I don't see why "tomorrow will be hot" is not an acceptable translation. Hot seems like a perfectly good translation
@yah511 No but it's very simple, you can just Google it and probably get the basics of the tense down in like, 10 minutes. (Also I'm having problems with the DL app on mobile, replying to people, maybe someone check this?)
It sounds weird in English. The most common way to explain the future weather is to say "it will be warm/cold/hot tomorrow". I think it is because there needs to be a subject in English so you must put "it" in the sentence to create one.