Janice,
just wanted to tell you I'm there with you.
My son started football practice (his first HS year too) 2 weeks ago. It has been between 100 and 110 heat index for those 2 weeks. (Thanfully its let up to a wonderfully cool 80-85)
So good luck. I know I asked myself who was the nuttiest, the parents for driving or the coaches for not calling it off!