Reykjavik weather in September 2025

Expect 9°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Reykjavik in September based on long-term weather averages. There is usually 18 days with some rainfall and 86 mm of average monthly rainfall in September.

  • 9°C maximum daytime temperature in September in Reykjavik9
    9°C max day temperature
  • 4 hours of sunshine per day
  • 18 days with some rainfall in September in Reykjavik18
    18 days with some rainfall
  • 4°C minimum night-time temperature in September in Reykjavik4
    4°C min night temperature
  • 13 hours of daylight per day in September in Reykjavik13
    13 hours of daylight per day
  • No heat & humidity in September in Reykjavik0
    No heat & humidity
  • 86 mm monthly rainfall in September in Reykjavik86
    86 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Reykjavik2
    2 (Low) UV index
  • 10°C sea temperature in September in Reykjavik10
    10°C sea temperature

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The September weather guide for Iceland (Reykjavik) 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 Iceland

How warm is it in Reykjavik in September?

Daytime temperatures usually reach 9°C in Reykjavik in September, falling to 4°C at night.

How sunny is it in Reykjavik in September?

There are normally 4 hours of bright sunshine each day in Reykjavik in September - that's 29% of daylight hours.

Is the sea cold around Reykjavik in September?

The average sea temperature around Reykjavik in September is 10°C.

Does it rain in Reykjavik in September?

There are usually 18 days with some rain in Reykjavik in September and the average monthly rainfall is 86mm.

Reykjavik September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:11 20:42
Monday, 15th September 2025 06:51 19:53
Tuesday, 30th September 2025 07:34 18:59

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