Austria, Belgium, France, Germany, Poland and Switzerland have all experienced their hottest Septembers on record, with unseasonably high temperatures set to continue into October, in a year likely to be the warmest in human history.
As 31C (88F) was forecast in south-west France on Sunday and 28C in Paris, the French weather authority, Météo-France, said September’s average temperature was 21.5C, between 3.5C and 3.6C above the norm for the 1991-2020 reference period.