Wow, you and I are twins, when it comes to heat. We are supposed to do a club ride Wednesday, with a high of 91. It won't get that hot by the ride's end, but with humidity, I am mildly concerned. However, the leader is my friend and he will stick to the moderate pace of an average of 13.5. It's pretty shady, but I am sure I will be pouring my water over my head.
I rode to and from the gym at 5:10 am and back at 6:40. It was cool, 70 and 93% humidity when I went, and much drier and pleasant when I came home. It's only 1.3 miles each way, and that is about all I wanted to do outside today.
Next weekend looks perfect for riding, but looking ahead, I am seeing heat again next week, when we do our annual Berkshires trip. It is hard and hilly riding; last year we cut a ride out and went out and did a 15 mile ride early in the AM, it was so hot one day. Not that there isn't a lot to do there, but I look forward to this trip every year.