San Sebastian sits in Spain’s ‘Green Spain’ region along the northern coast, where an oceanic climate brings the country’s highest and most evenly distributed rainfall, driven by Atlantic weather systems arriving through the Bay of Biscay.
On the Basque coast near the French border, the city faces frequent Atlantic storms funneled through the Bay of Biscay. Steep coastal terrain and numerous short, fast rivers mean that even routine Atlantic storms can raise water levels quickly, and radar is a standard tool AEMET uses alongside river gauges here. Learn more: Flash Flood Warning Signs on Radar · Open the full Rain Map