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Coldest sea in Japan in August

373 coastal locations in Japan ranked by typical August sea temperature, coldest first. Region-wide average in August: 26.6°C.

Coldest in August

Moyoro Wan

12.6°C August mean in Japan

Regional August average

26.6°C

across all 373 coastal locations in Japan

Vs annual mean

+7.5°C

above the year-round regional average

What the Japan sea feels like in August

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid 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 August fits in the year

August 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 August 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 August

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

# Location August mean
1 Moyoro Wan Hokkaido 12.6°C
2 Hitokappi Wan Hokkaido 14.2°C
3 Shibetoro Hokkaido 14.4°C
4 Mikuni 14.8°C
5 Muta 14.8°C
6 Shana Wan Hokkaido 15.2°C
7 Naibo Wan Hokkaido 15.7°C
8 Hanasaki Hokkaido 17.7°C
9 Nemuro Ko Hokkaido 17.7°C
10 Furukamappu Wan Hokkaido 18.2°C
11 Kiritappu Hokkaido 18.4°C
12 Akkeshi Hokkaido 18.6°C
13 Mombetsu 18.6°C
14 Tomari Wan Hokkaido 18.7°C
15 Shizunai 19.0°C
16 Kushiro 19.1°C
17 Hokkaido 19.1°C
18 Shibetsu 19.1°C
19 Esashi (Hokkaido Ne Coast) Hokkaido 19.2°C
20 Koiseboi Hokkaido 19.4°C
21 Omu Ko Hokkaido 19.4°C
22 Soya Misaki Hokkaido 19.4°C
23 Abashiri Ko Hokkaido 19.6°C
24 Monbetsu Hokkaido 19.6°C
25 Hojo 19.7°C
Show 25 more ▸
26 Rubeshibetsu Hokkaido 19.8°C
27 Wakkanai 19.9°C
28 Tenno 20.9°C
29 Oshidomari Wan Hokkaido 21.0°C
30 Erimo Misaki Hokkaido 21.1°C
31 Tomakomai 21.3°C
32 Noboribetsu 21.6°C
33 Urakawa Hokkaido 21.6°C
34 Hakodate 21.9°C
35 Hachinohe 22.0°C
36 Tomamae Hokkaido 22.2°C
37 Usujiri Hokkaido 22.3°C
38 Muroran Hokkaidō 22.3°C
39 Usu Wan Hokkaido 22.3°C
40 Otaru 22.4°C
41 Yoichi 22.4°C
42 Ishikari 22.5°C
43 Mori Ko Hokkaido 22.5°C
44 Sapporo 22.5°C
45 Miyako 22.5°C
46 Rumoi Hokkaido 22.5°C
47 Kamui Misaki Hokkaido 22.6°C
48 Shiriya Aomori 22.9°C
49 Tomari Aomori 22.9°C
50 Kuji Iwate 22.9°C

Warmest 10 in Japan in August

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

# Location August mean
1 Fuji 30.5°C
2 Ishigaki 29.7°C
3 Yonakuni Shima Okinawa 29.7°C
4 Funauke Okinawa 29.7°C
5 Miyakojima 29.6°C
6 Yonakuni 29.6°C
7 Hirara Okinawa 29.6°C
8 Takara Shima Kagoshima 29.5°C
9 Minami-Tori Shima Tokyo 29.5°C
10 Minami-Daito Shima Okinawa 29.4°C

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