Average sea water temperature in December:
+37.3°F
| Minimum sea water temperature in December: | 43.0°F |
| Maximum sea water temperature in December: | 31.8°F |
Daily sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 39.3°F. The highest and lowest sea temperatures during the month were 42.1°F and 36.9°F.
Monthly sea water temperature in Kotka, °F
Which Finland resorts have warmest sea in December?
| Place name | December 2025 | December 2024 |
|---|---|---|
| Espoo | 40.1°F | 38.5°F |
| Vantaa | 39.9°F | 38.2°F |
| Helsinki | 39.8°F | 38.2°F |
| Kotka | 39.3°F | 38.1°F |
| Turku | 38.9°F | 36.7°F |
| Koli National Park | 38.7°F | 36.7°F |
| Porvoo | 38.2°F | 36.5°F |
| Imatra | 38.2°F | 37.0°F |
| Juvaskyla | 37.7°F | 35.9°F |
| Pori | 37.5°F | 35.2°F |
| Lahti | 37.1°F | 35.3°F |
| Savolinna | 36.7°F | 35.6°F |
| Lappeenranta | 36.3°F | 35.4°F |
| Saariselka | 34.5°F | 33.8°F |
| Oulu | 34.4°F | 30.9°F |
| Vaasa | 34.4°F | 32.5°F |
| Seinajoki | 33.0°F | 31.6°F |
| Kemi | 32.2°F | 31.7°F |
Best time for vacation in Kotka
Kotka on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Kotka
Local time: 04:40
December 24, wednesday
0600
30°F
SE
16 mph
16 mph
0900
30°F
SE
14 mph
14 mph
1200
30°F
SE
12 mph
12 mph
1500
32°F
SE
11 mph
11 mph
1800
32°F
SE
9 mph
9 mph
2100
32°F
E
9 mph
9 mph
December 25, thursday
0000
32°F
E
11 mph
11 mph
0300
32°F
E
12 mph
12 mph
