I'm still not sure what the big deal is. The description sounds like a typical summer afternoon here in Phoenix. I don't mind riding my bike for a few hours at a time in direct sunlight when its 115F and in the middle of the afternoon. The hottest it has gotten here was I believe 123F, which was some time during the 90's.
Our average daily humidity is about 37%, though it runs about 10% in the afternoon most of the time, I can recall at least a few times where it was 35% humidity at 110F in the afternoon, and it didn't bother me.
However not this year. This year has had one of the coldest winters I can remember, and so far this summer it has rarely exceeded the triple digits, which is a little unusual for a non-monsoon year, but it's by far not the first time either.