I have just loaded the latest available temperature data from https://www.ecad.eu/dailydata/index.php.
This includes data until May 31 2026. On the Previous page I published on this topic, almost all of the highest temperature values recorded were from Spain. Now the picture is different. I suppose this is due to a difference in reporting times from different countries. I will try to clear this point up with the people of ecad.eu for future data loads.
In this latest picture you can see the highest temperature values up to May 31 were mainly recorded in Northern Europe (Netherlands and Finland mainly), and very high values indeed for these regions (37 - 38+ degrees Centigrade). Note the max_temp column is in tenths of degrees.