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.
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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 ...
The reason is that in the first sentence, "today is rainy", today is the object being described directly, so you don't need the pronoun 'it'. In the second however, there is a comma so after the comma, the 'it' pronoun is needed to make the sentence correct (hence the 'it's').