Swimming in Kotka in december 2025: Average sea temperature in december and tide times in december 2025
Average sea temperature in Kotka in december 2025.
In december, according to seasonal norms, the sea temperature in Kotka is:
Minimum: 31°F
Average: 39°F
Maximum: 45°F
Other useful seasonal weather averages in december:
- Outside temperature: 31°F to 35°F
- Most common weather: "Snow showers"
- The wind blows at -3.7mph
- It rains a total of 4.6in, over 9 day(s).
Should we swim in Kotka in december?
No... The water temperature in Kotka in december is freezing
You won't be able to swim in Kotka in december! The water temperature is freezing, reaching as low as 31°F (and only 45°F at best)! Our advice: if you are going to Kotka this month, plan to sightsee and forget the beach!
Note also that in december, the climate is very bad with an average outside temperature of 33°F, 4.5in of precipitation (over 9 days) and 89.75 % humidity.
Water and normal seasonal temperatures in Kotka in december
| December | |||
| Average sea temperature | 39°F | ||
| Minimum sea temperature | 31°F | ||
| Maximum sea temperature | 45°F | ||
| Average outside temperature | 34°F | ||
| Maximum outside temperature | 36°F | ||
| Minimum outside temperature | 31°F | ||
| Wind speed | 17.4mph | ||
| Wind temperature | 22°F | ||
| Precipitation | 4.6in | ||
| Number of days of rain | 9 jour(s) (27%) | ||
| Humidity | 90% | ||
| Visibility in kilometers | 6.94km | ||
| Cloud cover | 78% | ||
| Our opinion | freezing swimming |
Chart of the tides in december 2025
Tide times in december 2025 in Kotka
Swim elsewhere in Finland in december
| City | Average T° | Min. T° | Max. T° | Our opinion | Helsinki in december | 39°F | 47°F | freezing swimming | Åland in december | 35°F | 42°F | freezing swimming | Kalajoki in december | 37°F | 42°F | freezing swimming | Oulu in december | 36°F | 41°F | freezing swimming | Turku in december | 36°F | 43°F | freezing swimming | Vaasa in december | 37°F | 42°F | freezing swimming |