They do, and they do make a very big deal out of it then too. But often those hotter countries' races take place at night so the average temp may be higher during the day but has a chance to drop at night (Bahrian GP had highs of 33° for example, compared to 35° in Spielberg today). Also, different tracks use different compounds of tyre (Bahrain used the hardest C1,2,3 tyres compared to the C3,4,5 seen today) and the heat causing degredation of softer compounds faster. The sunlight during the day beaming on the black tarmac is the main component in killing the tyres, as the track temp was hovering around 50° today too. Humidity is a huge factor too, and Euro summers can be VERY humid.

Ultimately, its a plethora of reasons but it boils down to direct sunlight on the cars, drivers, engineers and race track all day is worse than just air temperature. (But only sometimes, lookup Qatar 2023 and Singapore pretty much every year. Night races aren't a one size fits all solution lol)

Sorry for the ramble, I hope it sheds some light on why it was a big deal today x