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Warmest sea in Japan in June

373 coastal locations in Japan ranked by their typical June sea temperature. Region-wide average in June: 20.8°C. The top of the list is where to find the warmest swimming this month.

Warmest in June

Fuji

29.1°C June mean in Japan

Regional June average

20.8°C

across all 373 coastal locations in Japan

Vs annual mean

+1.7°C

above the year-round regional average

What the Japan sea feels like in June

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 June fits in the year

June 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 June 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 June

Sorted by the typical June 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 June mean
1 Fuji 29.1°C
2 Yonakuni Shima Okinawa 29.1°C
3 lo Shima Tokyo 28.9°C
4 Yonakuni 28.9°C
5 Funauke Okinawa 28.8°C
6 Minami-Tori Shima Tokyo 28.7°C
7 Ishigaki 28.5°C
8 Kobi Sho Okinawa 28.3°C
9 Hirara Okinawa 28.2°C
10 Miyakojima 28.2°C
11 Kanegusuku Okinawa 27.6°C
12 Minami-Daito Shima Okinawa 27.4°C
13 Haha Shima Tokyo 27.2°C
14 Kerama Kaikyo (Zamami) Okinawa 27.2°C
15 Naha Ko Okinawa 27.1°C
16 Nakano Shima Kagoshima 27.0°C
17 Tsuhako Okinawa 27.0°C
18 Takara Shima Kagoshima 26.9°C
19 Haebaru 26.8°C
20 Itoman 26.8°C
21 Okinawa 26.8°C
22 Tomigusuku 26.8°C
23 Chichi Shima Tokyo 26.7°C
24 Toguchi Okinawa 26.6°C
25 Chatan 26.6°C
Show 25 more ▸
26 Gushikawa 26.6°C
27 Suku Okinawa 26.5°C
28 Gakiya Okinawa 26.4°C
29 Nago 26.4°C
30 Kuchi-No-Erabu Shima Kagoshima 26.3°C
31 Ogasawara 26.2°C
32 Uken Kagoshima 26.1°C
33 Wadomari Kagoshima 26.1°C
34 Kasari Wan Kagoshima 26.1°C
35 Koniya Kagoshima 25.9°C
36 Isso Kagoshima 25.9°C
37 Sanmura Wan Kagoshima 25.9°C
38 Kumano Kagoshima 25.9°C
39 Amami 25.9°C
40 Yakushima 25.1°C
41 Aburatsu Miyazaki 24.7°C
42 Nishinoomote 24.6°C
43 Odomari Kagoshima 24.4°C
44 Yamagawa Kagoshima 24.4°C
45 Tori Shima Tokyo 24.4°C
46 Shibushi 24.3°C
47 Makurazaki 24.3°C
48 Kozu Sima Tokyo 24.2°C
49 Miyazaki Shi 24.2°C
50 Uchiumi Miyazaki 24.1°C

Coldest 10 in Japan in June

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

# Location June mean
1 Moyoro Wan Hokkaido 5.7°C
2 Shibetoro Hokkaido 6.4°C
3 Hitokappi Wan Hokkaido 6.8°C
4 Naibo Wan Hokkaido 7.2°C
5 Shana Wan Hokkaido 7.3°C
6 Hanasaki Hokkaido 9.7°C
7 Nemuro Ko Hokkaido 9.7°C
8 Furukamappu Wan Hokkaido 9.9°C
9 Mombetsu 10.5°C
10 Kiritappu Hokkaido 10.6°C

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