Mariehamn weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: June – August
What is the weather like in Mariehamn in January?
In January, Mariehamn is freezing cold: daytime highs average 1 °C, and nights often drop below freezing (−2 °C). The sea averages 2.4 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Precipitation, often as snow, falls on about 9 days, totalling 39 mm. Snow falls on about 5 days. It is often windy, with gusts of around 28 km/h. All in all, January is not an ideal month for a holiday in Mariehamn.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 14 | 19 | 22 |
| Day | 3° | 1° | 0° |
| Night | 0° | −2° | −3° |
| Sea | 4° | 2° | 1° |
| Sun | 1 h | 1 h | 2 h |
| Rain days | 11 | 9 | 8 |
More details for January
- Daylight
- 6 h 38 min09:30 – 16:08
- UV index
- 0 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 28 km/haverage daily peakAll months
- Cloud cover
- 79 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 5 days1 cm or more of fresh snowAll months
- Time zone
- UTC+2Europe/Mariehamn
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %64 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- Warm jacket
- Hat, scarf & gloves
- Rain jacket or umbrella
- Windproof jacket
Mariehamn in January: quick answers
Is Mariehamn hot in January?
No. In January, Mariehamn is freezing cold: daytime highs average 1 °C and nights drop to about −2 °C.
Can you swim in Mariehamn in January?
Only if you don't mind cold water: in January the sea averages just 2.4 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Mariehamn in January?
Rain is frequent, with about 9 rainy days and 39 mm in total.
Mariehamn month by month
The whole year in MariehamnAll destinations: Åland IslandsWhere to go in JanuarySea temperature in January
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences