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Coldest sea in Japan in March

373 coastal locations in Japan ranked by typical March sea temperature, coldest first. Region-wide average in March: 13.0°C.

Coldest in March

Koiseboi

-0.7°C March mean in Japan

Regional March average

13.0°C

across all 373 coastal locations in Japan

Vs annual mean

-6.0°C

below the year-round regional average

What the Japan sea feels like in March

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
J
F
M
A
M
J
J
A
S
O
N
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 March fits in the year

March 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 March 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 March

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

# Location March mean
1 Koiseboi Hokkaido -0.7°C
2 Abashiri Ko Hokkaido -0.7°C
3 Hojo -0.6°C
4 Furukamappu Wan Hokkaido -0.3°C
5 Mombetsu -0.1°C
6 Tomari Wan Hokkaido -0.1°C
7 Shana Wan Hokkaido -0.0°C
8 Naibo Wan Hokkaido 0.1°C
9 Monbetsu Hokkaido 0.2°C
10 Shibetoro Hokkaido 0.3°C
11 Hanasaki Hokkaido 0.4°C
12 Nemuro Ko Hokkaido 0.4°C
13 Shibetsu 0.5°C
14 Hokkaido 0.6°C
15 Hitokappi Wan Hokkaido 0.6°C
16 Rubeshibetsu Hokkaido 0.8°C
17 Omu Ko Hokkaido 0.8°C
18 Shizunai 0.9°C
19 Moyoro Wan Hokkaido 1.1°C
20 Akkeshi Hokkaido 1.1°C
21 Kiritappu Hokkaido 1.3°C
22 Esashi (Hokkaido Ne Coast) Hokkaido 1.4°C
23 Kushiro 1.6°C
24 Erimo Misaki Hokkaido 1.7°C
25 Urakawa Hokkaido 1.9°C
Show 25 more ▸
26 Sakai 2.2°C
27 Tomakomai 3.0°C
28 Usujiri Hokkaido 3.3°C
29 Soya Misaki Hokkaido 3.3°C
30 Muroran Hokkaidō 3.4°C
31 Usu Wan Hokkaido 3.4°C
32 Mori Ko Hokkaido 3.5°C
33 Noboribetsu 3.7°C
34 Hakodate 3.8°C
35 Wakkanai 3.9°C
36 Oshidomari Wan Hokkaido 5.5°C
37 Tomamae Hokkaido 5.7°C
38 Rumoi Hokkaido 5.9°C
39 Ishikari 6.0°C
40 Sapporo 6.0°C
41 Otaru 6.5°C
42 Yoichi 6.5°C
43 Miyako 6.8°C
44 Aomori Aomori 7.2°C
45 Asamushi Aomori 7.2°C
46 Kamui Misaki Hokkaido 7.2°C
47 Kuji Iwate 7.5°C
48 Kamaishi 7.7°C
49 Yamada 7.7°C
50 Hachinohe 7.8°C

Warmest 10 in Japan in March

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

# Location March mean
1 Yonakuni 24.8°C
2 Yonakuni Shima Okinawa 24.6°C
3 Kobi Sho Okinawa 24.2°C
4 Funauke Okinawa 24.1°C
5 Minami-Tori Shima Tokyo 23.9°C
6 Ishigaki 23.9°C
7 Miyakojima 23.4°C
8 Hirara Okinawa 23.3°C
9 lo Shima Tokyo 23.2°C
10 Kanegusuku Okinawa 22.7°C

More on this region