We've had highs >37° C for over a week in Frankfurt. It doesn't drop below 22 at night. It's worse in the cities- all the concrete radiates heat until late at night. Right now (ca. 11 p.m.) it's still around 30°! "Relief" is expected at the middle of next week at the earliest- frigid 30°.
My friends back in Sacramento told me that it got up to 108 a week or two ago. Still, I miss NorCal. I'll deal with the heat than take the 90 here in Georgia.