Key Points

• On August 11, 2026, the eight departments of the Île-de-France region (Paris, Essonne, Hauts-de-Seine, Yvelines, Seine-et-Marne, Seine-Saint-Denis, Val-de-Marne, Val-d’Oise) were under a yellow heat wave alert. As of August 12, 2026, all eight departments were upgraded to an orange heat wave alert. On Sunday, August 16, 2026, the eight departments were downgraded from the orange level back to the yellow level. On Monday, August 17, 2026, all departments were downgraded to the green level.
• A regional analysis of emergency care utilization shows stable numbers of visits for all causes and of hospitalizations following emergency room visits for the composite health indicator iCanicule (which includes hyperthermia, dehydration, and hyponatremia). There was also a decrease in emergency department visits for the composite health indicator iCanicule and in hospitalizations following visits for all causes.
• Regional analysis of SOS Médecins consultations also indicates stability in the iCanicule composite health indicator (heatstroke, dehydration) over the entire episode. There was an increase in SOS Médecins calls (no data available for Val-d’Oise) for all causes during the same period.
• This trend falls within the expected fluctuations given the current weather conditions and is observable across the region as a whole.