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Warmest sea in Finland in September

52 coastal locations in Finland ranked by their typical September sea temperature. Region-wide average in September: 14.6°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

Ekenaes

15.7°C September mean in Finland

Regional September average

14.6°C

across all 52 coastal locations in Finland

Vs annual mean

+6.6°C

above the year-round regional average

What the Finland sea feels like in September

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

Finland monthly average 0.9°C to 17.3°C
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  • Warmest month August 17.3°C
  • Coldest month February 0.9°C
  • Annual mean 7.9°C
  • Months above 20°C 0 of 12

Where September fits in the year

September sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve Finland month rankings:

Finland sea temperature map (live)

The map shows today's latest reading at every Finland location. The list below is based on the typical September mean, useful for trip planning weeks or months ahead.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 warmest Finland locations in September

Sorted by the typical September mean built from a decade of daily readings at each location. Click any place for its 30-day chart, monthly profile, and full 10-year history.

# Location September mean
1 Ekenaes 15.7°C
2 Ekenäs Uusimaa 15.7°C
3 Imatra 15.6°C
4 lake Saimaa 15.6°C
5 Hanko 15.6°C
6 Inga 15.6°C
7 Pohja 15.6°C
8 Kotka 15.5°C
9 Hango Hango 15.5°C
10 Särkisalo Southwest Finland 15.5°C
11 Hamina 15.5°C
12 Espoo 15.4°C
13 Västanfjärd Southwest Finland 15.4°C
14 Perna 15.4°C
15 Helsinki 15.4°C
16 Koukkuniemi 15.4°C
17 Otaniemi 15.4°C
18 Teekkarikylae 15.4°C
19 Porvoo 15.4°C
20 Tampere 15.3°C
21 Länsi-Turunmaa Southwest Finland 15.0°C
22 Nagu 14.9°C
23 Pargas 14.8°C
24 Turku 14.8°C
25 Naantali 14.8°C
Show 25 more ▸
26 Merimasku 14.8°C
27 Rymattyla 14.8°C
28 Velkua 14.7°C
29 Inio 14.7°C
30 Laensi Turunmaa 14.6°C
31 Houtskar 14.6°C
32 Kustavi 14.6°C
33 Aland Islands 14.6°C
34 Mariehamn 14.5°C
35 Pyharanta 14.4°C
36 Rauma 14.4°C
37 Uusikaupunki 14.4°C
38 Pori 14.3°C
39 Kristinestad 14.0°C
40 Kaskinen 13.9°C
41 Kuivaniemi 13.2°C
42 Haukipudas 13.2°C
43 Oulu 13.2°C
44 Keminmaa 13.1°C
45 Vaasa 13.1°C
46 Kemi 13.1°C
47 Oravais 12.9°C
48 Pyhajoki 12.9°C
49 Raahe 12.9°C
50 Himanka 12.8°C

Coldest 10 in Finland in September

Same data the other way. Helpful if you want to know which Finland coasts to avoid for swimming in September.

# Location September mean
1 Kokkola 12.7°C
2 Kalajoki 12.8°C
3 Himanka 12.8°C
4 Raahe 12.9°C
5 Pyhajoki 12.9°C
6 Oravais 12.9°C
7 Kemi 13.1°C
8 Vaasa 13.1°C
9 Keminmaa 13.1°C
10 Haukipudas 13.2°C

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