San Sebastián: Weather Guide & Climate
Complete month-by-month weather guide: San Sebastián. Best time to visit: May, June, July, August, September. Plan your trip with detailed climate data.
☀️ Climate Overview
San Sebastián has a Moderate climate with average yearly highs of 19°C, lows of 13°C, and approximately 15 rainy days per month.
The best time to visit San Sebastián is during May, June, July, August, September, when conditions are perfect for sightseeing and exploration
Drier season: Jan–Nov Wetter season: Mar–Dec
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Air Quality
Hottest
Coldest
Driest Month
Windiest Month
22 km/h
December (gusts 46)
Sea Temp Range
13° – 23°C
Warmest water: July (23°C)
Best for swimming: Jun, Jul, Aug, Sep, Oct (20°–23°C)
Forecast for your trip dates
Up to 14 days aheadWeather by Season
Spring
Mar–May
Summer
Jun–Aug
Autumn
Sep–Nov
Winter
Dec–Feb
Month-by-Month Weather Table
January
February
March
April
May
BestJune
BestJuly
BestAugust
BestSeptember
BestOctober
November
December
| Month | High | Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition | View Details |
|---|---|---|---|---|---|---|---|---|---|
| January | 13°C | 8°C | 15d (137mm) | 5.8h | 79% Humid | 2.3 Moderate | | Wet | View Details → |
| February | 15°C | 9°C | 12d (92mm) | 7.2h | 77% Humid | 3.6 Moderate | | Good | View Details → |
| March | 15°C | 10°C | 17d (120mm) | 8.6h | 75% Humid | 5.2 High | | Wet | View Details → |
| April | 17°C | 11°C | 14d (99mm) | 9.6h | 77% Humid | 6.9 High | | Wet | View Details → |
| May (best) | 20°C | 14°C | 16d (103mm) | 10.9h | 80% Very Humid | 8.1 Very High | | Excellent | View Details → |
| June (best) | 23°C | 17°C | 17d (131mm) | 10.4h | 83% Very Humid | 8 Very High | | Excellent | View Details → |
| July (best) | 24°C | 18°C | 12d (52mm) | 11.4h | 82% Very Humid | 8.4 Very High | | Excellent | View Details → |
| August (best) | 25°C | 19°C | 13d (98mm) | 10.6h | 82% Very Humid | 7.5 Very High | | Excellent | View Details → |
| September (best) | 23°C | 17°C | 15d (135mm) | 9.3h | 79% Humid | 5.8 High | | Excellent | View Details → |
| October | 21°C | 15°C | 13d (135mm) | 7.6h | 78% Humid | 4.1 Moderate | | Wet | View Details → |
| November | 16°C | 12°C | 15d (173mm) | 6.1h | 80% Very Humid | 2.5 Moderate | | Wet | View Details → |
| December | 14°C | 10°C | 18d (183mm) | 5.4h | 81% Very Humid | 2 Low | | Wet | View Details → |
San Sebastián
Basque culinary capital, including La Concha beach, La Concha beach promenade and Pintxos bar hopping in Parte Vieja, pintxos bars, and Michelin-starred dining.
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Frequently Asked Questions
What type of climate does San Sebastián have?
When is the best time to visit San Sebastián?
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Can you swim year-round in San Sebastián?
More San Sebastián Guides
Best Time to Visit
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Things to Do
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Cost & Budget
Daily costs, money-saving tips, and budget breakdown
Itineraries
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Overview
Complete travel guide for San Sebastián: top things to do, itineraries, and typical costs.