And every plant of the field before it was in the earth, and every herb of the field before it grew: for the LORD God had not caused it to rain upon the earth, and there was not a man to till the ground. But there went up a mist from the earth, and watered the whole face of the ground.
( Genesis 2:5-6 )
On the 3rd day there was no rain upon the earth and there was not a man to till the ground. On the 6th day there was a man in the garden of Eden to dress it and to keep it, logically there was also rain.