Holy crap it's hot.
High 30s every day, and perhaps because the towns consist of stone streets and buildings, and perhaps because there's not much wind, but it feels much hotter than the equivalent temperatures we're used to in summer at home. (Edit: Others have pointed out humidity would be a factor too - perhaps the biggest. That may be the case, though at around 50%, it's not as humid as I've experienced elsewhere, including in Australia at times.)
We're heading to southern France next week, and the forecasts suggest the heat wave will still be in force then.
I mean, no complaints, we're feeling lucky to be here and are still having a great time, but boy, this is not what you expect in Europe.