(=very warm) chaud(e)
a hot bath un bain chaud
a hot country un pays chaud
to be hot
[person] avoir chaud
→ I was too hot and tired to eat anything.
I'm hot. J'ai chaud.
I'm too hot. J'ai trop chaud.
[thing] être chaud(e)
→ When the oil is hot, add the sliced onion.
→ The back of her neck was hot.
[weather] faire chaud
→ It was terribly hot yesterday.
It's hot. Il fait chaud.
It's very hot today. Il fait très chaud aujourd'hui.