San Sebastian weather in September 2026

Expect daytime maximum temperatures of 23°C in San Sebastian, Spain in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 13 days with some rainfall and typically 97 mm of rainfall in the month.

  • 23°C maximum daytime temperature in September in San Sebastian23
    23°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in San Sebastian13
    13 days with some rainfall
  • 14°C minimum night-time temperature in September in San Sebastian14
    14°C min night temperature
  • 12 hours of daylight per day in September in San Sebastian12
    12 hours of daylight per day
  • No heat & humidity in September in San Sebastian0
    No heat & humidity
  • 97 mm monthly rainfall in September in San Sebastian97
    97 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in San Sebastian5
    5 (Moderate) UV index
  • 21°C sea temperature in September in San Sebastian21
    21°C sea temperature

More about San Sebastian

San Sebastian by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Spain

Pierre & Vacances: Latest special offers on holidays

  • Save on 2026 holidays with latest Pierre & Vacances deals
  • Offers on beach, mountain, countryside & ski destinations
  • Book breaks to France, across Europe & beyond
Go to Pierre & Vacances deal >>

View all Pierre & Vacances offers

Pierre & VacancesHoliday accomodation

The September 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)

Back to top

More about Spain

How hot is it in San Sebastian in September?

Daytime temperatures usually reach 27°C in San Sebastian in September with no heat and humidity, falling to 14°C at night.

How sunny is it in San Sebastian in September?

There are normally 8 hours of bright sunshine each day in San Sebastian in September - that's 66% of daylight hours.

Does it rain in San Sebastian in September?

There are usually 7 days with some rain in San Sebastian in September and the average monthly rainfall is 27mm.

San Sebastian September sunrise & sunset times

Browse the sunrise and sunset times for San Sebastian in September 2026. Select a month to view San Sebastian sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 06:32 19:43
Tuesday, 15th September 2026 06:47 19:18
Wednesday, 30th September 2026 07:04 18:51

Related posts

Popular travel offers

Explore holiday destinations

More holidays

Save with latest deals & discounts

More deals

Airport parking

More parking

Airport lounges

More lounges

Top ^