also sensitive to the regional dialects of Japan, where the adverbial form might be pronounced or used slightly differently, and you can adjust your understanding accordingly.

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At the C2 level, your mastery of 'atsuku' is indistinguishable from a native speaker. You use it effortlessly in all its forms—negatives, conditionals, and as a modifier for a wide range of verbs. You can engage in deep discussions about the impact of rising temperatures on Japanese society, using 'atsuku' and its related forms to express complex ideas about urban heat islands or seasonal shifts. You have a perfect command of the kanji distinctions and never confuse 暑く with its homophones. You might even use the word playfully in puns or creative writing, fully aware of the cultural weight that 'summer heat' carries in the Japanese psyche.

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暑く in 30 Sekunden

Adverbial form of 'atsui' (hot weather).
Used with 'naru' to mean 'become hot'.
Essential for making negative sentences (atsuku nai).
Specifically refers to atmospheric heat, not objects.

The Japanese word 暑く (atsuku) is the adverbial form of the i-adjective 暑い (atsui), which specifically describes atmospheric or weather-related heat. Unlike English, where we simply say 'it is getting hot,' Japanese grammar requires the adjective to transform into an adverbial form when it modifies a verb like なる (naru - to become) or when it is used in a negative construction. This transformation is fundamental for intermediate learners (B1) to master, as it bridges the gap between simple descriptions and dynamic expressions of change and state.

Grammatical Function: As an adverbial form, 暑く is created by dropping the final 'i' of 'atsui' and adding 'ku'. It primarily functions to modify verbs, most commonly 'naru' (to become), to indicate a change in the weather or environment.

だんだん暑くなってきましたね。(Dandan atsuku natte kimashita ne.)

It's gradually becoming hot, isn't it?

In Japanese culture, the changing of the seasons is a central theme in daily conversation. Using 暑く allows speakers to discuss the onset of summer, the intensity of the sun, or the stuffiness of a room. It is important to distinguish this from 熱く (atsuku), which sounds identical but refers to the temperature of physical objects like coffee or a hot bath. Using the wrong kanji or context can lead to confusion, though in spoken Japanese, the context of weather usually makes the meaning clear.

Common Usage Scenario: Weather reports frequently use this word to describe rising temperatures. For example, 'Tomorrow will become hot' is 'Ashita wa atsuku narimasu'.

今年の夏は例年より暑くなるそうです。(Kotoshi no natsu wa reinen yori atsuku naru sou desu.)

I heard this summer will be hotter than usual.

Beyond just 'becoming hot,' the adverbial form is the gateway to negative sentences. In Japanese, to say 'it is not hot,' you change 'atsui' to its adverbial form 'atsuku' and add 'nai'. This is a critical step in adjective conjugation that learners must internalize. Without the 'ku' transformation, the negative form cannot be constructed correctly.

The 'Ku' Connection: Think of the 'ku' ending as a 'connector' that allows the adjective to interact with other parts of the sentence, whether it's a verb of change or a negative state.

今日はそれほど暑くないですね。(Kyou wa sore hodo atsuku nai desu ne.)

It's not that hot today, is it?

In summary, 暑く is more than just 'hotly.' It is the functional form of 'hot' used for every situation that isn't a simple 'A is B' statement. Whether you are complaining about the rising temperature in an office or reading a forecast for a tropical vacation, this word is your primary tool for describing the intensity of the world's heat.

Using 暑く (atsuku) correctly involves understanding its role as a modifier. In Japanese, adjectives don't just sit next to verbs; they transform to harmonize with them. The most common partner for 暑く is the verb なる (naru), meaning 'to become.' This pair is essential for describing transitions in weather, time of day, or indoor climate.

With 'Naru' (To Become): This describes a change in state. 'Atsuku naru' translates to 'get hot' or 'become hot.' It can be used in various tenses: 'atsuku natta' (became hot), 'atsuku narimasu' (will become hot).

午後から急に暑くなりました。(Gogo kara kyuu ni atsuku narimashita.)

It suddenly became hot from the afternoon.

Another vital use of 暑く is in negative constructions. Beginners often try to say 'atsui nai,' which is grammatically incorrect. To negate an i-adjective, you must use the adverbial form followed by nai or arimasen. This makes 暑く the mandatory bridge for saying 'it isn't hot.'

