San Sebastián weather in April
Temperature, sea and sunshine in April: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in April
Fair
Best time to visit: May – October
What is the weather like in San Sebastián in April?
In April, San Sebastián is cool: daytime highs average 15 °C, and nights cool down to about 9 °C. The sea averages 13.8 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. It rains often – on about 15 days, adding up to 112 mm. All in all, April is a so-so month for a holiday in San Sebastián.
April compared
How the weather changes from March to May. Tap a month to open it.
More details for April
- Daylight
- 13 h 22 min07:27 – 20:49
- UV index
- 7 · highclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 18 km/haverage daily peak
- Cloud cover
- 66 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Madrid
How the score comes together
- Temperatureweight 50 %73 %
- Sunshineweight 20 %60 %
- Few rainy daysweight 30 %19 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in April
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
San Sebastián in April: quick answers
Is San Sebastián hot in April?
No. In April, San Sebastián is cool: daytime highs average 15 °C and nights drop to about 9 °C.
Can you swim in San Sebastián in April?
Only if you don't mind cold water: in April the sea averages just 13.8 °C. Comfortable swimming is possible from July to September.
Does it rain much in San Sebastián in April?
It rains often – on about 15 days, adding up to 112 mm.
San Sebastián month by month
The whole year in San SebastiánAll destinations: Spain
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)