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Coldest sea in Japan in April

373 coastal locations in Japan ranked by typical April sea temperature, coldest first. Region-wide average in April: 14.8°C.

Coldest in April

Shibetoro

1.4°C April mean in Japan

Regional April average

14.8°C

across all 373 coastal locations in Japan

Vs annual mean

-4.3°C

below the year-round regional average

What the Japan sea feels like in April

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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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 April fits in the year

April 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 April 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 April

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

# Location April mean
1 Shibetoro Hokkaido 1.4°C
2 Shana Wan Hokkaido 1.4°C
3 Naibo Wan Hokkaido 1.6°C
4 Hojo 1.6°C
5 Moyoro Wan Hokkaido 1.8°C
6 Furukamappu Wan Hokkaido 1.8°C
7 Hitokappi Wan Hokkaido 1.8°C
8 Koiseboi Hokkaido 2.3°C
9 Abashiri Ko Hokkaido 2.5°C
10 Mombetsu 2.9°C
11 Hanasaki Hokkaido 3.0°C
12 Nemuro Ko Hokkaido 3.0°C
13 Kiritappu Hokkaido 3.1°C
14 Hokkaido 3.1°C
15 Akkeshi Hokkaido 3.1°C
16 Rubeshibetsu Hokkaido 3.1°C
17 Tomari Wan Hokkaido 3.1°C
18 Kushiro 3.4°C
19 Shizunai 3.5°C
20 Monbetsu Hokkaido 3.7°C
21 Erimo Misaki Hokkaido 3.7°C
22 Urakawa Hokkaido 4.0°C
23 Shibetsu 4.0°C
24 Omu Ko Hokkaido 4.5°C
25 Esashi (Hokkaido Ne Coast) Hokkaido 4.8°C
Show 25 more ▸
26 Sakai 5.0°C
27 Tomakomai 5.1°C
28 Soya Misaki Hokkaido 5.4°C
29 Noboribetsu 5.6°C
30 Usujiri Hokkaido 5.7°C
31 Hakodate 5.7°C
32 Muroran Hokkaidō 5.8°C
33 Usu Wan Hokkaido 5.8°C
34 Mori Ko Hokkaido 5.9°C
35 Wakkanai 6.0°C
36 Oshidomari Wan Hokkaido 7.0°C
37 Tomamae Hokkaido 7.8°C
38 Rumoi Hokkaido 8.0°C
39 Ishikari 8.0°C
40 Sapporo 8.0°C
41 Otaru 8.2°C
42 Yoichi 8.2°C
43 Kamui Misaki Hokkaido 8.3°C
44 Kuji Iwate 8.7°C
45 Hachinohe 8.9°C
46 Aomori Aomori 8.9°C
47 Asamushi Aomori 8.9°C
48 Shiriya Aomori 9.0°C
49 Tomari Aomori 9.0°C
50 Miyako 9.0°C

Warmest 10 in Japan in April

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

# Location April mean
1 Yonakuni 25.9°C
2 Yonakuni Shima Okinawa 25.9°C
3 Kobi Sho Okinawa 25.4°C
4 Funauke Okinawa 25.3°C
5 Ishigaki 25.0°C
6 Minami-Tori Shima Tokyo 24.9°C
7 Miyakojima 24.4°C
8 Hirara Okinawa 24.4°C
9 lo Shima Tokyo 24.4°C
10 Nakano Shima Kagoshima 23.8°C

More on this region