Negation Pattern: Adjective Stem + く + ない. Example: 暑くない (Not hot). This can be further conjugated: 暑くなかった (Was not hot).

昨日の夜はあまり暑くなかったです。(Kinou no yoru wa amari atsuku nakatta desu.)

Last night wasn't very hot.

The word can also be used with verbs of feeling or perception. While less common than 'naru,' you might encounter it in literary or highly descriptive contexts where heat is described as 'beating down hotly' or 'feeling hot.' However, for B1 learners, focusing on 'naru' and 'nai' covers 90% of real-world usage.

Comparative Use: When comparing days, you use 'atsuku' to modify the verb. 'Today is becoming hotter than yesterday' = 'Kyou wa kinou yori atsuku natte iru'.

部屋が暑くなりすぎました。(Heya ga atsuku narisugimashita.)

The room became too hot (overly hot).

Finally, consider the use of 暑く in questions. 'Does it get hot in your country?' would use this form because it asks about the process of becoming hot. This versatility makes it one of the most hardworking forms of the adjective in a learner's repertoire.

You will hear 暑く (atsuku) most frequently during the Japanese summer, which officially spans from June to August but often feels much longer. It is a staple of 'Aisatsu' (greetings) and small talk. In Japan, commenting on the heat isn't just about the weather; it's a social lubricant used to establish rapport with neighbors, colleagues, and shopkeepers.

Daily Conversations: Step outside in Tokyo in July, and you'll hear 'Atsuku narimashita ne!' (It's become hot, hasn't it!) from almost everyone you meet. It's the standard way to acknowledge the shared physical struggle of the humidity.

「最近、暑くなってきたね」「本当にそうだね」

'It's started getting hot lately, hasn't it?' 'It really has.'

Media and broadcasting are other major sources. Weather forecasters on NHK or commercial channels use 暑く constantly when predicting heatwaves or seasonal shifts. They might say 'Kion ga agari, atsuku naru mikomi desu' (Temperatures will rise, and it is expected to become hot). The word carries a sense of warning during the peak of summer, often followed by advice to stay hydrated.

In Literature and Song: Summer is a popular theme in J-Pop and literature. Songs about summer memories often use 'atsuku' to describe the atmosphere of a festival (matsuri) or a beach trip, emphasizing the intensity of the season's heat.

夜になっても、まだ暑く感じます。(Yoru ni nattemo, mada atsuku kanjimasu.)

Even though it's night, it still feels hot.

In a professional setting, particularly in retail, staff might use the negative form to reassure customers. 'Ten-nai wa atsuku arimasen node, go-yukkuri douzo' (The inside of the store is not hot, so please take your time). This polite use of the adverbial negation is a hallmark of Japanese service culture.

Public Announcements: On trains during summer, you might hear announcements about 'jaku-reibou' (weak cooling) cars, where the temperature is managed so it doesn't get 'too cold' (samuku) but remains 'not hot' (atsuku nai).

Lastly, you will encounter 暑く in textbooks and language exams like the JLPT N4 and N3. It's a 'check' word to see if a student understands adjective conjugation. If you can hear the 'ku' and immediately recognize it as a transformation of 'atsui,' your listening comprehension is well on its way to the intermediate level.

The most frequent mistake English speakers make with 暑く (atsuku) involves the 'Two Atsui's' problem. In Japanese, there are two different kanji for the sound 'atsui': 暑い (weather/atmosphere) and 熱い (objects/touch). Because they sound identical, learners often use the wrong kanji when writing, or conceptually confuse them when speaking.

Mistake 1: Kanji Confusion: Using 熱く (atsuku) to describe the weather. While the pronunciation is the same, 熱く refers to things like a hot stove, hot water, or even a 'hot' passion. If you write 'The weather became hot' using 熱く, it looks like the air itself is a physical object you are touching.

❌ お湯が暑くなりました。(O-yu ga atsuku narimashita.)

Incorrect: The hot water became 'weather-hot'. (Correct: 熱く)

Another common error is the 'Double Particle' or 'Missing Ku' mistake. English speakers often want to translate 'become hot' literally, sometimes trying to use the particle 'ni' because 'naru' often takes 'ni' with nouns (e.g., sensei ni naru). However, with i-adjectives, the 'ku' ending replaces the need for any particle. Saying 'atsui ni naru' is a major grammatical error.

