Weather in Mariehamn in January 2025
Average weather
Average temperature in Mariehamn in January
Going from a maximum of +6°C during the day to a minimum of -8°C during the night, the temperature in January averages around +2°C.
The average maximum temperature goes down 7% by the end of the month, compared with the beginning of the month, from +4°C to +3°C.
Is Mariehamn warm or cold in January?
Mariehamn is typically cool in January.
Maximum temperatures go down compared to the previous month from +2°C to 0°C. The minimum temperature also goes down from -1°C to -3°C.
Pack a sweater and a jacket as there will be cooler temperatures.
January is one of the coolest months in Mariehamn, here is the comparison with other months:
Climate in Mariehamn in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +2°C | 0°C | -1°C | ||||
| Min. temperature | ||||||
| -15°C | -28°C | -23°C | ||||
| Max. temperature | ||||||
| +11°C | +9°C | +10°C | ||||
| Rainfall | ||||||
| 28 mm | 16 mm | 7 mm | ||||
| Wind | ||||||
| 7 m/s | 7 m/s | 6 m/s | ||||
| Humidity | ||||||
| 82% | 83% | 84% | ||||
| Air pressure | ||||||
| 1008 HPa | 1009 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 1 | 1 | 2 | ||||
| Cloudy days | ||||||
| 10 | 12 | 14 | ||||
| Rainy days | ||||||
| 8 | 4 | 2 | ||||
| Snowy days | ||||||
| 12 | 13 | 10 | ||||
January weather is still as ok as in December. It’s getting colder in January. From +2°C in the day, the average maximum temperature lowers to 0°C. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 28 mm to 16 mm. Humidity rises from 82% to 83%. The average wind speed doesn’t change much during January, staying around 7 m/s. The amount of sunny days stay about the same, averaging 1 sunny days during the month.
February brings much the same weather, it remains ok.
Wind
The average wind speed is 8 m/s getting up to 15 m/s which is quite strong. The wind will cause branches to move and ground debris to fly around.
The average wind speed in Mariehamn is gradually increasing during January, going from 2 m/s to 9 m/s over the course of the month.
Rain
Snow
January is one of the snowiest months in Mariehamn.
Here’s how January is compared with other months in the amount of snow, total mm:
How was the weather last January in Mariehamn?
Climate Change over Years
The climate in Mariehamn in January has not changed much over the last 43 years.
The average temperature was the lowest in 1987 (+5°C) and the highest in 2020 (+11°C). The driest year was 2018 with only 269 mm of rainfall, and the wettest year was 2020 with 612 mm.
FAQ
Is January a good time to visit Mariehamn?
Can you sunbathe in Mariehamn in January?
Is Mariehamn rainy in January?
Is it sunny in Mariehamn in January?
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.