闷热的天气用英语怎么说？

闷热的天气

oppressive weather

oppressive

adj. 沉重的，压迫的，压抑的，沉闷；

例句
...one of the world's most oppressive and tyrannical regimes.
世上最压迫人、最专制的政权之一

weather

n. 天气， 气象，暴风雨；vt.& vi. 晒干， 风化；vt. 平安渡过， 挨过，[地]使风化；

例句
This type of weather is apt to be more common in winter.
这种天气在冬季往往更为常见。