living in the "valley of the sun" takes some adaptive behavior.
i do at least 1, sometimes 2 weekends at the track every month, yes... even in the summer. i have found it pays to hydrate WELL in advance... pack plenty of sunblock, wear a flipping hat when the helmet is off AND pore ice water in your leathers right after you zip them up. it's REFRESHING and I'M SURE IT MAKES ME FASTER. nothing like ice water all the way to the corn-hole to wake ya up and light the fire of competition.
or you could get the under-mesh vest from joe rocket. whichever makes you happiest. me, i like the ice water.