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Coldest sea in Japan in October

373 coastal locations in Japan ranked by typical October sea temperature, coldest first. Region-wide average in October: 23.0°C.

Coldest in October

Moyoro Wan

11.6°C October mean in Japan

Regional October average

23.0°C

across all 373 coastal locations in Japan

Vs annual mean

+3.9°C

above the year-round regional average

What the Japan sea feels like in October

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

Japan monthly average 12.8°C to 26.6°C
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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 October fits in the year

October 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 October 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 October

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

# Location October mean
1 Moyoro Wan Hokkaido 11.6°C
2 Hitokappi Wan Hokkaido 12.4°C
3 Shibetoro Hokkaido 12.5°C
4 Shana Wan Hokkaido 12.9°C
5 Naibo Wan Hokkaido 13.1°C
6 Mombetsu 13.4°C
7 Hojo 14.1°C
8 Abashiri Ko Hokkaido 14.2°C
9 Koiseboi Hokkaido 14.2°C
10 Mikuni 14.4°C
11 Muta 14.4°C
12 Kiritappu Hokkaido 14.5°C
13 Hanasaki Hokkaido 14.5°C
14 Nemuro Ko Hokkaido 14.5°C
15 Akkeshi Hokkaido 14.7°C
16 Hokkaido 14.7°C
17 Monbetsu Hokkaido 14.7°C
18 Shizunai 14.7°C
19 Kushiro 14.8°C
20 Shibetsu 14.8°C
21 Soya Misaki Hokkaido 14.9°C
22 Esashi (Hokkaido Ne Coast) Hokkaido 15.2°C
23 Furukamappu Wan Hokkaido 15.2°C
24 Rubeshibetsu Hokkaido 15.3°C
25 Omu Ko Hokkaido 15.3°C
Show 25 more ▸
26 Sakai 15.3°C
27 Tomari Wan Hokkaido 15.5°C
28 Wakkanai 15.7°C
29 Erimo Misaki Hokkaido 16.9°C
30 Tomakomai 17.0°C
31 Hakodate 17.3°C
32 Noboribetsu 17.4°C
33 Oshidomari Wan Hokkaido 17.5°C
34 Urakawa Hokkaido 17.5°C
35 Ishikari 17.7°C
36 Sapporo 17.7°C
37 Usujiri Hokkaido 17.7°C
38 Muroran Hokkaidō 17.7°C
39 Usu Wan Hokkaido 17.7°C
40 Otaru 17.8°C
41 Yoichi 17.8°C
42 Mori Ko Hokkaido 17.8°C
43 Rumoi Hokkaido 18.0°C
44 Tomamae Hokkaido 18.1°C
45 Kamui Misaki Hokkaido 18.2°C
46 Miyako 18.9°C
47 Setana Hokkaido 18.9°C
48 Hachinohe 19.0°C
49 Aonae Hokkaido 19.0°C
50 Kuji Iwate 19.2°C

Warmest 10 in Japan in October

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

# Location October mean
1 Minami-Tori Shima Tokyo 29.0°C
2 lo Shima Tokyo 28.7°C
3 Minami-Daito Shima Okinawa 28.4°C
4 Hirara Okinawa 28.2°C
5 Funauke Okinawa 28.1°C
6 Haha Shima Tokyo 28.1°C
7 Tsuhako Okinawa 28.1°C
8 Yonakuni Shima Okinawa 28.1°C
9 Yonakuni 28.0°C
10 Wadomari Kagoshima 28.0°C

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