These days our daily highs are about 104. I ride in the morning about 0830 for anywhere from 1-3 hours when the temp is in the high 80s to mid 90s. A few keys I've found that help: My Halo headband keeps the sweat out of my eyes. I drink 2 lg bottles per hour or so (the bottles are packed with ice before I start the ride). First bottle is water, next is weak gatorade or accelerade. I have ID'd a few key places to get COLD water. I take a brief break in the shade (2-5 minutes) to refill bottles and soak my head with the cold water.
On longer rides I carry a spare empty polar bottle in my jersey to fill just in case.
Like everyone I seek out shade as much as possible, but there isn't much to be had here.
+1 on the jersey colors. I only wear light colors. I've experimentd with wearing mesh or under armour under my jersey. I think a good jersey alone has been better.

I find that I drink more if the water is cold. Also, I find that I tolerate heat better now than I did in my twenties. Anyone else experience that?