Mariehamn weather in May 2025

Expect 12°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Mariehamn in May. Check more long-term weather averages for Mariehamn in May before you book your next holiday to Finland in 2025/2026.

  • 12°C maximum daytime temperature in May in Mariehamn12
    12°C max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in May in Mariehamn10
    10 days with some rainfall
  • 4°C minimum night-time temperature in May in Mariehamn4
    4°C min night temperature
  • 17 hours of daylight per day in May in Mariehamn17
    17 hours of daylight per day
  • No heat & humidity in May in Mariehamn0
    No heat & humidity
  • 27 mm monthly rainfall in May in Mariehamn27
    27 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in May in Mariehamn4
    4 (Moderate) UV index
  • 5°C sea temperature in May in Mariehamn5
    5°C sea temperature

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The May 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 warm is it in Mariehamn in May?

Daytime temperatures usually reach 12°C in Mariehamn in May, falling to 4°C at night.

How sunny is it in Mariehamn in May?

There are normally 8 hours of bright sunshine each day in Mariehamn in May - that's 45% of daylight hours.

Is the sea cold around Mariehamn in May?

The average sea temperature around Mariehamn in May is 5°C.

Does it rain in Mariehamn in May?

There are usually 10 days with some rain in Mariehamn in May and the average monthly rainfall is 27mm.

Mariehamn May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:37 20:39
Friday, 16th May 2025 03:59 21:16
Saturday, 31st May 2025 03:30 21:47

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