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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Public Report weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Expect a mild, showery day in San Sebastian; the live forecast above shows a high near 18°C with light winds and intermittent rain. The Bay of Biscay location drives changeable conditions, so a waterproof jacket is recommended if heading out.
What is the typical climate in San Sebastian?
San Sebastian has a temperate oceanic climate with moderate temperatures year-round. Average highs range from 12°C in January to 25°C in August. Annual rainfall is roughly 1,500 mm, spread evenly across the months, though October to December tend to be wettest. Sea temperatures peak around 21°C in August and drop to 12°C in February.
When is the best time to visit?
For sunnier, warmer days, June to September offers the most reliable dry spells, with August averaging 8 hours of sunshine daily. For those checking san sebastian weather april, spring brings mild temperatures (15–18°C) but frequent showers; it is quiet and cheaper. San sebastian weather december is cool (10–13°C) and wet, though festive atmosphere makes it appealing. Longer-range outlooks, such as san sebastian weather 14 days, san sebastian weather 21 days or san sebastian weather 30 days, are available from forecast services but have limited accuracy beyond a week.
What is the weather like in San Sebastian in April?
April averages 16°C high and 9°C low, with about 120 mm of rain spread over 14 days. Expect a mix of sunny breaks and light showers; layers and a waterproof jacket are advisable.
Does it rain a lot in San Sebastian?
Yes, the city receives rain on roughly 150 days per year, but showers are usually short-lived. The wettest months are November and December, while July and August are driest with around 100 mm each.
Will I need a coat in December?
Yes. December highs reach only 13°C, lows near 7°C, with frequent rain and wind. A warm, waterproof coat is essential; an umbrella is also useful.