San Sebastian, Spain Climate & Monthly Averages
San Sebastian has an oceanic climate. August is the hottest month, averaging 76° by day; January is the coldest at 53°.
How weather changes through the year in San Sebastian
San Sebastian runs on a dry-summer rhythm: the warmest months are also the driest. July averages 2.8 inches (70 mm) while the wet season peaks in November at 8.7 inches (221 mm). Highs range from 53°F (12°C) to 76°F (24°C).
San Sebastian climate quick facts
- Hottest month: August - highs near 76°F (24°C)
- Coldest month: January - highs near 53°F (12°C)
- Decade extremes (2015-2024): 104°F (40°C) high · 25°F (-4°C) low
- Wettest month: November (17 rainy days) · Sunniest: July (11.0 h sun/day)
- Climate type: oceanic
- Annual swing: 12°C between the average warmest and coolest month · day to night: 7°C
- Snow: about 4 days a year
- Average humidity: 80%
Temperatures, rain and sunshine
August is the warm end of the year, averaging 76°F (24°C) by day and 63°F (17°C) overnight. January sits at the other end of the year: 53°F (12°C) by day, 43°F (6°C) at night. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 104°F (40°C) and the lowest daily minimum 25°F (-4°C). November is the wettest month at 8.7 inches (221 mm) over 17 days; July is the driest.
July is the brightest month at 11.0 hours of sun a day, against an annual average of 8.4. Snow falls on roughly 4 days a year, mostly December through February. Days and nights are about 7°C apart on average - narrower than about 86% of the cities we track. Relative humidity averages 80% across the year, more humid than roughly 84% of the cities we track.
Where San Sebastian sits among other climates
- Annual precipitation is 68.1 inches (1730 mm) - wetter than 88% of the 3496 cities we track.
These comparisons use the same ten-year window for every city in the dataset.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 53° | 43° | 16 | 8.1 in | 5.4 h/day | 9.3 h | 51% | 80% |
| February | 56° | 44° | 15 | 6.8 in | 6.5 h/day | 10.4 h | 53% | 78% |
| March | 59° | 46° | 17 | 6.1 in | 8.0 h/day | 11.8 h | 54% | 76% |
| April | 62° | 49° | 14 | 4.7 in | 9.4 h/day | 13.4 h | 47% | 76% |
| May | 66° | 53° | 16 | 4.9 in | 10.4 h/day | 14.7 h | 51% | 81% |
| June | 71° | 59° | 14 | 4.4 in | 10.5 h/day | 15.4 h | 48% | 83% |
| July | 74° | 63° | 12 | 2.8 in | 11.0 h/day | 15.1 h | 39% | 82% |
| August | 76° | 63° | 12 | 4.0 in | 10.9 h/day | 13.9 h | 40% | 81% |
| September | 73° | 60° | 13 | 5.1 in | 9.9 h/day | 12.4 h | 43% | 80% |
| October | 69° | 56° | 13 | 5.5 in | 7.5 h/day | 10.9 h | 43% | 78% |
| November | 60° | 50° | 17 | 8.7 in | 6.0 h/day | 9.6 h | 56% | 80% |
| December | 57° | 47° | 14 | 7.2 in | 5.4 h/day | 9.0 h | 45% | 79% |
San Sebastian month by month
Each card shows the average high and low. The bar places that month between San Sebastian's coldest night and warmest afternoon.
January
- Rain
- 16 days
- Sunshine
- 5.4 h
- Daylight
- 9.3 h
February
- Rain
- 15 days
- Sunshine
- 6.5 h
- Daylight
- 10.4 h
- Snow
- 2 days
March
- Rain
- 17 days
- Sunshine
- 8.0 h
- Daylight
- 11.8 h
April
- Rain
- 14 days
- Sunshine
- 9.4 h
- Daylight
- 13.4 h
May
- Rain
- 16 days
- Sunshine
- 10.4 h
- Daylight
- 14.7 h
June
- Rain
- 14 days
- Sunshine
- 10.5 h
- Daylight
- 15.4 h
July
- Rain
- 12 days
- Sunshine
- 11.0 h
- Daylight
- 15.1 h
August
- Rain
- 12 days
- Sunshine
- 10.9 h
- Daylight
- 13.9 h
September
- Rain
- 13 days
- Sunshine
- 9.9 h
- Daylight
- 12.4 h
October
- Rain
- 13 days
- Sunshine
- 7.5 h
- Daylight
- 10.9 h
November
- Rain
- 17 days
- Sunshine
- 6.0 h
- Daylight
- 9.6 h
December
- Rain
- 14 days
- Sunshine
- 5.4 h
- Daylight
- 9.0 h
Looking for warmer alternatives? Browse warm places by month, or compare San Sebastian's coolest part of the year: January, February, December.
A season-by-season guide to San Sebastian
Spring (March through May)
Spring in San Sebastian runs cool rather than cold, with daytime highs averaging 62°F (17°C) and nights around 50°F (10°C); rain falls on around 47 of the 90 days.
Summer (June through August)
Summer in San Sebastian is mild and warm, with daytime highs averaging 74°F (23°C) and nights around 62°F (17°C); rain falls on around 39 of the 90 days. Daylight is generous - around 10.8 hours of sun a day.
Fall (September through November)
Fall stays on the cool side of mild here - highs near 67°F (20°C), nights near 55°F (13°C), and rain falls on around 43 of the 90 days.
Winter (December through February)
Winter is mild here - highs near 55°F (13°C), nights near 45°F (7°C), and rain falls on around 45 of the 90 days, plus about 3 snowy days.
Questions people ask about San Sebastian's climate
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The most useful weather window for San Sebastian
Best time to visit San Sebastian
The best time to visit San Sebastian is generally April to September, when the dry season is running but the afternoons are still bearable. Daytime temperatures in that window sit near 70°F (21°C), with rain on about 14 days a month. For the same question asked the other way round, see where else is warm in April.
What to pack
Pack for San Sebastian with a warm jacket and layers for the cooler season and proper waterproofs rather than an umbrella - wet days are the norm here. Note the gap between afternoon and night: August pairs 76°F (24°C) with 63°F (17°C).
San Sebastian temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.