Rennes sits in western France under an oceanic climate, with rain distributed fairly evenly across the year and driven mainly by Atlantic weather systems, particularly the autumn and winter storm season.
The Vilaine River flows through the city center, and its level is closely tracked during Brittany’s wetter autumn and winter months. While flooding here is usually a slower, river-driven process compared to the intense storms of southern France, an unusually strong Atlantic depression can still bring damaging short-term rainfall, and Meteo-France’s radar network helps track these systems as they move onshore. Learn more: Flash Flood Warning Signs on Radar · Open the full Rain Map