Svalbard weather in September 2025

Expect daytime maximum temperatures of 34°F in Svalbard in September based on long-term weather averages. There are 3 hours of sunshine per day on average with 12 days with some rainfall, which might fall as snow.

  • 34°F maximum daytime temperature in September in Svalbard (Longyearbyen)34
    34°F max day temperature
  • 3 hours of sunshine per day
  • 12 days with some rainfall in September in Svalbard (Longyearbyen)12
    12 days with some rainfall
  • 27°F minimum night-time temperature in September in Svalbard (Longyearbyen)27
    27°F min night temperature
  • 14 hours of daylight per day in September in Svalbard (Longyearbyen)14
    14 hours of daylight per day
  • No heat & humidity in September in Svalbard (Longyearbyen)0
    No heat & humidity
  • 1.0 inches monthly rainfall in September in Svalbard (Longyearbyen)1.0
    1.0 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in September in Svalbard (Longyearbyen)1
    1 (Low) UV index
  • 30°F sea temperature in September in Svalbard (Longyearbyen)30
    30°F sea temperature

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The September weather guide for Svalbard, represented by Longyearbyen, (Longyearbyen) 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 cold is it in Svalbard in September?

Daytime temperatures usually reach 34°F in Longyearbyen, Svalbard in September, falling to 27°F at night.

How sunny is it in Svalbard in September?

There are normally 3 hours of bright sunshine each day in Longyearbyen, Svalbard in September - that's 19% of daylight hours.

How warm is the sea around Svalbard in September?

The average sea temperature around Longyearbyen, Svalbard in September is 30°F.

Does it rain in Svalbard in September?

There are usually 12 days with some rain in Longyearbyen, Svalbard in September and the average monthly rainfall is 1.0 inches. Rain may fall as snow in this month.

Svalbard September sunrise & sunset times

Browse the sunrise and sunset times for Svalbard in September 2025. Select a month to view Svalbard sunrise and sunset times for the next 12 months. The Svalbard sunrise and sunset times shown below are for Longyearbyen.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 02:37 21:09
Monday, 15th September 2025 04:38 19:02
Tuesday, 30th September 2025 06:27 17:04

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