San Sebastian weather in August 2025

Expect 24°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in San Sebastian in August. Check more long-term weather averages for San Sebastian in August before you book your next holiday to Spain in 2025/2026.

  • 24°C maximum daytime temperature in August in San Sebastian24
    24°C max day temperature
  • 7 hours of sunshine per day
  • 13 days with some rainfall in August in San Sebastian13
    13 days with some rainfall
  • 15°C minimum night-time temperature in August in San Sebastian15
    15°C min night temperature
  • 14 hours of daylight per day in August in San Sebastian14
    14 hours of daylight per day
  • Low heat & humidity in August in San SebastianL
    Low heat & humidity
  • 90 mm monthly rainfall in August in San Sebastian90
    90 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in San Sebastian7
    7 (High) UV index
  • 22°C sea temperature in August in San Sebastian22
    22°C sea temperature

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The August weather guide for Spain (San Sebastian) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in San Sebastian in August?

Daytime temperatures usually reach 24°C in San Sebastian in August, falling to 15°C at night.

How sunny is it in San Sebastian in August?

There are normally 7 hours of bright sunshine each day in San Sebastian in August - that's 47% of daylight hours.

How warm is the sea around San Sebastian in August?

The average sea temperature around San Sebastian in August is 22°C.

Does it rain in San Sebastian in August?

There are usually 13 days with some rain in San Sebastian in August and the average monthly rainfall is 90mm.

San Sebastian August sunrise & sunset times

Browse the sunrise and sunset times for San Sebastian in August 2025. Select a month to view San Sebastian sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:58 20:30
Saturday, 16th August 2025 06:14 20:09
Sunday, 31st August 2025 06:31 19:45

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