Mistake 2: The 'Nai' Trap: Saying 'Atsui nai' instead of 'Atsuku nai'. In English, we just add 'not' to 'hot'. In Japanese, the adjective must change its form to accept the 'nai'. This is the most common mistake for beginners moving into B1 levels.

❌ 今日は暑いないです。(Kyou wa atsui nai desu.)

Incorrect: Today is 'hot not'. (Correct: 暑くない)

Finally, learners sometimes confuse 暑く (atsuku) with 厚く (atsuku). This third 'atsui' means 'thick' (like a book or a slice of bread). While less common in weather contexts, if you are talking about 'thick clouds' and use the wrong kanji, the meaning shifts entirely. Context usually saves you in speech, but in writing, these distinctions are vital.

Mistake 3: Over-reliance on 'Very': In English, we say 'it's getting very hot.' Learners often say 'totemo atsuku naru'. While not wrong, Japanese has specific adverbs like 'mushia-atsuku' (humidly hot) or 'hageshiku' (intensely) that are often more natural. Don't forget to expand your vocabulary beyond 'totemo'.

To avoid these pitfalls, always visualize the sun when you use 暑く. If you aren't talking about the sun or the air, you probably need a different word. And always remember: 'i' changes to 'ku' before 'naru' or 'nai'.

While 暑く (atsuku) is the general term for 'hotly' regarding weather, Japanese is rich with nuanced alternatives that describe specific types of heat. Choosing the right one can make your Japanese sound much more natural and expressive.

1. 蒸し暑く (Mushi-atsuku): This is perhaps the most useful alternative in Japan. It combines 'mushi' (steaming) with 'atsuku'. Since Japanese summers are incredibly humid, you will hear this more often than the plain 'atsuku' during the rainy season and mid-summer.

今日は昨日より蒸し暑くなりそうですね。(Kyou wa kinou yori mushi-atsuku narisou desu ne.)

It looks like it will be more humidly hot today than yesterday.

Another common alternative is 暖かく (atatakaku). This means 'warmly' and is used for pleasant heat, like a spring day. If you use 暑く for a nice spring afternoon, people might think you are complaining that it's too hot. 暖かく is the positive, comfortable version.

2. 暖かく (Atatakaku) vs 暑く (Atsuku): Use 'atatakaku' for pleasant warmth (spring). Use 'atsuku' for intense, potentially uncomfortable heat (summer).

For the opposite of 暑く, you have two choices: 涼しく (suzushiku) and 寒く (samuku). 涼しく means 'coolly' and is usually positive (like a breeze in autumn), while 寒く means 'coldly' and is usually for winter temperatures.

Comparison Table

暑く (Atsuku): Hot (weather, general).
熱く (Atsuku): Hot (objects, passion).
蒸し暑く (Mushi-atsuku): Humid/Stuffy.
暖かく (Atatakaku): Warm/Pleasant.

夕方になって、ようやく涼しくなりました。(Yuugata ni natte, youyaku suzushiku narimashita.)

Evening came, and it finally became cool.

In formal settings, you might hear 高温 (kouon) which means 'high temperature'. While not an adverb, it's used in weather reports to describe the same phenomenon. However, in conversation, 暑く remains the king of convenience. Mastering its nuances and knowing when to swap it for 蒸し暑く or 暖かく will elevate your Japanese from functional to natural.

How Formal Is It?

Wusstest du?

The 'ku' ending in Japanese adverbs dates back over a thousand years. It was the standard way to turn an adjective into a form that could describe an action or a transition.

Aussprachehilfe

UK a-tsu-ku

US ɑ-tsu-ku

Japanese is a pitch-accent language. In standard Japanese (Tokyo), 'atsuku' generally has a low-high-low pattern, though it changes based on the following word.

Reimt sich auf

natsuku (懐く - to become attached) katsuku (渇く - to be thirsty - phonetically similar) tatsuku (立ちつくす - phonetically similar) utsuku (美しく - adverbial form of beautiful) yasuku (安く - cheaply) takaku (高く - highly) hikuku (低く - lowly) osoku (遅く - slowly/late)

Häufige Fehler

Pronouncing 'tsu' as 'su' (e.g., asuku).
Stressing the 'ku' too heavily like English adverbs.
Merging the syllables into 'ats-ku'.
Pronouncing 'a' like 'apple'.
Making the 'u' sounds too long.

