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 39.9°F. The highest and lowest sea temperatures during the month were 41.9°F and 36.7°F.
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| Helsinki |
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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 | 40.2°F | 38.5°F |
| Vantaa | 39.9°F | 38.2°F |
| Helsinki | 39.9°F | 38.2°F |
| Kotka | 39.4°F | 38.1°F |
| Turku | 39.0°F | 36.7°F |
| Koli National Park | 38.8°F | 36.7°F |
| Porvoo | 38.4°F | 36.5°F |
| Imatra | 38.4°F | 37.0°F |
| Juvaskyla | 37.8°F | 35.9°F |
| Pori | 37.5°F | 35.2°F |
| Lahti | 37.3°F | 35.3°F |
| Savolinna | 36.8°F | 35.6°F |
| Lappeenranta | 36.5°F | 35.4°F |
| Saariselka | 34.6°F | 33.8°F |
| Oulu | 34.5°F | 30.9°F |
| Vaasa | 34.5°F | 32.5°F |
| Seinajoki | 33.0°F | 31.6°F |
| Kemi | 32.2°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: 13:24
December 21, sunday
1500
37°F
SE
12 mph
12 mph
1800
37°F
SE
12 mph
12 mph
2100
36°F
SE
11 mph
11 mph
December 22, monday
0000
34°F
SE
9 mph
9 mph
0300
34°F
SE
7 mph
7 mph
0600
34°F
S
7 mph
7 mph
0900
32°F
S
9 mph
9 mph
1200
32°F
SW
11 mph
11 mph
