Key Points

• According to Météo France, a first heat wave occurred in the region between June 20, 2025, and June 26, 2025, affecting the departments of Isère and Rhône. A second heat wave began on June 28, 2025, and is still ongoing. It affects all departments in the region.

• A regional analysis of emergency care utilization indicates an increase in the iCanicule composite health indicator (including hyperthermia, dehydration, and hyponatremia) since the start of the first heat wave.

• Although the observed fluctuations fall within the expected range for the current weather conditions, vigilance must be heightened because these first two episodes have occurred early in the season and this situation is expected to persist.