The last time I was in Phoenix/Tempe it was 112 degrees! I think it was during your monsoon, so it was also kind of humid. I was on a work trip and my collegues wanted to go hiking early in the morning. Normally. I would go....but not in that weather. I woke to a news alert about people being missing in the area we wanted to hike in. I was convinced it was my co-workers.
It was not them, they were fine.
I like the area, but the temperatures are intimidating.