Schwierigkeitsgrad

Lesen 3/5

The kanji 暑 is slightly complex but common. Must distinguish from 熱.

Schreiben 3/5

Writing the kanji requires attention to the 'sun' radical.

Sprechen 2/5

The pronunciation is easy, but remembering to use 'ku' instead of 'i' takes practice.

Hören 2/5

Easily recognized in context, though 'tsu' can be tricky for some.

Was du als Nächstes lernen solltest

Voraussetzungen

暑い (atsui) なる (naru) ない (nai) 天気 (tenki) 夏 (natsu)

Als Nächstes lernen

寒く (samuku) 涼しく (suzushiku) 暖かく (atatakaku) 蒸し暑い (mushiatsui) 熱中症 (netchuushou)

Fortgeschritten

酷暑 (kokusho) 陽炎 (kagerou) ヒートアイランド (heat island) 冷房 (reibou) 暖房 (danbou)

Wichtige Grammatik

I-Adjective Adverbial Form (-ku)

安い -> 安く, 速い -> 速く

Becoming a state (~ku naru)

暗くなる (become dark)

Negation of I-Adjectives (~ku nai)

美味しくない (not delicious)

Making/Doing (~ku suru)

短くする (make shorter)

Te-form for reason (~kute)

暑くて寝られない (can't sleep because it's hot)

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Beispiele nach Niveau

きょうはあつくないです。

Today is not hot.

Atsuku + nai is the negative form of atsui.

なつはあつくなります。

Summer becomes hot.

Atsuku + naru means 'to become hot'.

へやがあつくなりました。

The room became hot.

Past tense of naru is used here.

あしたはあつくなりますか。

Will it become hot tomorrow?

Question form of atsuku naru.

あまりあつくないですね。

It's not very hot, is it?

Amari is used with negative forms.

あつくなったら、まどをあけます。

If it gets hot, I will open the window.

Atsuku nattara is the 'if' form.

ここはあつくないです。

It is not hot here.

Simple negative statement.

だんだんあつくなります。

It gradually becomes hot.

Dandan means gradually.

昨日はあまり暑くなかったです。

Yesterday wasn't very hot.

Past negative form: atsuku nakatta.

午後から急に暑くなりました。

It suddenly became hot from the afternoon.

Kyuu ni means suddenly.

今年の夏は暑くなるそうですよ。

I heard this summer will be hot.

Sou desu indicates hearsay.

部屋を暑くしないでください。

Please don't make the room hot.

Atsuku suru means 'to make something hot'.

外は暑くなってきました。

It has started to get hot outside.

Natte kuru indicates a change starting to happen.

そんなに暑くないから、大丈夫です。

It's not that hot, so it's okay.

Sonna ni means 'that much'.

日本は６月から暑くなります。

Japan becomes hot from June.

Kara indicates the starting point.

夜も暑くて、寝られませんでした。

It was hot even at night, and I couldn't sleep.

Atatukute is the te-form used for reason.

地球温暖化で、世界中が暑くなっています。

Due to global warming, the whole world is becoming hotter.

Atsuku natte iru indicates an ongoing process.

最近、夜になっても暑く感じますね。

Lately, it feels hot even when it becomes night.

Atsuku kanjiru means 'to feel hot'.

エアコンが壊れて、部屋が暑くなってしまった。

The air conditioner broke, and the room ended up getting hot.

Natte shimau indicates an unfortunate result.

これ以上暑くなると、外に出られません。

If it gets any hotter than this, I won't be able to go outside.

Kore ijou means 'more than this'.

去年ほど暑くならないといいですね。

I hope it doesn't get as hot as last year.

Hodo used for comparison in negative sentences.

日差しが強くて、地面が暑くなっています。

The sunlight is strong, and the ground is becoming hot.

Describing the state of the environment.

雨が降った後は、いつもより蒸し暑く感じます。

After it rains, it feels more humidly hot than usual.

Mushi-atsuku is a common variation.

暑くならないうちに、散歩に行きましょう。

Let's go for a walk before it gets hot.

Naranai uchi ni means 'while it hasn't become...'.

温暖化の影響で、日本の夏は年々暑くなる一方だ。

Due to the influence of global warming, Japan's summers just keep getting hotter year by year.

