Sea temperature and swimming season in Finland
When the sea is warm enough to swim in 15 coastal cities in Finland.
| City | Warmest | Coldest | Swimming season |
|---|---|---|---|
| Helsinki | 17.8°C Aug | 0.9°C Feb | never comfortable |
| Vantaa | 17.8°C Aug | 0.7°C Feb | never comfortable |
| Oulu | 18.7°C Jul | -0.1°C Feb | never comfortable |
| Pori | 17.7°C Aug | 0.3°C Feb | never comfortable |
| Vaasa | 17.4°C Jul | -0.1°C Feb | never comfortable |
| Kotka | 18.6°C Aug | 0.3°C Feb | never comfortable |
| Kokkola | 16.9°C Aug | 0.0°C Feb | never comfortable |
| Kirkkonummi | 17.8°C Aug | 1.0°C Feb | never comfortable |
| Rauma | 17.9°C Aug | 0.4°C Feb | never comfortable |
| Raahe | 17.0°C Aug | 0.0°C Feb | never comfortable |
| Tornio | 17.6°C Jul | -0.1°C Feb | never comfortable |
| Jakobstad | 16.8°C Aug | 0.0°C Feb | never comfortable |
| Kemi | 18.0°C Jul | -0.1°C Feb | never comfortable |
| Uusikaupunki | 17.7°C Aug | 0.7°C Feb | never comfortable |
| Närpes | 17.1°C Aug | 0.4°C Feb | never comfortable |
Knowing the temperature is only half of it. What to wear, and why cold shock is the real risk →
Season uses 19°C. Why that number, and where the data comes from