s'il fait très chaud means 'if the weather is very warm', or 'if it is very hot (outside)'
"il fait chaud" in French means "it's hot."
j'ai chaud means 'I am hot'. That does not mean the external temperature is actually high, but only that my own temperature is. Il fait chaud : the weather is hot/ the external temperature is warm. The same goes for "j'ai froid" (I 'm cold) and "il fait froid" (it's cold outside).
chaud e.g Il fait chaud.
il fait chaud - it's hot (weather)
"chaud" is hot in French. Il fait chaud = it's hot.
You can say "Il fait trรจs chaud dehors" in French to express that it is very hot outside.
It is hot is "il fait chaud" (the weather is hot, it is hot outside, etc..) or "c'est chaud" (about your food for instance)
Il fait très chaud.
Garder au chaud is keep warm in french. It is translated from English to French Language.
Il fait vraiment chaud dehors.
It is f*cking hot at Montreal