Mariehamn weather in October 2025

Expect 9°C 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.

  • 9°C maximum daytime temperature in October in Mariehamn9
    9°C max day temperature
  • 2 hours of sunshine per day
  • 16 days with some rainfall in October in Mariehamn16
    16 days with some rainfall
  • 4°C minimum night-time temperature in October in Mariehamn4
    4°C 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
  • 53 mm monthly rainfall in October in Mariehamn53
    53 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in October in Mariehamn1
    1 (Low) UV index
  • 9°C sea temperature in October in Mariehamn9
    9°C 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 / mm)  |  Imperial (°F / inches)

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How warm is it in Mariehamn in October?

Daytime temperatures usually reach 9°C in Mariehamn in October, falling to 4°C 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.

Is the sea cold around Mariehamn in October?

The average sea temperature around Mariehamn in October is 9°C.

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 53mm.

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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