I understand that the general rule of thumb is to use "c'est" when followed by a noun (even when qualified by an adjective) and "il / elle est" when followed by an adjective - so why is it "C'est nuageux" rather than Il est nuageux." Is it to do with 'the weather' being inanimate and non specific? Or something else?
If I have understood your query correctly you could say both:
Il fait nuageux
You have to use the weather verb 'faire' not être in the second case.
Hope this helps!
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