Average sea water temperature in October:
+50.3°F
| Minimum sea water temperature in October: | 58.5°F |
| Maximum sea water temperature in October: | 43.0°F |
Daily sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 50.5°F. The highest and lowest sea temperatures during the month were 54.9°F and 46.8°F.
sea water
temperature
temperature
| Helsinki |
monthly
weather
weather
| Helsinki |
current
weather
weather
| Helsinki |
14 days
forecast
forecast
| Helsinki |
Monthly sea water temperature in Helsinki, °F
Which Finland resorts have warmest sea in October?
| Place name | October 2025 | October 2024 |
|---|---|---|
| Turku | 52.0°F | 52.1°F |
| Kotka | 51.4°F | 54.2°F |
| Lahti | 51.3°F | 51.7°F |
| Juvaskyla | 50.8°F | 50.8°F |
| Vantaa | 50.7°F | 53.3°F |
| Helsinki | 50.5°F | 53.1°F |
| Espoo | 50.5°F | 52.9°F |
| Savolinna | 50.3°F | 51.6°F |
| Imatra | 49.5°F | 51.8°F |
| Lappeenranta | 49.3°F | 51.6°F |
| Porvoo | 48.9°F | 52.3°F |
| Koli National Park | 48.8°F | 50.4°F |
| Pori | 48.1°F | 48.9°F |
| Vaasa | 46.2°F | 47.1°F |
| Seinajoki | 46.0°F | 47.3°F |
| Saariselka | 45.7°F | 45.7°F |
| Kemi | 45.4°F | 44.3°F |
| Oulu | 44.9°F | 44.4°F |
Best time for vacation in Helsinki
Helsinki on a weather map
Places in Finland:
Name
°F
24 Hours Forecast
Helsinki
Local time: 16:42
December 17, wednesday
1800
43°F
NE
20 mph
20 mph
2100
43°F
E
19 mph
19 mph
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
