Third extended heat wave within 6 weeks.
The previous one exceeded 40°C, and the buildings not yet had time to completely cool down from that one before the third wave hit.
I was considering putting up a tent in my garden myself, but as I own a ground floor flat, the indoor temperatures did, with the help of some additional cooling measures, thankfully not exceeded 27°C.
Telling a German to open windows is like telling a bird how to fly. Stoßlüften is down to a precise science here.
But it doesn’t matter with the temperatures and building construction style. They retain heat like crazy. It’s not getting cold enough at night for the buildings to lose all their thermal energy, even creating air flow through the building with a fan. Source: me with all my windows open in a 4th floor apartment with the inside temperature sitting at 28°C at near midnight.