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Weather & Climate in Mariehamn, Aland Islands
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mariehamn has a cool climate with an average annual temperature of 42°F (6°C). Winters average 28°F in January while summers reach 60°F in July. The area gets 294 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 22.9 inches (drier than the 38-inch national average). The area receives 6.2 inches of snow annually. The city sits at an elevation of 36 feet.
Temperature
28°F Jan (-2°C)
60°F Jul (16°C)
| Annual Average | 42.3°F |
| 22% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 60°F (16°C) |
| Sunny Days | 294 days/yr |
Geography
| Elevation | 36 ft (11 m) |
| Area | 7.7 sq mi (19.9 km²) |
| Population Density | 1,391/sq mi |
| Coordinates | 60.0973°N, 19.9348°W |
| Timezone | Europe/Mariehamn |
Precipitation & Snow
Air Quality
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.8.
| Mar 9, 2005 | 56 km ESE of Kökar, Aland Islands | M2.8 | 114 km | 0 km |
| Apr 5, 1995 | 9 km N of Åkersberga, Sweden | M2.7 | 108 km | 15 km |
| Mar 30, 1995 | 11 km SSW of Norrtälje, Sweden | M2.7 | 87 km | 10 km |
| May 24, 1995 | 8 km ENE of Nagu, Finland | M2.7 | 118 km | 10 km |
| Apr 3, 1995 | 14 km NE of Åkersberga, Sweden | M2.6 | 101 km | 10 km |
| Mar 9, 2005 | Baltic Sea | M2.6 | 137 km | 0 km |
| Mar 9, 2005 | 30 km SSW of Dragsfjärd, Finland | M2.6 | 136 km | 0 km |
| May 12, 2005 | 6 km E of Dalarö, Sweden | M2.5 | 133 km | 0 km |
| Apr 5, 1995 | 6 km NNE of Åkersberga, Sweden | M2.5 | 109 km | 10 km |
| Mar 9, 2005 | 49 km SSW of Dragsfjärd, Finland | M2.5 | 131 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 1.7 in | |
| February | 26°F (-3°C) | 1.1 in | Coldest |
| March | 30°F (-1°C) | 1.3 in | |
| April | 37°F (3°C) | 1.2 in | |
| May | 47°F (8°C) | 1.1 in | Driest |
| June | 55°F (13°C) | 1.8 in | |
| July | 60°F (16°C) | 2.3 in | Warmest |
| August | 60°F (15°C) | 2.6 in | |
| September | 52°F (11°C) | 2.4 in | |
| October | 44°F (7°C) | 2.6 in | |
| November | 37°F (3°C) | 2.7 in | Wettest |
| December | 32°F (-0°C) | 2.1 in |
Mariehamn has a seasonal temperature swing of 34°F / from 26°F in February to 60°F in July. Total annual precipitation is 22.9 inches, with November being the wettest month (2.7") and May the driest (1.1").