Key Points

• A heat wave affected France during week 33 of 2025. Météo France issued an orange “heat wave” alert for three departments in the Pays de la Loire region, effective from August 14, 2025, through the evening of August 17.

• A regional analysis of emergency care utilization indicates that the iCanicule composite health indicator (covering hyperthermia, dehydration, and hyponatremia) remained stable during the heatwave period.

• This trend falls within the expected fluctuations for the current weather conditions and is observable across the region as a whole.