Oslo weather in September 2025

Expect daytime maximum temperatures of 14°C in Oslo, Norway in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 16 days with some rainfall and typically 94 mm of rainfall in the month.

  • 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

More about Oslo

Oslo by month

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

Recommended for Norway

TUI: up to 8% off holidays booked online

  • Book online with TUI & save up to 8% on holidays
  • FREE child places available for select holidays
  • Pay £0 deposits with direct debit & spread the cost
Go to TUI deal >>

View all TUI offers

TUITUI deal finder

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^