It’s eighteen degrees Centigrade [18℃] today. 今天气温是摄氏18度。

It’s eighteen degrees Fahrenheit [18 F] today. 今天气温是华氏18度。

The temperature has climbed to 35℃. 气温已上升到摄氏35度。

It’s five above (zero). 气温是5度。

It’s five below (zero). 气温是零下5度。

It’s 25 degrees. 气温是25度。

The temperature will drop twenty below. 气温将会降到零下20度。

The highest temperature during the day will be five below zero. 白天最高气温零下5度。

On a very hot day, he temperature reaches 35 C. 在很热的日子里，气温可达到摄氏35度。

The weather forecast says the highest temperature will be 3 degrees centigrade, and the lowest 6 degrees blow zero. 天气预报说最高气温是3度，最低气温零下6度。

According to the weather forecast, the temperature is expected to reach [hit] 40 degrees centigrade. 根据天气预报，气温可达摄氏40度。