Swimming in Helsinki in september 2025: Average sea temperature in september and tide times in september 2025
Average sea temperature in Helsinki in september 2025.
In september, according to seasonal norms, the sea temperature in Helsinki is:
Minimum: 53°F
Average: 60°F
Maximum: 67°F
Other useful seasonal weather averages in september:
- Outside temperature: 54°F to 60°F
- Most common weather: "Clear/Sunny"
- The wind blows at 6.8mph
- It rains a total of 3.1in, over 5 day(s).
Should we swim in Helsinki in september?
No... The water temperature in Helsinki in september is cold
Swimming in Helsinki in september is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average sea temperature of 60°F (minimum: 53°F - maximum: 67°F).
Note also that in september, the climate is good with an average outside temperature of 57°F, 3in of precipitation (over 5 days) and 83.66 % humidity.
Water and normal seasonal temperatures in Helsinki in september
| September | |||
| Average sea temperature | 60°F | ||
| Minimum sea temperature | 53°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 58°F | ||
| Maximum outside temperature | 61°F | ||
| Minimum outside temperature | 56°F | ||
| Wind speed | 13.1mph | ||
| Wind temperature | 52°F | ||
| Precipitation | 3.1in | ||
| Number of days of rain | 5 jour(s) (18%) | ||
| Humidity | 84% | ||
| Visibility in kilometers | 9.51km | ||
| Cloud cover | 46% | ||
| Our opinion | cold swimming |
Chart of the tides in september 2025
Tide times in september 2025 in Helsinki
Swim elsewhere in Finland in september
| City | Average T° | Min. T° | Max. T° | Our opinion | Åland in september | 50°F | 69°F | freezing swimming | Kalajoki in september | 55°F | 61°F | freezing swimming | Kotka in september | 59°F | 66°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 |