Welcome, from another Central Valley chickee.
Completely understand, first you need to collect the eggs every day because these high summer temps will begin incubation if left to themselves. It shouldn't kill the eggs unless we get record breaking temps this summer.
Second, ways to keep chickens cool (I know mine were panting this weekend). A fan in one corner of the coop/ run to help circulate air. I also freeze a 2 liter bottle of water, then I place it in a dish in the coop, remove cap and let the ice melt throughout the day, icy water to cool them down, some use misters in a corner of their coop/ run to allow birds to cool down. I have drip/ bubblers that go to my bushes and trees in the run that I run during the afternoon, my chicks love drinking from the bubblers. Make sure they have plenty of water and it stays cool, either in shade or add ice cubes. I use the deep litter method in my run, so my chicks like to dig down to the cool earth and lay down. Final thing I do is feed the fermented feed, it is basically feed soaked in water which turns into lots of great nutrients and probiotics, I feel the wet feed helps keep them hydrated.