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Warmest sea in Japan in August

373 coastal locations in Japan ranked by their typical August sea temperature. Region-wide average in August: 26.6°C. The top of the list is where to find the warmest swimming this month.

Warmest in August

Fuji

30.5°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, useful for trip planning weeks or months ahead.

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 warmest Japan locations in August

Sorted by the typical August mean built from a decade of daily readings at each location. Click any place for its 30-day chart, monthly profile, and full 10-year history.

# 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
11 Nakano Shima Kagoshima 29.4°C
12 Kanegusuku Okinawa 29.4°C
13 lo Shima Tokyo 29.4°C
14 Haebaru 29.4°C
15 Itoman 29.4°C
16 Okinawa 29.4°C
17 Tomigusuku 29.4°C
18 Kobi Sho Okinawa 29.3°C
19 Chatan 29.3°C
20 Gushikawa 29.3°C
21 Kuchi-No-Erabu Shima Kagoshima 29.3°C
22 Nago 29.3°C
23 Kasari Wan Kagoshima 29.3°C
24 Uken Kagoshima 29.3°C
25 Gakiya Okinawa 29.3°C
Show 25 more ▸
26 Koniya Kagoshima 29.3°C
27 Wadomari Kagoshima 29.3°C
28 Tsuhako Okinawa 29.2°C
29 Kerama Kaikyo (Zamami) Okinawa 29.2°C
30 Amami 29.2°C
31 Toguchi Okinawa 29.2°C
32 Naha Ko Okinawa 29.2°C
33 Suku Okinawa 29.2°C
34 Sanmura Wan Kagoshima 29.2°C
35 Isso Kagoshima 29.1°C
36 Kumano Kagoshima 29.0°C
37 Me Shima Nagasaki 29.0°C
38 Yakushima 29.0°C
39 Makurazaki 28.9°C
40 Urauchi Wan Kagoshima 28.8°C
41 Haha Shima Tokyo 28.8°C
42 Kushikino 28.8°C
43 Odomari Kagoshima 28.8°C
44 Yamagawa Kagoshima 28.8°C
45 Kagoshima Kagoshima 28.8°C
46 Kiire Kagoshima 28.8°C
47 Nishinoomote 28.8°C
48 Tori Shima Tokyo 28.8°C
49 Tarumizu 28.7°C
50 Akune 28.7°C

Coldest 10 in Japan in August

Same data the other way. Helpful if you want to know which Japan coasts to avoid for swimming in August.

# 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

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