The weather changes very fast?

[Cinderella_Sz]

Please tell me can we say the weather changes very fast?

I wonder if the word "fast" is proper here

Thanks a lot.

[Gray]

I don't think that the use of 'fast' is improper here. 'Fast' is an adverb meaning 'quickly'. That may be the confusion I guess - 'fast' doesn't sound like an adverb.
_________________
First lesson - English, not english. I, not i. ~A student of English