Today the rain was falling so hard I didn't want to go out. 方がいいと思うのでそれがより自然です。
heavy rain はちょっと変なの。
2015年9月2日
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I think it would sound better if you say " Because it is heavy rain today, I don´t go out or I don´t go out because it is heavy rain"....your sentence sounds a bit off, because it means that it is raining because you dont go out, because you do not go out, you made it rain somehow :) :) I hope you understand it :)