I live in Puglia. I'm not there at the minute, but dp says it's been 40+ for about a week. We don't have aircon.
It sounds trite, but you do get used to it. I've only spent the COVID summers there as I work in the UK in July and most of August but 2020 and 2021 weren't as bad as I had imagined.
You learn how to deal with it when it's constant I think. Get up very early, most people are up and about in summer by 6/6.30. Do the grocery shopping at 8 as soon as everything's open. Eat differently. Go out much later at night. Had staff meal a fortnight ago and the booking was for 10.30pm.