Weather in Mariehamn in October 2025
Average weather
Average temperature in Mariehamn in October
The temperature in October is +46°F on average, with a range between a maximum of +57°F during the day and a minimum of +34°F at night.
The average maximum temperature goes down 38% by the end of the month, compared with the beginning of the month, from +55°F to +46°F.
Is Mariehamn warm or cold in October?
Mariehamn is typically chill in October.
Maximum temperatures go down compared to the previous month from +57°F to +48°F. The minimum temperature also goes down from +50°F to +43°F.
Pack a jumper and a jacket as there will be cooler temperatures.
Take a look at how October is compared to other months in Mariehamn:
Climate in Mariehamn in October
| September | October | November | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +57°F | +48°F | +41°F | ||||
| Min. temperature | ||||||
| +34°F | +21°F | +12°F | ||||
| Max. temperature | ||||||
| +75°F | +63°F | +61°F | ||||
| Rainfall | ||||||
| 55 mm | 64 mm | 49 mm | ||||
| Wind | ||||||
| 6 m/s | 6 m/s | 7 m/s | ||||
| Humidity | ||||||
| 81% | 81% | 82% | ||||
| Air pressure | ||||||
| 1012 HPa | 1011 HPa | 1010 HPa | ||||
| Sunny days | ||||||
| 4 | 3 | 1 | ||||
| Cloudy days | ||||||
| 10 | 11 | 9 | ||||
| Rainy days | ||||||
| 15 | 17 | 14 | ||||
| Snowy days | ||||||
| 0 | 1 | 6 | ||||
October weather is still as ok as in September. It’s getting colder in October. From +57°F in the day, the average maximum temperature lowers to +48°F. Prepare for more rain. Average rainfall goes from 55 mm to 64 mm. Humidity levels don’t change as the month goes on, averaging around 81%. The average wind speed doesn’t change much during October, staying around 6 m/s. The days becoming less sunny, going from 4 sunny days in September to 3 in October.
November brings much the same weather, it remains ok.
Wind
The average wind speed is 5 m/s getting up to 10 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Mariehamn is gradually increasing during October, going from 4 m/s to 4 m/s over the course of the month.
Rain
How was the weather last October in Mariehamn?
Climate Change Over the Years
The climate in Mariehamn in October has not changed that much over the last 43 years.
The average temperature was the lowest in 1987 (+41°F) and the highest in 2020 (+52°F). The driest year was 2018 with only 269 mm of rainfall, and the wettest year was 2020 with 612 mm.
FAQ
Is October a good time to visit Mariehamn?
Can you sunbathe in Mariehamn in October?
Is Mariehamn rainy in October?
Is it sunny in Mariehamn in October?
Monthly weather in Mariehamn
Source of the data
For this page, we’ve looked at the typical weather in Mariehamn, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.