Climate averages 1991–2020
Donostia / San Sebastián weather
in August.
A warm, moderately wet month: the warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Donostia / San Sebastián: daytime highs average 23.3°C and nights cool to about 17.4°C. By daytime temperature it is the warmest month of the year.
Expect about 89 mm of rain on roughly 13 days, which makes August a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 58 min on an average August day.
The nearest other city in this atlas is Pamplona (61 km away). In August its highs average 25.9°C, 2.6°C warmer than Donostia / San Sebastián, with 42 mm of rain.
Among the 93 cities listed in Spain, Donostia / San Sebastián ranks 88th of 93 for the warmest August highs and 92nd of 93 for the driest August (rainfall, lowest first). The mean August high of those 93 cities is 29.3°C; Donostia / San Sebastián is 6.0°C cooler than that mean.
From August to September, average highs fall by 1.9°C to 21.4°C, and monthly rainfall rises from 89 mm to 96 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Donostia / San Sebastián climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 11.2°C6.5°C | 6.5°C | 135 | 15.4 | 9.49 h |
| February | 11.6°C6.3°C | 6.3°C | 123 | 14.1 | 10.510 h |
| March | 13.7°C7.8°C | 7.8°C | 114 | 13.9 | 11.912 h |
| April | 15.1°C9.2°C | 9.2°C | 127 | 16.1 | 13.413 h |
| May | 18.0°C12.0°C | 12.0°C | 117 | 15.4 | 14.715 h |
| June | 20.6°C14.7°C | 14.7°C | 93 | 12.7 | 15.315 h |
| July | 22.4°C16.7°C | 16.7°C | 82 | 12.6 | 15.115 h |
| August, selected | 23.3°C17.4°C | 17.4°C | 89 | 12.9 | 14.014 h |
| September | 21.4°C15.6°C | 15.6°C | 96 | 12.9 | 12.513 h |
| October | 18.8°C13.3°C | 13.3°C | 128 | 14.3 | 11.111 h |
| November | 14.2°C9.6°C | 9.6°C | 170 | 15.7 | 9.810 h |
| December | 11.9°C7.5°C | 7.5°C | 138 | 15.1 | 9.09 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Pamplona in AugustSpain · 61 kmHigh 25.9°C · Low 15.3°C · 42 mm rain
- Gasteiz / Vitoria in AugustSpain · 77 kmHigh 25.1°C · Low 14.5°C · 32 mm rain
- Bilbao in AugustSpain · 77 kmHigh 23.2°C · Low 17.6°C · 55 mm rain
- Barakaldo in AugustSpain · 82 kmHigh 23.4°C · Low 17.5°C · 55 mm rain
- Logroño in AugustSpain · 102 kmHigh 26.9°C · Low 15.4°C · 26 mm rain
- Pau in AugustFrance · 131 kmHigh 24.5°C · Low 15.5°C · 104 mm rain
- Santander in AugustSpain · 149 kmHigh 24.4°C · Low 17.1°C · 60 mm rain
- Burgos in AugustSpain · 177 kmHigh 26.2°C · Low 13.7°C · 20 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Donostia / San Sebastián) is explained once on the Donostia / San Sebastián year overview and on the Sources, method and limits page.