Key Points

• From August 15, 2025, to August 17, 2025, and in the context of a heat wave, Météo-France issued an orange alert for two departments (Finistère and Morbihan) (covering 49.9% of the regional resident population) and a yellow alert for one department (Ille-et-Vilaine) (covering 32.3% of the regional resident population). Météo-France did not issue any specific regional alerts for August 19, 2025.

• The regional analysis of emergency care utilization indicates stability in the iCanicule composite health indicator (including hyperthermia, dehydration, and hyponatremia) over the 4-day period.

• This trend falls within the expected fluctuations for the meteorological conditions and is observable across the region as a whole and, in particular, in the departments of Finistère and Morbihan.