San Sebastián weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: May – October
What is the weather like in San Sebastián in August?
In August, San Sebastián is warm: daytime highs average 23 °C, and nights cool down to about 17 °C. The sea averages 22.4 °C – refreshing for a swim. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 81 mm in total. All in all, August is a good month for a holiday in San Sebastián.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 74 | 73 | 72 |
| Day | 22° | 23° | 22° |
| Night | 17° | 17° | 16° |
| Sea | 22° | 22° | 21° |
| Sun | 7 h | 7 h | 6 h |
| Rain days | 13 | 13 | 13 |
More details for August
- Daylight
- 14 h 1 min07:12 – 21:13
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 6 daysdew point 18 °C or more
- Wind
- 15 km/haverage daily peak
- Cloud cover
- 58 %on average
- Hot days
- 2 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 %100 %
- Sunshineweight 20 %58 %
- Few rainy daysweight 30 %39 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
San Sebastián in August: quick answers
Is San Sebastián hot in August?
Warm rather than hot: in August, daytime highs in San Sebastián average 23 °C and nights cool to about 17 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in San Sebastián in August?
Yes. In August the sea averages 22.4 °C – refreshing for a swim.
Does it rain much in San Sebastián in August?
Rain is frequent, with about 13 rainy days and 81 mm in total.
San Sebastián month by month
The whole year in San SebastiánAll destinations: SpainWhere to go in AugustSea temperature in August
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)