A tiny chant for sending the rain away, said as much as read, with a rhythm children pick up after one hearing. Good for an actual rainy window.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Rain, rain, go away,
Come again another day;
Little Johnny wants to play.
About this rhyme
About as famous as nursery rhymes get, still chanted by children the moment it starts raining. There's nothing to explain here; it's a straightforward bit of weather lore turned into a wish, said out loud at a window with real feeling behind it.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition