Lyon sits at the confluence of the Rhône and Saône rivers and has a semi-continental climate with around 830 mm (about 33 inches) of rain a year, fairly evenly spread across the seasons with a slight summer peak from convective thunderstorms. Its inland position between the Massif Central and the Alps means it can see intense, localized storms build quickly in warm months, sometimes bringing hail. The city’s river confluence has a long history of flooding during periods of sustained heavy rain upstream, though modern flood defenses have reduced the risk considerably. Because thunderstorms here can develop with little warning, radar remains a useful real-time check in summer. Météo-France operates the national weather radar network.
Learn more: How Does Rain Radar Work? · Open the full Rain Map