Trondheim weather in September 2025

Expect 12°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Trondheim in September. Check more long-term weather averages for Trondheim in September before you book your next holiday to Norway in 2025/2026.

  • 12°C maximum daytime temperature in September in Trondheim12
    12°C max day temperature
  • 3 hours of sunshine per day
  • 24 days with some rainfall in September in Trondheim24
    24 days with some rainfall
  • 6°C minimum night-time temperature in September in Trondheim6
    6°C min night temperature
  • 13 hours of daylight per day in September in Trondheim13
    13 hours of daylight per day
  • No heat & humidity in September in Trondheim0
    No heat & humidity
  • 133 mm monthly rainfall in September in Trondheim133
    133 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Trondheim2
    2 (Low) UV index
  • 12°C sea temperature in September in Trondheim12
    12°C sea temperature

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The September weather guide for Norway (Trondheim) 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 Trondheim in September?

Daytime temperatures usually reach 12°C in Trondheim in September, falling to 6°C at night.

How sunny is it in Trondheim in September?

There are normally 3 hours of bright sunshine each day in Trondheim in September - that's 26% of daylight hours.

How warm is the sea around Trondheim in September?

The average sea temperature around Trondheim in September is 12°C.

Does it rain in Trondheim in September?

There are usually 24 days with some rain in Trondheim in September and the average monthly rainfall is 133mm.

Trondheim September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:04 19:31
Monday, 15th September 2025 05:43 18:43
Tuesday, 30th September 2025 06:24 17:51

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