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Warmest sea in Japan in July

373 coastal locations in Japan ranked by their typical July sea temperature. Region-wide average in July: 24.4°C. The top of the list is where to find the warmest swimming this month.

Warmest in July

Fuji

30.4°C July mean in Japan

Regional July average

24.4°C

across all 373 coastal locations in Japan

Vs annual mean

+5.3°C

above the year-round regional average

What the Japan sea feels like in July

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 July fits in the year

July 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 July 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 July

Sorted by the typical July 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 July mean
1 Fuji 30.4°C
2 lo Shima Tokyo 29.6°C
3 Yonakuni Shima Okinawa 29.6°C
4 Funauke Okinawa 29.6°C
5 Yonakuni 29.5°C
6 Ishigaki 29.5°C
7 Hirara Okinawa 29.4°C
8 Minami-Tori Shima Tokyo 29.4°C
9 Miyakojima 29.4°C
10 Kanegusuku Okinawa 29.4°C
11 Minami-Daito Shima Okinawa 29.2°C
12 Kerama Kaikyo (Zamami) Okinawa 29.1°C
13 Takara Shima Kagoshima 29.1°C
14 Kobi Sho Okinawa 29.1°C
15 Naha Ko Okinawa 29.0°C
16 Nakano Shima Kagoshima 28.9°C
17 Tsuhako Okinawa 28.9°C
18 Haebaru 28.9°C
19 Itoman 28.9°C
20 Okinawa 28.9°C
21 Tomigusuku 28.9°C
22 Gakiya Okinawa 28.8°C
23 Toguchi Okinawa 28.8°C
24 Haha Shima Tokyo 28.7°C
25 Chatan 28.7°C
Show 25 more ▸
26 Gushikawa 28.7°C
27 Suku Okinawa 28.7°C
28 Nago 28.7°C
29 Uken Kagoshima 28.7°C
30 Kasari Wan Kagoshima 28.6°C
31 Wadomari Kagoshima 28.6°C
32 Koniya Kagoshima 28.5°C
33 Kuchi-No-Erabu Shima Kagoshima 28.5°C
34 Sanmura Wan Kagoshima 28.5°C
35 Amami 28.4°C
36 Chichi Shima Tokyo 28.4°C
37 Isso Kagoshima 28.2°C
38 Ogasawara 28.2°C
39 Kumano Kagoshima 28.0°C
40 Yakushima 27.8°C
41 Tori Shima Tokyo 27.4°C
42 Makurazaki 27.4°C
43 Odomari Kagoshima 27.4°C
44 Yamagawa Kagoshima 27.4°C
45 Nishinoomote 27.3°C
46 Me Shima Nagasaki 27.3°C
47 Kagoshima Kagoshima 27.2°C
48 Kiire Kagoshima 27.2°C
49 Tarumizu 27.2°C
50 Kagoshima-Shi 27.1°C

Coldest 10 in Japan in July

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

# Location July mean
1 Moyoro Wan Hokkaido 9.0°C
2 Hitokappi Wan Hokkaido 10.5°C
3 Shibetoro Hokkaido 10.8°C
4 Shana Wan Hokkaido 11.7°C
5 Naibo Wan Hokkaido 11.8°C
6 Mikuni 13.9°C
7 Muta 13.9°C
8 Hanasaki Hokkaido 14.1°C
9 Nemuro Ko Hokkaido 14.1°C
10 Furukamappu Wan Hokkaido 14.7°C

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