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Coldest sea in Finland

52 coastal locations in Finland ranked by year-round average sea temperature, coldest first. The regional average is 8.0°C. The top of the list is where the water stays cold all year. The contrast list at the bottom shows the warmest coasts for context.

Coldest location

Kalajoki

Year-round average 6.2°C in Finland

Regional average

8.0°C

across all 52 Finland coastal locations

Coldest month

February

0.9°C region-wide average

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

Month by month across Finland

Sea temperatures in Finland swing from 0.9°C in February to 17.3°C in August on average across every coast we track. That spread of 16°C hides much bigger swings at individual locations.

Want a specific month? Pick one for a dedicated ranking:

Finland sea temperature map

Today's pin colours show the latest daily reading at every Finland location we track. Cool blues cluster around the high-latitude coasts.

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 locations in Finland

Coastal locations across Finland sorted by year-round average, coldest first. Honest cold-water swimming country. Click any place for its 30-day chart, monthly profile, and 10-year history.

# Location Annual mean
1 Kalajoki 6.2°C
2 Kemi 6.2°C
3 Keminmaa 6.2°C
4 Raahe 6.2°C
5 Himanka 6.2°C
6 Kuivaniemi 6.2°C
7 Haukipudas 6.2°C
8 Oulu 6.2°C
9 Pyhajoki 6.2°C
10 Kokkola 6.3°C
11 Oravais 6.5°C
12 Vaasa 6.6°C
13 Kristinestad 7.4°C
14 Kaskinen 7.5°C
15 Pori 7.8°C
16 Pyharanta 7.8°C
17 Rauma 7.8°C
18 Uusikaupunki 7.8°C
19 Mariehamn 8.1°C
20 Imatra 8.2°C
21 lake Saimaa 8.2°C
22 Hamina 8.3°C
23 Aland Islands 8.4°C
24 Houtskar 8.4°C
25 Kustavi 8.4°C
Show 25 more ▸
26 Kotka 8.4°C
27 Tampere 8.4°C
28 Porvoo 8.4°C
29 Perna 8.4°C
30 Laensi Turunmaa 8.5°C
31 Inio 8.5°C
32 Velkua 8.6°C
33 Helsinki 8.6°C
34 Koukkuniemi 8.6°C
35 Otaniemi 8.6°C
36 Teekkarikylae 8.6°C
37 Espoo 8.6°C
38 Merimasku 8.6°C
39 Rymattyla 8.6°C
40 Naantali 8.6°C
41 Pargas 8.6°C
42 Turku 8.6°C
43 Inga 8.7°C
44 Pohja 8.7°C
45 Nagu 8.7°C
46 Ekenaes 8.9°C
47 Ekenäs Uusimaa 8.9°C
48 Länsi-Turunmaa Southwest Finland 8.9°C
49 Hanko 8.9°C
50 Västanfjärd Southwest Finland 9.0°C

Warmest 10 in Finland for contrast

Same data flipped. Useful if you want to know which Finland coasts stay warmest year-round before you commit to a cold-water swim trip.

# Location Annual mean
1 Hango Hango 9.0°C
2 Särkisalo Southwest Finland 9.0°C
3 Västanfjärd Southwest Finland 9.0°C
4 Hanko 8.9°C
5 Länsi-Turunmaa Southwest Finland 8.9°C
6 Ekenaes 8.9°C
7 Ekenäs Uusimaa 8.9°C
8 Nagu 8.7°C
9 Pohja 8.7°C
10 Inga 8.7°C

More on this region