Seasonal ranking
Coldest sea temperature in Finland in September
Where the sea is coolest across Finland during September, ranked by long-term monthly average water temperature. Yyteri (Finnish Coast, Finland) is the coolest at around 15°C. Open any spot for today's live water temperature and a 7-day swim forecast.
- 1YyteriFinnish Coast · Finland · Baltic SeaCool — shorty wetsuit recommended15°CSeptember average
- 2HietaniemiFinnish Coast · Finland · Baltic SeaCool — shorty wetsuit recommended15°CSeptember average
- 3Ispoinen BeachTurku Archipelago · Finland · Baltic SeaCool — shorty wetsuit recommended15°CSeptember average
- 4Lilla Holmen BeachAland Islands · Finland · Baltic SeaCool — shorty wetsuit recommended15°CSeptember average
Coldest sea in September elsewhere
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Finland in September — frequently asked questions
- Where is the sea coldest in Finland in September?
- Yyteri in Finland has the coldest sea in Finland in September, averaging about 15.0 °C. Hietaniemi (15.0 °C) and Ispoinen Beach are the next coolest.
- How many beaches in Finland are warm enough to swim in September?
- None of the top 4 ranked beaches in Finland reach 22 °C in September, so a wetsuit is recommended for anything longer than a quick dip.
- How are these September sea temperatures calculated?
- Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.
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