At this moment warmest sea in Finland was observed in the following locations: Turku, Kotka, Lahti.
You can find the full list of Finland marine locations in the table below. It shows current sea temperature values and averages for current and upcoming months.
| Place name | Current sea temp |
September 2025 | October 2025 |
|---|---|---|---|
| Turku | 60.4°F | 60.5°F | 52.0°F |
| Kotka | 59.9°F | 61.4°F | 51.4°F |
| Lahti | 59.5°F | 60.6°F | 51.3°F |
| Lappeenranta | 59.4°F | 61.2°F | 49.3°F |
| Juvaskyla | 58.5°F | 59.5°F | 50.8°F |
| Savolinna | 58.1°F | 60.1°F | 50.3°F |
| Koli National Park | 57.9°F | 59.1°F | 48.8°F |
| Helsinki | 57.7°F | 59.5°F | 50.5°F |
| Vantaa | 57.7°F | 59.5°F | 50.7°F |
| Imatra | 57.7°F | 59.4°F | 49.5°F |
| Espoo | 57.4°F | 59.3°F | 50.5°F |
| Vaasa | 57.0°F | 57.7°F | 46.2°F |
| Porvoo | 56.8°F | 59.1°F | 48.9°F |
| Seinajoki | 55.8°F | 56.7°F | 46.0°F |
| Pori | 55.4°F | 57.3°F | 48.1°F |
| Oulu | 54.7°F | 56.6°F | 44.9°F |
| Kemi | 54.3°F | 56.2°F | 45.4°F |
| Saariselka | 51.8°F | 53.1°F | 45.7°F |
Charts below show average sea water temperature for Finland resorts with the warmest sea.
You can also check other months of the year to see sea temperature of Finland resorts at that time.
Places in Finland:
Name
°F
