Mariehamn weather in October 2025

Expect 48°F daytime maximum temperatures in the shade with on average 2 hours of sunshine per day in Mariehamn in October. Check more long-term weather averages for Mariehamn in October before you book your next holiday to Finland in 2025/2026.

  • 48°F maximum daytime temperature in October in Mariehamn48
    48°F max day temperature
  • 2 hours of sunshine per day
  • 16 days with some rainfall in October in Mariehamn16
    16 days with some rainfall
  • 39°F minimum night-time temperature in October in Mariehamn39
    39°F min night temperature
  • 10 hours of daylight per day in October in Mariehamn10
    10 hours of daylight per day
  • No heat & humidity in October in Mariehamn0
    No heat & humidity
  • 2.1 inches monthly rainfall in October in Mariehamn2.1
    2.1 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in October in Mariehamn1
    1 (Low) UV index
  • 48°F sea temperature in October in Mariehamn48
    48°F sea temperature

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The October 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 October?

Daytime temperatures usually reach 48°F in Mariehamn in October, falling to 39°F at night.

How sunny is it in Mariehamn in October?

There are normally 2 hours of bright sunshine each day in Mariehamn in October - that's 24% of daylight hours.

How warm is the sea around Mariehamn in October?

The average sea temperature around Mariehamn in October is 48°F.

Does it rain in Mariehamn in October?

There are usually 16 days with some rain in Mariehamn in October and the average monthly rainfall is 2.1 inches.

Mariehamn October sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st October 2025 06:46 18:12
Thursday, 16th October 2025 07:23 17:28
Friday, 31st October 2025 08:01 16:46

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