Both are used and considered correct. fine isn't used much in AmEng for describing weather, but of course we recognize its meaning.
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guzhao67Is there any difference between "is" in the first sentence and "is" in "tomorrow is Monday"?"is" has a lot of different meanings. Therefore, you might have to paraphrase "is" in different ways in different contexts. (I think this is what you are asking.)
CalifJimguzhao67"is" has a lot of different meanings.
CJ
CJ, you're beginning to sound like a recent past president.
Philipyou're beginning to sound like a recent past presidentMaybe. Maybe not. It depends on what "you're" means, on what "beginning" means, on what "to sound" means, on what "like" means, ...