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Coldest sea in Japan in January

373 coastal locations in Japan ranked by typical January sea temperature, coldest first. Region-wide average in January: 14.1°C.

Coldest in January

Hojo

-0.4°C January mean in Japan

Regional January average

14.1°C

across all 373 coastal locations in Japan

Vs annual mean

-5.0°C

below the year-round regional average

What the Japan sea feels like in January

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.

Japan monthly average 12.8°C to 26.6°C
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F
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A
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  • 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 January fits in the year

January 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 January 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 January

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

# Location January mean
1 Hojo -0.4°C
2 Mombetsu -0.2°C
3 Monbetsu Hokkaido -0.1°C
4 Abashiri Ko Hokkaido -0.1°C
5 Shibetsu 0.0°C
6 Omu Ko Hokkaido 0.1°C
7 Koiseboi Hokkaido 0.5°C
8 Esashi (Hokkaido Ne Coast) Hokkaido 0.5°C
9 Hanasaki Hokkaido 1.4°C
10 Nemuro Ko Hokkaido 1.4°C
11 Tomari Wan Hokkaido 1.5°C
12 Furukamappu Wan Hokkaido 1.6°C
13 Shana Wan Hokkaido 1.8°C
14 Naibo Wan Hokkaido 1.9°C
15 Shibetoro Hokkaido 2.0°C
16 Moyoro Wan Hokkaido 2.1°C
17 Akkeshi Hokkaido 2.2°C
18 Kiritappu Hokkaido 2.3°C
19 Hitokappi Wan Hokkaido 2.3°C
20 Shizunai 2.7°C
21 Hokkaido 2.7°C
22 Rubeshibetsu Hokkaido 2.8°C
23 Kushiro 2.9°C
24 Sakai 3.1°C
25 Soya Misaki Hokkaido 3.2°C
Show 25 more ▸
26 Wakkanai 4.1°C
27 Erimo Misaki Hokkaido 4.5°C
28 Urakawa Hokkaido 4.9°C
29 Muroran Hokkaidō 6.4°C
30 Usu Wan Hokkaido 6.4°C
31 Oshidomari Wan Hokkaido 6.4°C
32 Tomakomai 6.5°C
33 Mori Ko Hokkaido 6.5°C
34 Tomamae Hokkaido 6.5°C
35 Usujiri Hokkaido 6.5°C
36 Hakodate 6.8°C
37 Rumoi Hokkaido 6.8°C
38 Ishikari 7.0°C
39 Sapporo 7.0°C
40 Noboribetsu 7.2°C
41 Otaru 7.5°C
42 Yoichi 7.5°C
43 Kamui Misaki Hokkaido 8.3°C
44 Setana Hokkaido 9.6°C
45 Aomori Aomori 9.6°C
46 Asamushi Aomori 9.6°C
47 Aonae Hokkaido 9.9°C
48 Aomori Shi 9.9°C
49 Hachinohe 10.0°C
50 Kuji Iwate 10.1°C

Warmest 10 in Japan in January

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

# Location January mean
1 Minami-Tori Shima Tokyo 25.4°C
2 Yonakuni 24.2°C
3 Yonakuni Shima Okinawa 24.1°C
4 Kobi Sho Okinawa 23.7°C
5 lo Shima Tokyo 23.6°C
6 Funauke Okinawa 23.6°C
7 Ishigaki 23.6°C
8 Miyakojima 23.4°C
9 Hirara Okinawa 23.2°C
10 Minami-Daito Shima Okinawa 22.9°C

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