Average sea water temperature in December:
+36.5°F
| Minimum sea water temperature in December: | 40.8°F |
| Maximum sea water temperature in December: | 31.6°F |
Daily sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 37.7°F. The highest and lowest sea temperatures during the month were 40.3°F and 34.2°F.
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| Koli National Park |
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| Koli National Park |
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| Koli National Park |
14 days
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| Koli National Park |
Monthly sea water temperature in Koli National Park, °F
Which Finland resorts have warmest sea in December?
| Place name | December 2025 | December 2024 |
|---|---|---|
| Espoo | 39.7°F | 38.5°F |
| Vantaa | 39.5°F | 38.2°F |
| Helsinki | 39.5°F | 38.2°F |
| Kotka | 39.0°F | 38.1°F |
| Turku | 38.8°F | 36.7°F |
| Koli National Park | 37.7°F | 36.7°F |
| Porvoo | 37.6°F | 36.5°F |
| Imatra | 37.4°F | 37.0°F |
| Pori | 37.1°F | 35.2°F |
| Juvaskyla | 36.8°F | 35.9°F |
| Lahti | 36.4°F | 35.3°F |
| Savolinna | 36.0°F | 35.6°F |
| Lappeenranta | 35.8°F | 35.4°F |
| Oulu | 34.1°F | 30.9°F |
| Vaasa | 34.0°F | 32.5°F |
| Saariselka | 33.9°F | 33.8°F |
| Seinajoki | 33.0°F | 31.6°F |
| Kemi | 31.9°F | 31.7°F |
Best time for vacation in Koli National Park
Koli National Park on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Koli National Park
Local time: 04:28
October 12, monday
0600
34°F
W
11 mph
11 mph
0900
36°F
W
13 mph
13 mph
1200
39°F
W
14 mph
14 mph
1500
41°F
W
13 mph
13 mph
1800
37°F
W
14 mph
14 mph
2100
36°F
SW
14 mph
14 mph
October 13, tuesday
0000
34°F
SW
14 mph
14 mph
0300
34°F
SW
14 mph
14 mph
