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Weather & Climate in Siuntio, Finland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Siuntio has a cool climate with an average annual temperature of 41°F (5°C). Winters average 23°F in January while summers reach 62°F in July. The area gets 291 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 25.1 inches (drier than the 38-inch national average). The area receives 9.6 inches of snow annually. The city sits at an elevation of 131 feet.
Temperature
23°F Jan (-5°C)
62°F Jul (17°C)
| Annual Average | 41.0°F |
| 24% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 291 days/yr |
Geography
| Elevation | 131 ft (40 m) |
| Area | 148.8 sq mi (385.4 km²) |
| Population Density | 42/sq mi |
| Coordinates | 60.1386°N, 24.2272°W |
| Timezone | Europe/Helsinki |
Precipitation & Snow
Air Quality
Earthquake History
9 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 | 144 km | 0 km |
| May 12, 2005 | 29 km SSE of Hanko, Finland | M2.7 | 86 km | 0 km |
| May 12, 2005 | 28 km SSE of Hanko, Finland | M2.7 | 82 km | 0 km |
| May 12, 2005 | 28 km SE of Hanko, Finland | M2.7 | 72 km | 0 km |
| May 24, 1995 | 8 km ENE of Nagu, Finland | M2.7 | 121 km | 10 km |
| Mar 9, 2005 | Baltic Sea | M2.6 | 121 km | 0 km |
| Mar 9, 2005 | 30 km SSW of Dragsfjärd, Finland | M2.6 | 113 km | 0 km |
| Mar 19, 2011 | Finland | M2.6 | 76 km | 3 km |
| Mar 9, 2005 | 49 km SSW of Dragsfjärd, Finland | M2.5 | 129 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.9 in | |
| February | 22°F (-6°C) | 1.3 in | Coldest |
| March | 28°F (-2°C) | 1.5 in | |
| April | 37°F (3°C) | 1.4 in | |
| May | 49°F (10°C) | 1.2 in | Driest |
| June | 58°F (14°C) | 1.8 in | |
| July | 62°F (17°C) | 2.6 in | Warmest |
| August | 60°F (15°C) | 3.0 in | Wettest |
| September | 51°F (11°C) | 2.6 in | |
| October | 43°F (6°C) | 2.8 in | |
| November | 34°F (1°C) | 2.7 in | |
| December | 27°F (-3°C) | 2.2 in |
Siuntio has a seasonal temperature swing of 40°F / from 22°F in February to 62°F in July. Total annual precipitation is 25.1 inches, with August being the wettest month (3.0") and May the driest (1.2").