Can we say if the weather is rainy? Thanks teachers

Is there such a sentence as:

If the weather is rainy, I will read books at home.
Thanks, teachers:-D

You can.

Also "If it is rainy, I will read books at home" as it can be understood that the subject 'weather' is the ONLY thing that can be rainy so does not need to be mentioned.

Thank you soooo much for advising, Hobbes.:-D :-D