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Coldest sea in Japan in December

373 coastal locations in Japan ranked by typical December sea temperature, coldest first. Region-wide average in December: 16.7°C.

Coldest in December

Mombetsu

3.1°C December mean in Japan

Regional December average

16.7°C

across all 373 coastal locations in Japan

Vs annual mean

-2.4°C

below the year-round regional average

What the Japan sea feels like in December

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

Japan monthly average 12.8°C to 26.6°C
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D
  • Warmest month August 26.6°C
  • Coldest month February 12.8°C
  • Annual mean 19.1°C
  • Months above 20°C 5 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 Japan month rankings:

Japan sea temperature map (live)

The map shows today's latest reading at every Japan location. The list below is based on the typical December 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 Japan locations in December

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

# Location December mean
1 Mombetsu 3.1°C
2 Abashiri Ko Hokkaido 3.2°C
3 Hojo 3.3°C
4 Monbetsu Hokkaido 3.5°C
5 Koiseboi Hokkaido 3.6°C
6 Shibetsu 3.8°C
7 Omu Ko Hokkaido 4.3°C
8 Moyoro Wan Hokkaido 4.5°C
9 Naibo Wan Hokkaido 4.8°C
10 Shana Wan Hokkaido 4.8°C
11 Shibetoro Hokkaido 4.9°C
12 Hitokappi Wan Hokkaido 4.9°C
13 Esashi (Hokkaido Ne Coast) Hokkaido 5.1°C
14 Tomari Wan Hokkaido 5.2°C
15 Hanasaki Hokkaido 5.2°C
16 Nemuro Ko Hokkaido 5.2°C
17 Furukamappu Wan Hokkaido 5.3°C
18 Sakai 5.7°C
19 Kiritappu Hokkaido 6.3°C
20 Akkeshi Hokkaido 6.4°C
21 Kushiro 6.8°C
22 Shizunai 7.0°C
23 Soya Misaki Hokkaido 7.1°C
24 Hokkaido 7.2°C
25 Wakkanai 7.6°C
Show 25 more ▸
26 Rubeshibetsu Hokkaido 7.6°C
27 Erimo Misaki Hokkaido 8.5°C
28 Urakawa Hokkaido 9.1°C
29 Ishikari 9.2°C
30 Sapporo 9.2°C
31 Tomamae Hokkaido 9.3°C
32 Oshidomari Wan Hokkaido 9.4°C
33 Rumoi Hokkaido 9.4°C
34 Hakodate 9.7°C
35 Muroran Hokkaidō 9.7°C
36 Usu Wan Hokkaido 9.7°C
37 Otaru 9.7°C
38 Yoichi 9.7°C
39 Mori Ko Hokkaido 9.8°C
40 Usujiri Hokkaido 9.9°C
41 Tomakomai 10.1°C
42 Noboribetsu 10.4°C
43 Kamui Misaki Hokkaido 10.7°C
44 Aonae Hokkaido 11.6°C
45 Setana Hokkaido 11.6°C
46 Aomori Aomori 12.1°C
47 Asamushi Aomori 12.1°C
48 Mikuni 12.2°C
49 Muta 12.2°C
50 Aomori Shi 12.3°C

Warmest 10 in Japan in December

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

# Location December mean
1 Minami-Tori Shima Tokyo 26.7°C
2 lo Shima Tokyo 25.5°C
3 Yonakuni 25.4°C
4 Yonakuni Shima Okinawa 25.4°C
5 Kobi Sho Okinawa 25.1°C
6 Funauke Okinawa 25.0°C
7 Ishigaki 24.8°C
8 Hirara Okinawa 24.6°C
9 Miyakojima 24.6°C
10 Minami-Daito Shima Okinawa 24.5°C

More on this region