Average sea water temperature in December:
+38.7°F
| Minimum sea water temperature in December: | 43.5°F |
| Maximum sea water temperature in December: | 33.3°F |
Daily sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 40.2°F. The highest and lowest sea temperatures during the month were 41.9°F and 36.7°F.
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14 days
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Monthly sea water temperature in Helsinki, °F
Which Finland resorts have warmest sea in December?
| Place name | December 2025 | December 2024 |
|---|---|---|
| Espoo | 40.4°F | 38.5°F |
| Vantaa | 40.2°F | 38.2°F |
| Helsinki | 40.2°F | 38.2°F |
| Kotka | 39.9°F | 38.1°F |
| Turku | 39.3°F | 36.7°F |
| Koli National Park | 39.1°F | 36.7°F |
| Porvoo | 38.7°F | 36.5°F |
| Imatra | 38.6°F | 37.0°F |
| Juvaskyla | 38.1°F | 35.9°F |
| Lahti | 37.6°F | 35.3°F |
| Pori | 37.4°F | 35.2°F |
| Savolinna | 37.1°F | 35.6°F |
| Lappeenranta | 36.9°F | 35.4°F |
| Saariselka | 34.9°F | 33.8°F |
| Oulu | 34.6°F | 30.9°F |
| Vaasa | 34.5°F | 32.5°F |
| Seinajoki | 33.4°F | 31.6°F |
| Kemi | 32.3°F | 31.7°F |
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 23:37
December 18, thursday
0000
39°F
E
15 mph
15 mph
0300
39°F
E
14 mph
14 mph
0600
37°F
E
8 mph
8 mph
0900
36°F
E
7 mph
7 mph
1200
37°F
NE
6 mph
6 mph
1500
37°F
NE
8 mph
8 mph
1800
39°F
N
10 mph
10 mph
2100
39°F
NE
13 mph
13 mph