Naru ippou da indicates a steady trend in one direction.

都市部ではコンクリートのせいで、夜も暑く感じやすい。

In urban areas, because of the concrete, it's easy to feel hot even at night.

Kanjiyasui means 'easy to feel'.

今年の夏は例年になく暑くなるという予報が出ている。

A forecast has been issued saying that this summer will be unusually hot.

Reinen ni naku means 'unusually' or 'unlike ordinary years'.

室内が暑くなりすぎないように、カーテンを閉めた。

I closed the curtains so the room wouldn't get too hot.

Narisuginai you ni means 'so that it doesn't become too...'.

梅雨が明けると、一気に暑くなってきますよ。

Once the rainy season ends, it will get hot all at once.

Ikki ni means 'all at once' or 'suddenly'.

これほど暑くなるとは、予想もしていなかった。

I hadn't even expected it to become this hot.

Naru to wa indicates surprise at a fact.

湿気が多いので、気温以上に暑く感じられます。

Because the humidity is high, it feels hotter than the actual temperature.

Kanjirareru is the potential/passive form of feel.

暑くても寒くても、彼は毎日ジョギングを欠かさない。

Whether it's hot or cold, he never misses his daily jog.

Atsukutemo... samukutemo uses the 'even if' structure.

ヒートアイランド現象により、都心の夜はさらに暑く過酷なものとなっている。

Due to the heat island effect, nights in the city center are becoming even hotter and more severe.

Atsuku... mono to natte iru is a formal descriptive structure.

異常気象の影響で、かつてないほど暑く乾燥した夏が続いている。

Due to abnormal weather, summers that are hotter and drier than ever before are continuing.

Atsuku kansou shita combines two descriptors.

太陽が照りつけ、アスファルトが暑く陽炎を立てている。

The sun is beating down, and the asphalt is hot, creating heat haze.

Atsuku modifies the state of the asphalt.

冷房を強くしても、西日のせいで部屋が暑くならざるを得ない。

Even if I turn up the AC, the room can't help but get hot because of the evening sun.

Narazaru wo enai means 'cannot help but become'.

かつての日本の夏は、これほどまでに暑くはなかったはずだ。

The Japanese summers of the past shouldn't have been this hot.

Atsuku wa nakatta emphasizes the negation.

温暖化対策を講じなければ、地球はますます暑く住みにくくなるだろう。

If we don't take measures against warming, the Earth will become increasingly hot and difficult to live on.

Atsuku suminikuku naru uses two adverbial forms.

その土地の夏は、肌を焼くように暑く、そして長い。

The summer of that land is hot as if to burn the skin, and long.

Literary use of atsuku to describe intensity.

どんなに暑くても、この伝統行事は中止されることはない。

No matter how hot it gets, this traditional event is never cancelled.

Donna ni atsuku temo means 'no matter how hot it is'.

気候変動の加速に伴い、夏季の気温が指数関数的に暑くなるリスクが懸念されている。

With the acceleration of climate change, there are concerns about the risk of summer temperatures becoming exponentially hotter.

Highly formal academic phrasing.

古来、日本人はこの暑く湿潤な気候と共生するための知恵を絞ってきた。

Since ancient times, Japanese people have squeezed out wisdom to coexist with this hot and humid climate.

Atsuku shitsujun na is a sophisticated pairing.

万葉の時代から、歌人たちは夏が暑くなる様を様々な言葉で紡いできた。

Since the Manyo era, poets have spun the way summer becomes hot with various words.

Atsuku naru sama means 'the way it becomes hot'.

冷房設備の普及は、室内が暑くなるという不快感から我々を解放したが、代償も大きい。

The spread of air conditioning equipment freed us from the discomfort of rooms becoming hot, but the price is high.

Atsuku naru to iu fukaikan uses a nominalized clause.

大気がこれほどまでに暑く淀んでいるのは、未曾有の事態と言えるだろう。

That the atmosphere is so hot and stagnant can be said to be an unprecedented situation.

Atsuku yodonde iru describes both heat and lack of movement.

温室効果ガスの排出抑制が急務であり、さもなくば地球は修復不可能なほど暑くなる。

Suppressing greenhouse gas emissions is urgent; otherwise, the Earth will become irreparably hot.

