Oulu weather in September 2025

Expect 54°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Oulu in September. Check more long-term weather averages for Oulu in September before you book your next holiday to Finland in 2025/2026.

  • 54°F maximum daytime temperature in September in Oulu54
    54°F max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Oulu16
    16 days with some rainfall
  • 41°F minimum night-time temperature in September in Oulu41
    41°F min night temperature
  • 13 hours of daylight per day in September in Oulu13
    13 hours of daylight per day
  • No heat & humidity in September in Oulu0
    No heat & humidity
  • 2.1 inches monthly rainfall in September in Oulu2.1
    2.1 inches of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Oulu2
    2 (Low) UV index
  • 52°F sea temperature in September in Oulu52
    52°F sea temperature

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The September weather guide for Finland (Oulu) 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)  |  Imperial (°F)

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How warm is it in Oulu in September?

Daytime temperatures usually reach 54°F in Oulu in September, falling to 41°F at night.

How sunny is it in Oulu in September?

There are normally 4 hours of bright sunshine each day in Oulu in September - that's 31% of daylight hours.

How warm is the sea around Oulu in September?

The average sea temperature around Oulu in September is 52°F.

Does it rain in Oulu in September?

There are usually 16 days with some rain in Oulu in September and the average monthly rainfall is 2.1 inches.

Oulu September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 04:57 19:37
Monday, 15th September 2025 05:40 18:45
Tuesday, 30th September 2025 06:25 17:49

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