The heatwave that gripped France from June 22 to 28, 2026 leaves a heavy health toll in Île-de-France. According to a health situational report from Santé publique France, 619 additional deaths were recorded in the region during this week of extreme heat, a 60% rise in mortality. No other French region shows such pronounced excess mortality. The eight departments of Île-de-France, from Paris to Yvelines via Seine-Saint-Denis, were all placed under red alert for several days.
Health authorities urge readers to view these figures with caution. They note that these provisional data likely understate the real toll, which will be consolidated in the coming weeks. They do, however, provide a clear indication of the crisis's severity, with temperatures topping the 40°C mark in the region.
The region faces several compounding risks. It has the highest urban density in the country, creating a heat island effect that prevents temperatures from dropping at night. Added to this is an aging, sometimes isolated population that is particularly vulnerable to extreme heat.
Health indicators confirm it. From June 23 to 29, emergency room visits for heat-related illnesses surged, especially among people over 75. SOS Médecins recorded a similar trajectory, with a string of heat strokes and dehydration cases. In several Île-de-France hospitals, including the Georges-Pompidou European Hospital, emergency departments faced exceptional strain, with some doctors calling the situation extremely serious.
After a short spell of relief, the heat is already making a comeback. According to Météo-France, temperatures will rise again from Monday, July 6 to Sunday, July 12, 2026, with daytime highs around 35°C in Île-de-France. The nights look set to be uncomfortable as well, with overnight lows not dipping below 20°C.
This spell of heat is likely to be less intense than the historic heatwave in June, but the back-to-back days and nights of high temperatures remain dangerous, especially for people whose bodies are already strained. Doctors warn that heat-related effects can emerge several days after the peak. So the usual precautions apply: stay hydrated, avoid outdoor tasks during the hottest hours, and check in on the region’s most vulnerable neighbors. The Météo-France vigilance map, updated daily, remains the reference for tracking how the episode evolves in the region.
To stay on top of temperature trends in the region, we outline the latest forecasts in our piece on the July return of the heatwave to Paris and Île-de-France.
