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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Daily Press UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above to plan your day in San Sebastian, as the city’s coastal microclimate means conditions can shift quickly from misty mornings to bright afternoons. You will want a jacket for the sea breeze even on sunnier days.
What is the weather like in San Sebastian by season?
San Sebastian experiences a mild oceanic climate, with no extreme heat or cold. Summers (June to September) are warm and pleasant, with average highs around 24–26°C, while winters (December to February) are cool and damp, often hovering between 8–14°C. The wettest months tend to be from October to March, so if you are looking at san sebastian weather december, expect frequent rain but also quieter streets.
How does the weather change throughout the year?
Spring (March to May) brings unpredictable mixes of sun and showers—check san sebastian weather april for layered clothing. Autumn (September to November) starts mild then turns wetter. For planning, san sebastian weather by month shows May and September as often offering the best balance of warmth and low rainfall. If you need to look ahead, check sources for san sebastian weather 14 days, san sebastian weather 21 days, or san sebastian weather 30 days, but note that long-range forecasts for coastal areas are less reliable beyond 10 days.
Does it rain a lot in San Sebastian?
Yes, it receives frequent rain year-round, especially between October and March. Showers often pass quickly, so it’s worth carrying a light waterproof jacket even in summer.
Is San Sebastian good for a beach holiday?
The city’s beaches are excellent, but water temperatures are cool (18–22°C in summer). July and August offer the warmest swimming conditions, though the sea breeze keeps air temperatures comfortable.
When is the best time to visit for good weather?
Late May, June and September provide warm, relatively settled conditions with fewer crowds than July and August. Check san sebastian weather 14 days ahead for a clearer outlook closer to travel.
Sources
For broader UK comparisons, explore our UK weather hub or check forecasts for Bristol Weather and Liverpool Weather. For longer-range planning, see our 10 Day Weather Forecast UK.