It was a terribly hot summer day when the group of us appeared on the basketball court.

那是一个非常炎热的夏天，我们这群人出现在篮球场上。

youdao

It was terribly hot and I started to feel strange.

酷热难当，我逐渐感到不舒服。

《牛津词典》

It's been terribly hot these few days.

这几天热得利害。

《新英汉大辞典》

The wood-burning stoves needed constant attention, and they heated the entire house even in the terribly hot summers.

FORBES: Poverty in the Past