And he prayed again; after the destroying the prophets of Baal. Baal-worship especially gave occasion to his former prayer, which he puts up out of his zeal to God's glory, then laid low by the Israelites idolatry, and a desire to have them by some exemplary punishment for their sin awakened to repentance. And the destruction of the idolaters, and reformation of the people, who now acknowledged the Lord to be God, might give occasion to this. And the heaven gave rain; i.e. the air or clouds, which had not been for three years before.
Related Commentaries of James 5:18
James 5:18
18 And he prayed again, and the heaven gave rain, and the earth brought forth her fruit.