In your first sentence, either rainy or raining could fit, depending on what you actually want to say; "... because it is raining" indicates that water is physically falling from the sky right now, while "because it is rainy" indicates that it is the sort of day where rain is extremely likely to happen, but doesn't necessarily mean that rain is ...
word usage - "It is raining" or "it is rainy"? - English Language ...
It is perfectly idiomatic to say “it is rainy” to mean “it is raining” and vice versa, m.m., the same for snowy, icy, etc. It is not necessary for snow or ice to accumulate to use these descriptions for the weather.
Are the words "snowy", "icy", and "rainy" used differently than the ...
Rainy isn't the same as raining. Rainy as an adjective, indicates such as the 'rainy season' - which isn't continuous rain. Raining is what is happening - 'it's raining', or 'it was raining an hour ago', for example. The two aren't synonymous.
"I don't like it when it is rainy." VS "I don't like it raining."
What are the best foods to have on a rainy day? What are the best foods to have for a rainy day? Which preposition would be appropriate here?
grammar - ON a rainy day or FOR a rainy day? - English Language ...
So, it seems like " it is rainy now " means " it is raining a lot now ". Ok, let say, we look out through the window, and the rain is falling from the sky, and the rain is light not too heavy or a lot.