Swimming in Kotka in september 2025: Average sea temperature in september and tide times in september 2025
Average sea temperature in Kotka in september 2025.
In september, according to seasonal norms, the sea temperature in Kotka is:
Minimum: 53°F
Average: 59°F
Maximum: 66°F
Other useful seasonal weather averages in september:
- Outside temperature: 54°F to 59°F
- Most common weather: "Clear/Sunny"
- The wind blows at 6.8mph
- It rains a total of 4.5in, over 7 day(s).
Should we swim in Kotka in september?
No... The water temperature in Kotka in september is freezing
You won't be able to swim in Kotka in september! The water temperature is freezing, reaching as low as 53°F (and only 66°F at best)! Our advice: if you are going to Kotka this month, plan to sightsee and forget the beach!
Note also that in september, the climate is tolerable with an average outside temperature of 57°F, 4.5in of precipitation (over 7 days) and 82.62 % humidity.
Water and normal seasonal temperatures in Kotka in september
| September | |||
| Average sea temperature | 59°F | ||
| Minimum sea temperature | 53°F | ||
| Maximum sea temperature | 66°F | ||
| Average outside temperature | 58°F | ||
| Maximum outside temperature | 59°F | ||
| Minimum outside temperature | 56°F | ||
| Wind speed | 14.3mph | ||
| Wind temperature | 52°F | ||
| Precipitation | 4.5in | ||
| Number of days of rain | 7 jour(s) (23%) | ||
| Humidity | 83% | ||
| Visibility in kilometers | 9.36km | ||
| Cloud cover | 48% | ||
| Our opinion | freezing swimming |
Chart of the tides in september 2025
Tide times in september 2025 in Kotka
Swim elsewhere in Finland in september
| City | Average T° | Min. T° | Max. T° | Our opinion | Helsinki in september | 60°F | 67°F | cold swimming | Åland in september | 50°F | 69°F | freezing swimming | Kalajoki in september | 55°F | 61°F | freezing swimming | Oulu in september | 55°F | 62°F | freezing swimming | Turku in september | 51°F | 69°F | freezing swimming | Vaasa in september | 55°F | 62°F | freezing swimming |