It's not fun riding in that kind of heat. One thing that I've done that helps is to soak a cotton T-shirt in water and wear that - keep soaking it with more water as it dries out. Be sure and stay well hydrated and watch out for heat rash. I wouldn't ride in the middle of the day - wake up really early and try to get the bulk of your miles in before 11am.
Thanks for including pictures in your posts! That's beautiful country.