This is Chase164.
AT0298 Contest of Wind and Sun (loose connection only)
L351 + Contest: race between rain and dust; rain wins
Baer notes that Rainmaker, Rain, and Whirlwind occur in a North American Indian folktale (Kroeber: Papago Indians)
I really expected that this story would have some kind of African analogue; it surprises me that Baer did not find one.