To be honest, it's not unusual for that part of the Europe to be pretty yellow in August. I was taking train rides to Budapest regularly between 2010-2020. But it's getting worse for sure.
It was getting bad already, but like this? Absurd.
But yes, the intensity and especially the duration of the heat has intensified. I stopped visiting my family in the south of Europe around five years ago, and visit in either fall or spring. Can't really take the heat, it's not worth it.
The cities will have to refactor themselves to avoid becoming ovens.