Temps without any relationship to DewPt don't mean a whole a lot, especially in hotter areas.
A 115°F day in Phoenix in June with RH around 7-10% is really not that bad. Much much better than say 85°F in Georgia with DewPt's in the high 70°F's.
Sure it is hot, but when you get into a vehicle (190°F), lower the windows, turn on the AIR, and drive to end of the street is already getting comfortable. Try that when you are somewhere with real high DewPt's, you may never get the vehicle cooled down.
The other day, Iowa was having 101°F with Heat Indexes in the mid-130's... It was "ONLY" 108°F and it was a lot more comfortable than there or just about anywhere in the mid-west.
We like it hot in AZ... it keeps the population down. Can you imagine if we had winter weather here year round, there would be 90million people living in the state. The Snowbirds are bad enough when they are here now.
We are now in our "Monsoon" but it has been fairly dry so far with DewPts dropping below 60°F on a regular basis. No fun lightning at night and next to no rain, but it has been fairly comfortable this summer compared with most of the midwest lately.
I can imaging what people in the midwest think when they see us having a high of 119°F.... Armageddon ?? We had one of those the other day... RH was 7% in PHX that day. Hot, but not that bad.
Temps without RH, DewPt can be very misleading.