Eight words of weather wisdom: a shower with sunshine in it never lasts long. Simple and true, which is probably why it has survived so many generations.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
A sunshiny shower
Won't last half an hour.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition