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Warmest sea in Finland in December

52 coastal locations in Finland ranked by their typical December sea temperature. Region-wide average in December: 4.0°C. The top of the list is where to find the warmest swimming this month.

Warmest in December

Hanko

5.6°C December mean in Finland

Regional December average

4.0°C

across all 52 coastal locations in Finland

Vs annual mean

-3.9°C

below the year-round regional average

What the Finland sea feels like in December

Water at this temperature is freezing cold, can cause pain and takes your breath away. Unless you are very experienced and are under strict supervision, swimming in this water for more than a few minutes can be very dangerous. Be careful, stay safe, and enjoy the rush of endorphins and exhilaration from a brief cold water swim.

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 December fits in the year

December 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 December 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 December

Sorted by the typical December 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 December mean
1 Hanko 5.6°C
2 Ekenaes 5.5°C
3 Hango Hango 5.4°C
4 Särkisalo Southwest Finland 5.4°C
5 Nagu 5.4°C
6 Västanfjärd Southwest Finland 5.4°C
7 Ekenäs Uusimaa 5.3°C
8 Pohja 5.2°C
9 Inga 5.2°C
10 Merimasku 5.0°C
11 Rymattyla 5.0°C
12 Inio 5.0°C
13 Velkua 5.0°C
14 Espoo 5.0°C
15 Helsinki 5.0°C
16 Koukkuniemi 5.0°C
17 Otaniemi 5.0°C
18 Teekkarikylae 5.0°C
19 Aland Islands 4.9°C
20 Naantali 4.9°C
21 Pargas 4.8°C
22 Turku 4.8°C
23 Länsi-Turunmaa Southwest Finland 4.8°C
24 Laensi Turunmaa 4.7°C
25 Houtskar 4.7°C
Show 25 more ▸
26 Kustavi 4.7°C
27 Tampere 4.7°C
28 Porvoo 4.6°C
29 Mariehamn 4.5°C
30 Perna 4.5°C
31 Kotka 4.3°C
32 Kaskinen 4.2°C
33 Pori 4.1°C
34 Pyharanta 4.1°C
35 Rauma 4.1°C
36 Uusikaupunki 4.1°C
37 Hamina 4.0°C
38 Kristinestad 3.9°C
39 Kokkola 3.1°C
40 Imatra 3.0°C
41 lake Saimaa 3.0°C
42 Himanka 2.9°C
43 Oravais 2.8°C
44 Kalajoki 2.6°C
45 Vaasa 2.6°C
46 Pyhajoki 1.9°C
47 Raahe 1.6°C
48 Kemi 0.8°C
49 Keminmaa 0.6°C
50 Kuivaniemi 0.4°C

Coldest 10 in Finland in December

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

# Location December mean
1 Haukipudas 0.4°C
2 Oulu 0.4°C
3 Kuivaniemi 0.4°C
4 Keminmaa 0.6°C
5 Kemi 0.8°C
6 Raahe 1.6°C
7 Pyhajoki 1.9°C
8 Vaasa 2.6°C
9 Kalajoki 2.6°C
10 Oravais 2.8°C

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