Mariehamn weather in January 2026

Expect daytime maximum temperatures of 30°F in Mariehamn, Finland in January based on long-term weather averages. There is 1 hour of sunshine per day on average with 20 days with some rainfall, which might fall as snow.

  • 30°F maximum daytime temperature in January in Mariehamn30
    30°F max day temperature
  • 1 hour of sunshine per day
  • 20 days with some rainfall in January in Mariehamn20
    20 days with some rainfall
  • 19°F minimum night-time temperature in January in Mariehamn19
    19°F min night temperature
  • 7 hours of daylight per day in January in Mariehamn7
    7 hours of daylight per day
  • No heat & humidity in January in Mariehamn0
    No heat & humidity
  • 1.4 inches monthly rainfall in January in Mariehamn1.4
    1.4 inches of monthly rainfall
  • No UV (maximum) index in January in Mariehamn0
    No UV (Maximum) Index UV index
  • 36°F sea temperature in January in Mariehamn36
    36°F sea temperature

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The January 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 cold is it in Mariehamn in January?

Daytime temperatures usually reach 30°F in Mariehamn in January, falling to 19°F at night.

How sunny is it in Mariehamn in January?

There are normally 1 hour of bright sunshine each day in Mariehamn in January - that's 9% of daylight hours.

How warm is the sea around Mariehamn in January?

The average sea temperature around Mariehamn in January is 36°F.

Does it rain in Mariehamn in January?

There are usually 20 days with some rain in Mariehamn in January and the average monthly rainfall is 1.4 inches. Rain may fall as snow in this month.

Mariehamn January sunrise & sunset times

Browse the sunrise and sunset times for Mariehamn in January 2026. Select a month to view Mariehamn sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 09:43 15:45
Friday, 16th January 2026 09:27 16:13
Saturday, 31st January 2026 08:57 16:51

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