All Countries
Weather & Climate in Sastamala, Finland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sastamala has a cool climate with an average annual temperature of 39°F (4°C). Winters average 20°F in January while summers reach 61°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 24.8 inches (drier than the 38-inch national average). The area receives 8.6 inches of snow annually. The city sits at an elevation of 213 feet.
Temperature
20°F Jan (-7°C)
61°F Jul (16°C)
| Annual Average | 39.0°F |
| 28% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 291 days/yr |
Geography
| Elevation | 213 ft (65 m) |
| Area | 686.4 sq mi (1,777.6 km²) |
| Population Density | 36/sq mi |
| Coordinates | 61.3494°N, 22.9093°W |
| Timezone | Europe/Helsinki |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.7.
| May 24, 1995 | 8 km ENE of Nagu, Finland | M2.7 | 134 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.7 in | |
| February | 19°F (-7°C) | 1.3 in | Coldest, Driest |
| March | 27°F (-3°C) | 1.4 in | |
| April | 36°F (2°C) | 1.4 in | |
| May | 49°F (9°C) | 1.4 in | |
| June | 57°F (14°C) | 2.4 in | |
| July | 61°F (16°C) | 3.2 in | Warmest, Wettest |
| August | 57°F (14°C) | 3.0 in | |
| September | 48°F (9°C) | 2.5 in | |
| October | 39°F (4°C) | 2.3 in | |
| November | 31°F (-1°C) | 2.3 in | |
| December | 24°F (-5°C) | 1.9 in |
Sastamala has a seasonal temperature swing of 42°F / from 19°F in February to 61°F in July. Total annual precipitation is 24.8 inches, with July being the wettest month (3.2") and February the driest (1.3").