Shuufuku fukanou na hodo atsuku specifies the degree.

砂漠の夜明けは、一瞬の涼しさの後に、容赦なく暑く照りつける太陽を連れてくる。

Dawn in the desert brings, after a moment of coolness, a sun that beats down hotly without mercy.

Yousha naku atsuku describes the manner of the sun's heat.

都市計画において、街が暑くなりすぎないための「風の道」の確保が議論されている。

In urban planning, securing 'wind paths' so that the city does not become too hot is being discussed.

Atsuku narisuginai tame no is a purpose clause.

Häufige Kollokationen

暑くなる

暑くない

暑く感じる

暑くしすぎる

暑くなかった

急に暑く

だんだん暑く

異常に暑く

暑くても

暑くなってから

Häufige Phrasen

暑くなってきましたね

— It's started to get hot, hasn't it? A very common greeting in early summer.

「暑くなってきましたね」「そうですね、もうすぐ夏ですね」

暑くないですか？

— Isn't it hot? Used to check if someone else is comfortable.

部屋の温度はどうですか？暑くないですか？

暑くなったら言ってください

— Please let me know if it gets hot. Common in service or hospitality.

エアコンをつけますから、暑くなったら言ってください。

暑くならないうちに

— Before it gets hot. Used for planning activities in the morning.

暑くならないうちに、庭の掃除をしましょう。

暑くてたまらない

— It's so hot I can't stand it. (Uses the 'te' form derived from 'atsuku').

今日は暑くてたまらない。アイスが食べたい。

暑くも寒くもない

— Neither hot nor cold. Describes perfect, mild weather.

今の季節は暑くも寒くもなくて、一番好きです。

暑くなったり寒くなったり

— Getting hot and cold repeatedly. Describes unstable weather.

最近は暑くなったり寒くなったりで、体調を崩しやすい。

暑く感じられる

— To be felt as hot. Often used in weather reports.

日差しが強いため、体感温度はより暑く感じられます。

暑くはないけれど

— It's not hot, but... Used to introduce a nuance.

暑くはないけれど、少し湿気が気になります。

暑くなる一方だ

— It just keeps getting hotter. Used for trends.

地球の気温は上がる一方で、毎年暑くなる一方だ。

Wird oft verwechselt mit

暑く vs 熱く

Pronounced the same but used for objects (hot coffee) or emotions (hot passion).

暑く vs 厚く

Pronounced the same but used for thickness (a thick book).

暑く vs 暖かく

Used for pleasant warmth, while 'atsuku' is for intense heat.

Redewendungen & Ausdrücke

"暑くも寒くもない時期"

— A period that is neither hot nor cold; the 'Goldilocks' zone of weather.

暑くも寒くもない時期がもう少し長ければいいのに。

Neutral

"暑くなるにつれて"

— As it gets hotter. Used to describe things that change alongside the temperature.

暑くなるにつれて、冷たい飲み物が売れ始める。

Neutral

"暑く苦しい"

— Hot and painful/oppressive. Describes extreme summer conditions.

暑く苦しい夜が続き、寝不足気味だ。

Literary

"暑く照りつける"

— The sun beating down hotly.

砂漠では太陽が暑く照りつけている。

Descriptive

"暑く煮え返る"

— Literally 'boiling hot' but used for weather that feels like a cauldron.

都会のアスファルトは暑く煮え返っているようだ。

Metaphorical

"暑く長い夏"

— A hot and long summer. A common literary trope.

その年は、例年にないほど暑く長い夏だった。

Literary

"暑く湿った風"

— A hot and damp wind. Common in tropical descriptions.

南から暑く湿った風が吹き込んできた。

Neutral

"暑く火照る"

— To flush/glow hotly. Can refer to weather or a person's face.

日焼けのせいで顔が暑く火照っている。

Neutral

"暑く立ち込める"

— Heat hanging/shrouding an area. Often used for humid heat.

熱気が部屋の中に暑く立ち込めている。

Literary

"暑くもなんともない"

— Not hot at all. An emphatic negation.

これくらいの気温なら、私には暑くもなんともない。

Informal

Leicht verwechselbar

暑く vs 熱く

Identical pronunciation (atsuku).

暑く is for air/weather. 熱く is for things you touch or feelings.

お茶を熱くする (make the tea hot) vs. 部屋を暑くする (make the room hot).

