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Weather & Climate in Naantali, Finland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Naantali has a cool climate with an average annual temperature of 42°F (5°C). Winters average 25°F in January while summers reach 62°F in July. The area gets 289 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 25.9 inches (drier than the 38-inch national average). The area receives 10.3 inches of snow annually. The city sits at an elevation of 30 feet.
Temperature
25°F Jan (-4°C)
62°F Jul (17°C)
| Annual Average | 41.7°F |
| 23% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 289 days/yr |
Geography
| Elevation | 30 ft (9 m) |
| Area | 280.8 sq mi (727.2 km²) |
| Population Density | 72/sq mi |
| Coordinates | 60.4674°N, 22.0243°W |
| Timezone | Europe/Helsinki |
Precipitation & Snow
Air Quality
Earthquake History
8 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 | 87 km | 0 km |
| May 12, 2005 | 29 km SSE of Hanko, Finland | M2.7 | 116 km | 0 km |
| May 12, 2005 | 28 km SSE of Hanko, Finland | M2.7 | 116 km | 0 km |
| May 12, 2005 | 28 km SE of Hanko, Finland | M2.7 | 115 km | 0 km |
| May 24, 1995 | 8 km ENE of Nagu, Finland | M2.7 | 28 km | 10 km |
| Mar 9, 2005 | Baltic Sea | M2.6 | 87 km | 0 km |
| Mar 9, 2005 | 30 km SSW of Dragsfjärd, Finland | M2.6 | 75 km | 0 km |
| Mar 9, 2005 | 49 km SSW of Dragsfjärd, Finland | M2.5 | 89 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 2.0 in | |
| February | 23°F (-5°C) | 1.4 in | Coldest |
| March | 29°F (-2°C) | 1.6 in | |
| April | 38°F (3°C) | 1.5 in | |
| May | 49°F (9°C) | 1.3 in | Driest |
| June | 58°F (14°C) | 1.8 in | |
| July | 62°F (17°C) | 2.8 in | Warmest |
| August | 60°F (16°C) | 2.8 in | |
| September | 51°F (11°C) | 2.6 in | |
| October | 43°F (6°C) | 2.8 in | |
| November | 35°F (2°C) | 2.9 in | Wettest |
| December | 29°F (-2°C) | 2.5 in |
Naantali has a seasonal temperature swing of 39°F / from 23°F in February to 62°F in July. Total annual precipitation is 26.0 inches, with November being the wettest month (2.9") and May the driest (1.3").