San Sebastian, Spain
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San Sebastian

August beach and weather guide

Based on 5 years of historical ERA5 climate data

Photo by Alejandra Cifre González on Unsplash

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August beach conditions — historical average

Good
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25.3°C Temp
23.7°C Sea temp
5.2 Rain days
10.8h Sunshine hrs
82.2% Humidity
100%

Reliable conditions

5 of 5 years were good

Year by year — mid August

2025 Good 27.2°C · 5 rainy days · 10.7h sun
2024 Good 24.9°C · 6 rainy days · 10.7h sun
2023 Good 26.3°C · 4 rainy days · 11.2h sun
2022 Good 25.5°C · 6 rainy days · 10.5h sun
2021 Good 22.8°C · 5 rainy days · 10.9h sun

Other months in San Sebastian

June July August September

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About San Sebastian in August

Based on 5 years of ERA5 historical climate data, August in San Sebastian has historically been good for a beach holiday. Average temperatures of 25.3°C with sea temperatures around 23.7°C and 5.2 rainy days on average.

5 of the last 5 years had good beach conditions during this period. This data uses ERA5 reanalysis records — real historical measurements, not generalised averages.

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