气温多少度？

You can use this phrase as a standalone question. Just add a time or location at the start. For example, 今天气温多少度？ asks about today. If you are inside, you might ask about the AC. It works perfectly in both speech and text. You do not need fancy grammar here.

Use it when planning your outfit for the day. It is great for small talk with neighbors in the elevator. Use it when you are traveling to a new city. It is also perfect for checking if the office is too cold. It is a universal conversation starter in any weather-obsessed culture.

Do not use this to ask if someone has a fever. For body temperature, use 体温 instead of 气温. Also, avoid using it for cooking temperatures. For an oven or oil, just ask 多少度. Using 气温 for a cake would be very confusing. It specifically refers to the atmosphere around you.

In China, talking about the weather is a safe social lubricant. People often check the temperature to show care for elders. You might hear 'It is 30 degrees, drink more water!' It is less about the science and more about daily comfort. Celsius is the standard unit used across all of China.

You might hear people shorten it to 多少度？ in casual settings. Some might ask 今天几度？ which is even shorter. 几度 is very common among friends. Both are perfectly natural. If you want to be specific, add 摄氏 for Celsius, though it is usually assumed.