Iceland weather in August 2025

Expect 12°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Iceland in August. Check more long-term weather averages for Iceland in August before you book your next holiday to Iceland in 2025/2026.

  • 12°C maximum daytime temperature in August in Iceland (Reykjavik)12
    12°C max day temperature
  • 5 hours of sunshine per day
  • 18 days with some rainfall in August in Iceland (Reykjavik)18
    18 days with some rainfall
  • 7°C minimum night-time temperature in August in Iceland (Reykjavik)7
    7°C min night temperature
  • 16 hours of daylight per day in August in Iceland (Reykjavik)16
    16 hours of daylight per day
  • No heat & humidity in August in Iceland (Reykjavik)0
    No heat & humidity
  • 83 mm monthly rainfall in August in Iceland (Reykjavik)83
    83 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in August in Iceland (Reykjavik)3
    3 (Moderate) UV index
  • 11°C sea temperature in August in Iceland (Reykjavik)11
    11°C sea temperature

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The August 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 August. 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 August?

Daytime temperatures usually reach 12°C in Reykjavik, Iceland in August, falling to 7°C at night.

How sunny is it in Iceland in August?

There are normally 5 hours of bright sunshine each day in Reykjavik, Iceland in August - that's 29% of daylight hours.

Is the sea cold around Iceland in August?

The average sea temperature around Reykjavik, Iceland in August is 11°C.

Does it rain in Iceland in August?

There are usually 18 days with some rain in Reykjavik, Iceland in August and the average monthly rainfall is 83mm.

Iceland August sunrise & sunset times

Browse the sunrise and sunset times for Iceland in August 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
Friday, 1st August 2025 04:35 22:30
Saturday, 16th August 2025 05:22 21:39
Sunday, 31st August 2025 06:08 20:46

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