天气很闷热—我觉得暴风雨要来了。

It's very heavy—I think there'll be a storm.

《牛津词典》

一看他的脸色，就知道暴风雨要来了。

One look at his face and we realized that a thunderstorm was about to break.

youdao

史蒂文：我同意，但是现在我们必须等。天空阴沉沉的，很是闷热。恐怕暴风雨要来了。

Steven: I agree with you. But now we have to wait. The sky is overcast, and it is very sultry. I fear a thunder storm is brewing.

youdao