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Iceland weather in September 2025
Expect 9°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Iceland in September. Check more long-term weather averages for Iceland in September before you book your next holiday to Iceland in 2025/2026.
- 99°C max day temperature
- 4 hours of sunshine per day
- 1818 days with some rainfall
- 44°C min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 8686 mm of monthly rainfall
- 22 (Low) UV index
- 1010°C sea temperature
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Recommended for Iceland
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)
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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