San Sebastian weather in May 2025

Expect 18°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in San Sebastian in May. Check more long-term weather averages for San Sebastian in May before you book your next holiday to Spain in 2025/2026.

  • 18°C maximum daytime temperature in May in San Sebastian18
    18°C max day temperature
  • 6 hours of sunshine per day
  • 17 days with some rainfall in May in San Sebastian17
    17 days with some rainfall
  • 10°C minimum night-time temperature in May in San Sebastian10
    10°C min night temperature
  • 15 hours of daylight per day in May in San Sebastian15
    15 hours of daylight per day
  • No heat & humidity in May in San Sebastian0
    No heat & humidity
  • 107 mm monthly rainfall in May in San Sebastian107
    107 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in San Sebastian7
    7 (High) UV index
  • 16°C sea temperature in May in San Sebastian16
    16°C sea temperature

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The May 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 May?

Daytime temperatures usually reach 18°C in San Sebastian in May, falling to 10°C at night.

How sunny is it in San Sebastian in May?

There are normally 6 hours of bright sunshine each day in San Sebastian in May - that's 39% of daylight hours.

How warm is the sea around San Sebastian in May?

The average sea temperature around San Sebastian in May is 16°C.

Does it rain in San Sebastian in May?

There are usually 17 days with some rain in San Sebastian in May and the average monthly rainfall is 107mm.

San Sebastian May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 06:01 20:10
Friday, 16th May 2025 05:43 20:27
Saturday, 31st May 2025 05:31 20:41

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