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 39.2°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 | 39.9°F | 38.5°F |
| Vantaa | 39.7°F | 38.2°F |
| Helsinki | 39.6°F | 38.2°F |
| Kotka | 39.2°F | 38.1°F |
| Turku | 38.8°F | 36.7°F |
| Koli National Park | 38.2°F | 36.7°F |
| Porvoo | 37.9°F | 36.5°F |
| Imatra | 37.8°F | 37.0°F |
| Pori | 37.4°F | 35.2°F |
| Juvaskyla | 37.2°F | 35.9°F |
| Lahti | 36.7°F | 35.3°F |
| Savolinna | 36.4°F | 35.6°F |
| Lappeenranta | 36.0°F | 35.4°F |
| Vaasa | 34.2°F | 32.5°F |
| Oulu | 34.2°F | 30.9°F |
| Saariselka | 34.2°F | 33.8°F |
| Seinajoki | 33.1°F | 31.6°F |
| Kemi | 32.0°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: 01:56
December 28, sunday
0300
36°F
S
22 mph
22 mph
0600
34°F
S
28 mph
28 mph
0900
30°F
S
26 mph
26 mph
1200
28°F
S
22 mph
22 mph
1500
28°F
SE
20 mph
20 mph
1800
28°F
SE
12 mph
12 mph
2100
30°F
E
8 mph
8 mph
December 29, monday
0000
32°F
E
9 mph
9 mph
