San Diegan here. Beach. That’s what we all do. Pool works too. And of course AC.
Get as much cold air inside overnight as possible then close all the doors and windows a little after sunrise. If your house is well insulated it’ll keep it relatively cool until after lunch. Also, keep the blinds closed on the side of the house actively getting sun.
Light weight or moisture wicking clothes.
Fans. Lots of them.
Damp washcloth on your neck or a spray bottle to mist yourself. If you want to step that up, put the washcloth in the freezer for a bit then wipe your face/neck down.