Large parts of southern and central Europe are experiencing unseasonably warm weather, with temperatures being about 5 °C and locally up to ~7 °C warmer than average for mid-September. One could say parts of Europe are in the midst of a late heat wave.
This is not unexpected, as the current weather pattern is highly favourable for very warm weather. Temperatures pushed into the upper 20s to mid 30s across the Iberian peninsula and upper 20s to lower 30s across much of France, Italy, the eastern Adriatic coast, the Pannonian basin and extreme southeastern Europe. Very warm weather for mid-September indeed! Meanwhile, the Mediterranean sea is also much warmer than average.
See the maps below for peak temperatures across Europe yesterday, September 11. All maps by Meteociel.fr.