Iceland weather in September 2025

Expect daytime maximum temperatures of 9°C in Iceland in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 18 days with some rainfall and typically 86 mm of rainfall in the month.

  • 9°C maximum daytime temperature in September in Iceland (Reykjavik)9
    9°C max day temperature
  • 4 hours of sunshine per day
  • 18 days with some rainfall in September in Iceland (Reykjavik)18
    18 days with some rainfall
  • 4°C minimum night-time temperature in September in Iceland (Reykjavik)4
    4°C min night temperature
  • 13 hours of daylight per day in September in Iceland (Reykjavik)13
    13 hours of daylight per day
  • No heat & humidity in September in Iceland (Reykjavik)0
    No heat & humidity
  • 86 mm monthly rainfall in September in Iceland (Reykjavik)86
    86 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Iceland (Reykjavik)2
    2 (Low) UV index
  • 10°C sea temperature in September in Iceland (Reykjavik)10
    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.

Top Iceland destinations

Below are average maximum temperatures at popular countries, regions and places in Iceland in September. Select a holiday destination to see more weather parameters.

All Iceland destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Iceland

How warm is it in Iceland in September?

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

How sunny is it in Iceland in September?

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

Is the sea cold around Iceland in September?

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

Does it rain in Iceland in September?

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

Iceland September sunrise & sunset times

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

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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