Our bay area home has tremendous southern exposure. Thankfully the attic is insulated, but I really wish we had gables so it would be easier to install a whole house fan. The house itself rarely breaks 80 but I have to use fans in the windows to cool it off at night; I can only imagine how much cooler the house would be if it wasn't (say) 120f in the attic.
Solar-powered attic fans might help (the southern exposure would let them generate plenty of power). Light-blocking shades on the outside of the south-facing / west-facing windows likely would help, too.
