France is enduring a historic heatwave, with Tuesday, June 23, 2026, officially recorded as the hottest day since national meteorological observations began in 1947. Temperatures soared across the country, and dozens of cities shattered their previous all-time highs.
Record-Breaking National Heat Index
According to Météo-France—the French national meteorological service—the national thermal index, calculated from daily and nighttime temperatures at 30 reference stations, reached 29.8°C—surpassing prior records set in 2019 and 2003, both at 29.4°C.
Extreme Heat in Western France
The situation was especially severe in western France, where new absolute temperature records were set in multiple cities: 43.3°C in Cazaux, 42.2°C in Niort, 42.1°C in Bordeaux, and 41.3°C in Rennes. The highest reading came in Pissos, in the Landes region, where the thermometer hit 44.3°C—one of the highest values ever recorded in the country.
Heatwave Far From Over
Meteorologists warn the heatwave has not yet peaked. Forecasts indicate exceptionally high temperatures will persist at least through the weekend, with daytime highs ranging between 40°C and 42°C. Nighttime lows are also expected to remain unusually high, offering little relief to residents.
Comparisons to the Deadly 2003 Heatwave
Météo-France assesses this year’s heatwave as at least comparable in intensity to the infamous August 2003 event—the deadliest in modern French history. Some experts suggest the current episode could even surpass 2003 in severity, though its full duration remains uncertain. The coming days are considered critical, as France continues to face a heatwave already etching itself into the nation’s meteorological record books.