Following the piece on songs about the rain, I looked for some songs about the sun or summer weather. I would guess that there won’t be as many happy songs about the sun as there are sad songs about the rain, and they won’t be as good. “Happiness writes white.”
Here are a few:-
(The Fab Four could write happy sometimes.)
(I think they were the first band I ever saw.)
(Sunshine on Leith, instead of floods threatening Leith.)
Fun Fun Fun doesn’t specifically mention a sunny day in California, but it’s hard to imagine it being set in Scotland’s Central Belt while a month’s worth of rain dumps in a day.