暑く vs 厚く

Identical pronunciation (atsuku).

暑く is temperature. 厚く is physical thickness.

パンを厚く切る (slice bread thickly).

暑く vs 涼しく

Both describe weather changes.

暑く is getting hotter. 涼しく is getting cooler (usually pleasant).

夕方から涼しくなった。

暑く vs 暖かく

Both refer to heat.

暑く is usually 'too hot' or summer heat. 暖かく is 'warm' or 'cozy'.

春になって暖かくなった。

暑く vs 熱烈に

English 'hotly' can mean 'passionately'.

Japanese 'atsuku' (暑く) never means passionately. Use 'netsuretsu ni' or 'atsuku' (熱く) for that.

熱烈に歓迎する (welcome warmly/passionately).

Satzmuster

[Season/Time] は暑くなります。

夏は暑くなります。

[Place/Time] は暑くないです。

今日は暑くないです。

[Noun] が暑くなりました。

部屋が暑くなりました。

あまり暑くなかったです。

昨日はあまり暑くなかったです。

[Adverb] 暑くなってきました。

だんだん暑くなってきました。

暑くなったら、[Action]。

暑くなったら、泳ぎに行きましょう。

暑くならないうちに [Action]。

暑くならないうちに買い物に行きます。

暑くなりすぎる。

この部屋は暑くなりすぎます。

Wortfamilie

Substantive

暑さ (atsusa - the heat)

猛暑 (mousho - extreme heat)

酷暑 (kokusho - severe heat)

残暑 (zansho - lingering summer heat)

Verben

暑がる (atsugaru - to feel the heat/complain about heat)

Adjektive

暑い (atsui - hot weather)

Verwandt

熱い (atsui - hot to touch)

厚い (atsui - thick)

夏 (natsu - summer)

気温 (kion - temperature)

湿度 (shitsudo - humidity)

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So verwendest du es

frequency

Extremely high during summer months; rare in winter except in negative contexts.

Häufige Fehler

暑いになる (Atsui ni naru) → 暑くなる (Atsuku naru)
I-adjectives do not use 'ni' with 'naru'; they change to 'ku'.
熱くなる (Atsuku naru) - for weather → 暑くなる (Atsuku naru)
Used the wrong kanji. 熱 is for objects/feelings, 暑 is for weather.
暑いない (Atsui nai) → 暑くない (Atsuku nai)
To negate an i-adjective, the 'i' must become 'ku'.
暑くでした (Atsuku deshita) → 暑かったです (Atsukatta desu)
You don't use the adverbial 'ku' for the past tense of a standalone adjective. You use 'katta'.
暑くです (Atsuku desu) → 暑いです (Atsui desu)
You don't use the adverbial 'ku' with 'desu' unless it's negative (atsuku nai desu).

Tipps

The 'I' to 'KU' Rule

Always remember that for all i-adjectives, the 'i' must become 'ku' to modify a verb. This is a universal rule, not just for 'atsui'.

Small Talk Essential

Commenting on the weather is the #1 way to start a conversation in Japan. 'Atsuku narimashita ne' is your best friend in June.

Sun Radical

The kanji 暑 has the sun radical (日). Use this to remember it's for weather heat caused by the sun.

Mushi-atsuku

In Japan, 'hot' usually means 'humid'. Learn 'mushi-atsuku' to sound like a pro who understands the Japanese climate.

Listen for 'Naru'

Whenever you hear 'atsuku', your ears should immediately listen for 'naru' or 'nai' to understand the full context.

Polite Negation

Instead of just saying 'Atsuku nai', add 'desu' or use 'Atsuku arimasen' in formal situations.

Check Your Kanji

Before you write 'atsuku', ask: 'Am I talking about the air or a cup of coffee?' Air = 暑く. Coffee = 熱く.

The 'K' in 'KU'

Think of 'KU' as 'K'onnecting the adjective to the verb.

Pair with Antonyms

Learn 'atsuku naru' and 'samuku naru' together. They are the two most common weather change phrases.

Avoid Placeholder 'Ni'

English speakers often want to say 'atsui ni naru'. Force yourself to use 'atsuku' every time.

Einprägen

Eselsbrücke

Think of 'A-TSU-KU'. 'A' sun 'TSU' (too) 'KU' (cool-less). When it's 'atsuku', it's becoming too hot and losing its coolness.

Visuelle Assoziation

Imagine a thermometer rising under a bright red sun. The 'ku' at the end looks like a little arrow pointing up (く), showing the temperature is going up (atsuku naru).

Word Web

暑い (Hot) なる (Become) ない (Not) 夏 (Summer) 太陽 (Sun) 気温 (Temperature) 湿度 (Humidity) エアコン (AC)

Herausforderung

Try to use 'atsuku' in three different ways today: once to say it's not hot, once to say it's getting hot, and once to ask if a room is too hot.

Wortherkunft

The word 'atsui' (暑い) comes from Old Japanese. The kanji '暑' is composed of '日' (sun) and '者' (originally meaning a collection or pile, here suggesting the intensity of the sun).

Ursprüngliche Bedeutung: To be heated by the sun; atmospheric heat.

Japonic

Kultureller Kontext

Be careful not to confuse 暑く with 熱く (passionately/hot to touch) in formal writing, though they sound the same.

In English, we use 'hotly' for debates or competition, but rarely for weather. We say 'it's getting hot.' In Japanese, 'atsuku' is the grammatical equivalent of that 'getting'.

Weather forecasts on NHK (always using 'atsuku naru'). Summer songs by bands like TUBE or Southern All Stars. The opening lines of many summer-themed novels (e.g., Natsume Soseki).

Im Alltag üben

Kontexte aus dem Alltag

Weather Forecast

暑くなる見込みです
最高気温
暑さが続く
暑さ対策

Daily Greeting

暑くなってきましたね
今日は暑くないですね
毎日暑いですね
暑い中、お疲れ様です

At Home/Office

部屋が暑くなった
暑くないですか？
暑くしないで
エアコンをつける

Exercise/Sports

暑くなる前に走る
体が暑く感じる
暑さに慣れる
暑くて動けない

Travel Planning

その時期は暑いですか？
暑くない場所に行きたい
暑くなるのが早い
夜も暑いですか？

Gesprächseinstiege

"最近、急に暑くなってきましたね。体調はどうですか？"

"今年の夏は、去年より暑くなると思いますか？"

"部屋が少し暑くないですか？エアコンをつけましょうか？"

"あなたの国では、一番暑くなるのは何月ですか？"

"暑くなったら、どんな冷たい食べ物が食べたくなりますか？"

Tagebuch-Impulse

今日は昨日より暑くなりましたか？それとも涼しくなりましたか？詳しく書いてください。

もし明日、異常に暑くなったら、あなたは何をして過ごしますか？

子供の頃の夏と比べて、最近の夏は暑くなったと感じますか？

暑くならないうちに終わらせたい仕事や家事はありますか？

あなたが今までで一番『暑く』感じた場所はどこですか？その時の様子を教えてください。

Häufig gestellte Fragen

10 Fragen

No, you should use 熱く (atsuku) for hot water. 暑く is strictly for the temperature of the air or weather. Using 暑く for water would sound like you are saying the water has its own climate.

You say 'Atsuku nai desu.' You must change the 'i' in 'atsui' to 'ku' before adding 'nai'. This is the standard rule for all i-adjectives.

暑く is the adverbial form (e.g., 'becoming hot'). 暑くて is the 'te-form,' used to give a reason (e.g., 'Because it's hot, I'm tired') or to connect adjectives ('It's hot and humid').

Rarely, but it can be used in the negative: 'Kyou wa amari atsuku nai desu ne' (It's not very hot today, is it?), which is technically true but a bit odd to say in the middle of winter. You'd more likely say 'samui' (cold).

If you use the kanji 熱く, yes. But 暑く (the one for weather) is never used for passion. They sound the same, but the kanji and context define the meaning.

It's a very common seasonal greeting. It's a way of acknowledging the shift into summer and sharing the experience of the weather with others.

The verb 'naru' (to become) is by far the most common. You will also see 'suru' (to make) and 'kanjiru' (to feel).

It is a neutral grammatical form. Its formality depends on the verb that follows it. 'Atsuku naru' is informal; 'Atsuku narimasu' is polite.

No, that is a common mistake. I-adjectives never take 'ni' when used with 'naru'. They always change to the 'ku' form.

For weather heat, use 暑く. It has the 'sun' (日) radical at the top.

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