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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Media Grid UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Based on the live forecast above, plan for a mix of mild, humid conditions with frequent rain showers. San Sebastian’s coastal climate means temperatures typically range from 8°C to 22°C, with autumn and winter bringing the most rainfall.
What is the average temperature and rainfall in San Sebastian by month?
San Sebastian experiences a temperate oceanic climate. The warmest months are July and August, averaging 20–22°C, while January and February are coolest at 8–10°C. Rainfall is significant year-round, with November and December the wettest (over 150mm per month); July and August are relatively drier, averaging 80–100mm. For san sebastian weather april, expect averages of 12–16°C with moderate rain. San sebastian weather december typically brings 8–12°C and high rainfall.
How reliable are 14-day and 30-day forecasts for San Sebastian?
Short-range forecasts (up to 7 days) are moderately reliable, but accuracy drops sharply beyond 10 days. A san sebastian weather 14 days outlook gives a useful trend, while a san sebastian weather 30 days projection is only a broad indication. For planning, check the live forecast above and a san sebastian weather 21 days overview for general patterns, but confirm nearer the time.
When is the best time to visit San Sebastian for good weather?
Late spring (May–June) and early autumn (September) offer the most comfortable conditions: mild temperatures of 16–20°C and fewer rainy days than winter. July and August are warmest but busiest.
Does San Sebastian have a lot of rain?
Yes, it is one of the wettest cities in Spain, with rain spread across the year. Even the driest month (July) sees around 80mm. A waterproof jacket is advisable for any visit, especially from October to April.
How accurate are long-range forecasts for San Sebastian?
Forecasts beyond 10 days have low reliability. Use a 14 or 21-day outlook for general trends, but make decisions based on the live forecast above and the 7-day detail. Always check updated data closer to your trip.
Sources
For more UK-focused forecasts, visit our UK weather hub or check the outlook for Bristol Weather and Glasgow Weather. If you need a longer view, see the 10 Day Weather Forecast UK.