Key Points

• This weekly bulletin presents the latest epidemiological monitoring of the heat wave that began on July 7, 2026, covering the period from July 7, 2026, to July 14, 2026.
• On July 7, 2026, after a day at the yellow alert level, all eight departments in the Île-de-France region were raised to an orange heat wave alert. From July 11, 2026, to July 14, 2026, all departments in the Île-de-France region were under a red heat wave alert.
• A regional analysis of emergency care utilization shows an increase in the proportion of emergency department visits related to the composite health indicator iCanicule (including hyperthermia, dehydration, and hyponatremia) among coded visits (ages 75 and older and all ages) since the start of the heatwave. There has also been an increase in the proportion of hospitalizations following visits related to the iCanicule indicator among coded hospitalizations (ages 75 and older, all ages) and an increase in the proportion of hospitalizations following visits related to the iCanicule indicator among visits related to the composite heatwave indicator (iCanicule) (age 75 and older, all ages).
• A regional analysis of SOS Médecins consultations indicates an overall increase in procedures related to the composite health indicator iCanicule (heatstroke, dehydration) since the start of the heatwave. Among those aged 75 and older, the trend has stabilized.
• This trend falls within the expected fluctuations given the current weather conditions. The decrease in the population of the Île-de-France region due to the usual summer vacation departures explains the overall decrease in emergency room visits and SOS Médecins procedures for all causes. This trend is observable across the region as a whole.