I was doing research to find out how hot is too hot for my bike (Texas in July) and was pleased to learn that a well maintained air-cooled bike is usually fine as long as you can keep moving.
In my research, I found this article that said there are 3 things you should carry in hot weather: a charged cell phone, a water bottle with a 1/2 day supply of water and an umbrella for shade should you break down. I think these are excellent tips to heed for all of us headed to Texas. Another option for shade might be to set up your tent for some cover. Don't underestimate the danger of overheating yourself as well. Happy travels everyone.