I just rode around yesterday in Gilbert's farmlands at 5PM. 110 in the beginning with tailwind. 105ish at the midpoint with headwind the rest of the way. 101 at the end with a drenched tri top. The heat really drains you, but I'm positive it will help you in the long run. I liken it to running inside the gym vs running outside. Many people can run all day inside the gym but sometimes can't run at all outside. You'll be prepared for any weather and be relatively unaffected. If it's too hot... Start and end at 5am-8:30am~ Still kind of cool.
I'd echo the comments above. Try to wear something where your sweat will evaporate quickly. And if you haven't tried hot Gatorade yet, don't. Almost threw up from the ultra sweetness, but it was the only thing I had to drink. I'm going to try and switch to chewable forms for my electrolytes.
Can't wait for 90 degree 7ishAM mornings!! Yay........