If you googel mold, you should find that heavy rain will actually drown mold, so the rain itself is not the issue,its the humitity. So like the person above said, aeration is the key, give a good shake regardless, than if you are to harvesrt really inspect the plants for the start of mold, small pockets usually found (in my very limited experience) on the down side of the bud, and than just remove it. Good luck, oh and don't panic, its organic, lol...