Bilbao weather in September 2025

Expect 24°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Bilbao in September based on long-term weather averages. There is usually 12 days with some rainfall and 71 mm of average monthly rainfall in September.

  • 24°C maximum daytime temperature in September in Bilbao24
    24°C max day temperature
  • 5 hours of sunshine per day
  • 12 days with some rainfall in September in Bilbao12
    12 days with some rainfall
  • 13°C minimum night-time temperature in September in Bilbao13
    13°C min night temperature
  • 12 hours of daylight per day in September in Bilbao12
    12 hours of daylight per day
  • No heat & humidity in September in Bilbao0
    No heat & humidity
  • 71 mm monthly rainfall in September in Bilbao71
    71 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Bilbao5
    5 (Moderate) UV index
  • 20°C sea temperature in September in Bilbao20
    20°C sea temperature

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The September weather guide for Spain (Bilbao) 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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More about Spain

How hot is it in Bilbao in September?

Daytime temperatures usually reach 24°C in Bilbao in September, falling to 13°C at night.

How sunny is it in Bilbao in September?

There are normally 5 hours of bright sunshine each day in Bilbao in September - that's 42% of daylight hours.

How warm is the sea around Bilbao in September?

The average sea temperature around Bilbao in September is 20°C.

Does it rain in Bilbao in September?

There are usually 12 days with some rain in Bilbao in September and the average monthly rainfall is 71mm.

Bilbao September sunrise & sunset times

Browse the sunrise and sunset times for Bilbao in September 2025. Select a month to view Bilbao sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:36 19:47
Monday, 15th September 2025 06:51 19:22
Tuesday, 30th September 2025 07:08 18:54

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