Sorta anecdotal but I live in Phoenix, AZ and in the summer time it is regular 110f+ during the day and close to, if not still above 100f at night. Opening windows doesn't help.

Most of our electric bill in the summer goes to the AC unit(s). Some people have evap/swap coolers but those only go so far, and stop working during monsoons cause it's already too humid.

Edit: its 8:45am and 97f outside.