Mariehamn weather in October
Temperature, sea and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Poor
Best time to visit: June – August
What is the weather like in Mariehamn in October?
In October, Mariehamn is cold: daytime highs average 10 °C, and nights cool down to about 7 °C. The sea averages 10.0 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 10 rainy days and 52 mm in total. All in all, October is not an ideal month for a holiday in Mariehamn.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 63 | 25 | 17 |
| Day | 15° | 10° | 6° |
| Night | 12° | 7° | 4° |
| Sea | 14° | 10° | 7° |
| Sun | 6 h | 3 h | 1 h |
| Rain days | 9 | 10 | 10 |
More details for October
- Daylight
- 10 h 18 min08:17 – 18:35
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 26 km/haverage daily peakAll months
- Cloud cover
- 70 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3Europe/Mariehamn
How the score comes together
- Temperatureweight 50 %15 %
- Sunshineweight 20 %3 %
- Few rainy daysweight 30 %56 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Warm jacket
- Rain jacket or umbrella
Mariehamn in October: quick answers
Is Mariehamn hot in October?
No. In October, Mariehamn is cold: daytime highs average 10 °C and nights drop to about 7 °C.
Can you swim in Mariehamn in October?
Only if you don't mind cold water: in October the sea averages just 10.0 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Mariehamn in October?
Rain is frequent, with about 10 rainy days and 52 mm in total.
Mariehamn month by month
The whole year in MariehamnAll destinations: Åland IslandsWhere to go in OctoberSea temperature in October
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