Mariehamn weather in August 2025

Expect 18°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Mariehamn in August. Check more long-term weather averages for Mariehamn in August before you book your next holiday to Finland in 2025/2026.

  • 18°C maximum daytime temperature in August in Mariehamn18
    18°C max day temperature
  • 6 hours of sunshine per day
  • 14 days with some rainfall in August in Mariehamn14
    14 days with some rainfall
  • 11°C minimum night-time temperature in August in Mariehamn11
    11°C min night temperature
  • 16 hours of daylight per day in August in Mariehamn16
    16 hours of daylight per day
  • No heat & humidity in August in Mariehamn0
    No heat & humidity
  • 64 mm monthly rainfall in August in Mariehamn64
    64 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in August in Mariehamn4
    4 (Moderate) UV index
  • 17°C sea temperature in August in Mariehamn17
    17°C sea temperature

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The August weather guide for Finland (Mariehamn) 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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How hot is it in Mariehamn in August?

Daytime temperatures usually reach 18°C in Mariehamn in August, falling to 11°C at night.

How sunny is it in Mariehamn in August?

There are normally 6 hours of bright sunshine each day in Mariehamn in August - that's 39% of daylight hours.

How warm is the sea around Mariehamn in August?

The average sea temperature around Mariehamn in August is 17°C.

Does it rain in Mariehamn in August?

There are usually 14 days with some rain in Mariehamn in August and the average monthly rainfall is 64mm.

Mariehamn August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:21 21:11
Saturday, 16th August 2025 04:57 20:31
Sunday, 31st August 2025 05:33 19:47

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