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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Culture Observer weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
San Sebastian enjoys a mild maritime climate, with the best weather from June to September when average highs reach 24–26°C. Even in winter, temperatures rarely drop below 5°C, though rain is frequent year-round.
When is the best time to visit San Sebastian for good weather?
June through September offers the warmest, sunniest conditions, ideal for the beach and outdoor dining. July and August are peak season, with August averaging 25°C. For a quieter trip with still-pleasant weather, consider late May or early October. Rain is possible in any month, so pack accordingly.
What should I pack for a trip to San Sebastian?
Pack layers: a light jacket or jumper for cooler evenings, even in summer. A waterproof coat or umbrella is essential year-round, especially if you are checking the 10-day forecast before travelling. In winter (December–February), add a warm coat, scarf and sturdy shoes. For summer, bring swimwear, sun cream and a hat.
San Sebastian weather by month: a quick guide
Spring (March–May) sees temperatures from 14°C to 19°C, with increasing sunshine. Summer (June–August) is warm and the driest period. Autumn (September–November) stays mild but wetter. Winter (December–February) is cool and damp, with highs around 13°C. For longer-term planning, 30-day outlooks can help, though accuracy drops beyond 14 days. For those checking san sebastian weather april, expect 16–18°C and occasional showers. For san sebastian weather december, expect 11–13°C and frequent rain.
Is San Sebastian rainy all year?
Rain is common in every season, but summer (June–August) is noticeably drier, with about half the rainfall of winter. November is typically the wettest month.
Can I swim in the sea in San Sebastian?
Sea temperatures are most comfortable from July to September, reaching around 22°C. Outside these months, the water is cool, typically 12–16°C.
Does San Sebastian have a microclimate?
Its coastal location in the Basque Country gives it a temperate oceanic climate, cooler than inland Spain. The surrounding hills can trap cloud and rain, but conditions often change quickly.