San Sebastián weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: May – October
What is the weather like in San Sebastián in January?
In January, San Sebastián is cool: daytime highs average 11 °C, and nights cool down to about 7 °C. The sea averages 12.8 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. It rains often – on about 16 days, adding up to 143 mm. All in all, January is not an ideal month for a holiday in San Sebastián.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 26 | 20 | 30 |
| Day | 12° | 11° | 12° |
| Night | 7° | 7° | 7° |
| Sea | 14° | 13° | 12° |
| Sun | 3 h | 3 h | 4 h |
| Rain days | 15 | 16 | 14 |
More details for January
- Daylight
- 9 h 18 min08:37 – 17:56
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 21 km/haverage daily peak
- Cloud cover
- 70 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 1 day1 cm or more of fresh snow
- Time zone
- UTC+1Europe/Madrid
How the score comes together
- Temperatureweight 50 %31 %
- Sunshineweight 20 %2 %
- Few rainy daysweight 30 %13 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- A jumper for the evenings
- Rain jacket or umbrella
San Sebastián in January: quick answers
Is San Sebastián hot in January?
No. In January, San Sebastián is cool: daytime highs average 11 °C and nights drop to about 7 °C.
Can you swim in San Sebastián in January?
Only if you don't mind cold water: in January the sea averages just 12.8 °C. Comfortable swimming is possible from July to September.
Does it rain much in San Sebastián in January?
It rains often – on about 16 days, adding up to 143 mm.
San Sebastián month by month
The whole year in San SebastiánAll destinations: SpainWhere to go in JanuarySea temperature in January
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)