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Coldest sea in Finland in September

52 coastal locations in Finland ranked by typical September sea temperature, coldest first. Region-wide average in September: 14.6°C.

Coldest in September

Kokkola

12.7°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.

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 coldest Finland locations in September

Sorted by typical September mean from a decade of daily readings, coldest first. Click any place for the full location page.

# 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
11 Oulu 13.2°C
12 Kuivaniemi 13.2°C
13 Kaskinen 13.9°C
14 Kristinestad 14.0°C
15 Pori 14.3°C
16 Pyharanta 14.4°C
17 Rauma 14.4°C
18 Uusikaupunki 14.4°C
19 Mariehamn 14.5°C
20 Aland Islands 14.6°C
21 Houtskar 14.6°C
22 Kustavi 14.6°C
23 Laensi Turunmaa 14.6°C
24 Inio 14.7°C
25 Velkua 14.7°C
Show 25 more ▸
26 Merimasku 14.8°C
27 Rymattyla 14.8°C
28 Naantali 14.8°C
29 Pargas 14.8°C
30 Turku 14.8°C
31 Nagu 14.9°C
32 Länsi-Turunmaa Southwest Finland 15.0°C
33 Tampere 15.3°C
34 Porvoo 15.4°C
35 Helsinki 15.4°C
36 Koukkuniemi 15.4°C
37 Otaniemi 15.4°C
38 Teekkarikylae 15.4°C
39 Perna 15.4°C
40 Espoo 15.4°C
41 Västanfjärd Southwest Finland 15.4°C
42 Hamina 15.5°C
43 Hango Hango 15.5°C
44 Särkisalo Southwest Finland 15.5°C
45 Kotka 15.5°C
46 Hanko 15.6°C
47 Inga 15.6°C
48 Pohja 15.6°C
49 Imatra 15.6°C
50 lake Saimaa 15.6°C

Warmest 10 in Finland in September

Same data the other way. The warmest spots for the same month.

# 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

More on this region