Oslo weather in September 2025

Expect 14°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Oslo in September. Check more long-term weather averages for Oslo in September before you book your next holiday to Norway in 2025/2026.

  • 14°C maximum daytime temperature in September in Oslo14
    14°C max day temperature
  • 5 hours of sunshine per day
  • 16 days with some rainfall in September in Oslo16
    16 days with some rainfall
  • 7°C minimum night-time temperature in September in Oslo7
    7°C min night temperature
  • 13 hours of daylight per day in September in Oslo13
    13 hours of daylight per day
  • No heat & humidity in September in Oslo0
    No heat & humidity
  • 94 mm monthly rainfall in September in Oslo94
    94 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Oslo3
    3 (Moderate) UV index
  • 14°C sea temperature in September in Oslo14
    14°C sea temperature

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The September weather guide for Norway (Oslo) 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 Norway

How warm is it in Oslo in September?

Daytime temperatures usually reach 14°C in Oslo in September, falling to 7°C at night.

How sunny is it in Oslo in September?

There are normally 5 hours of bright sunshine each day in Oslo in September - that's 36% of daylight hours.

How warm is the sea around Oslo in September?

The average sea temperature around Oslo in September is 14°C.

Does it rain in Oslo in September?

There are usually 16 days with some rain in Oslo in September and the average monthly rainfall is 94mm.

Oslo September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:12 19:20
Monday, 15th September 2025 05:45 18:38
Tuesday, 30th September 2025 06:20 17:52

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