Mariehamn weather in May 2025

Expect 54°F 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.

  • 54°F maximum daytime temperature in May in Mariehamn54
    54°F max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in May in Mariehamn10
    10 days with some rainfall
  • 39°F minimum night-time temperature in May in Mariehamn39
    39°F 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
  • 1.1 inches monthly rainfall in May in Mariehamn1.1
    1.1 inches of monthly rainfall
  • UV (maximum) index 4 (Moderate) in May in Mariehamn4
    4 (Moderate) UV index
  • 41°F sea temperature in May in Mariehamn41
    41°F 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)  |  Imperial (°F)

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How warm is it in Mariehamn in May?

Daytime temperatures usually reach 54°F in Mariehamn in May, falling to 39°F 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.

How warm is the sea around Mariehamn in May?

The average sea temperature around Mariehamn in May is 41°F.

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 1.1 inches.

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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