Key Points

• A heat wave has been underway since June 18, 2026. As of June 22, 2026, Météo France has placed two departments (Allier and Puy-de-Dôme) under a red heat wave alert. The region’s ten other departments (Ain, Ardèche, Cantal, Drôme, Isère, Loire, Haute-Loire, Rhône, Savoie, and Haute-Savoie) are under an orange heat wave alert.
• A regional analysis of emergency care utilization indicates an increase in the composite health indicator iCanicule (which includes hyperthermia, dehydration, and hyponatremia) since the start of the heatwave. This trend is characterized by high fluctuations within an early, intense, and prolonged heat wave.
  At the departmental level, an increase in these indicators has been observed across all departments, particularly since June 22, 2026, with the exception of the Savoie department.
• Heat poses a health risk to the entire population. The observed health impacts underscore the importance of implementing preventive measures to mitigate the effects of the heat.