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Warmest sea in Japan in March

373 coastal locations in Japan ranked by their typical March sea temperature. Region-wide average in March: 13.0°C. The top of the list is where to find the warmest swimming this month.

Warmest in March

Yonakuni

24.8°C March mean in Japan

Regional March average

13.0°C

across all 373 coastal locations in Japan

Vs annual mean

-6.0°C

below the year-round regional average

What the Japan sea feels like in March

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

Japan monthly average 12.8°C to 26.6°C
J
F
M
A
M
J
J
A
S
O
N
D
  • 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 March fits in the year

March 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 March 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 March

Sorted by the typical March 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 March mean
1 Yonakuni 24.8°C
2 Yonakuni Shima Okinawa 24.6°C
3 Kobi Sho Okinawa 24.2°C
4 Funauke Okinawa 24.1°C
5 Minami-Tori Shima Tokyo 23.9°C
6 Ishigaki 23.9°C
7 Miyakojima 23.4°C
8 Hirara Okinawa 23.3°C
9 lo Shima Tokyo 23.2°C
10 Kanegusuku Okinawa 22.7°C
11 Nakano Shima Kagoshima 22.5°C
12 Minami-Daito Shima Okinawa 22.4°C
13 Kerama Kaikyo (Zamami) Okinawa 22.3°C
14 Naha Ko Okinawa 22.2°C
15 Tsuhako Okinawa 22.2°C
16 Takara Shima Kagoshima 22.1°C
17 Haebaru 22.1°C
18 Itoman 22.1°C
19 Okinawa 22.1°C
20 Tomigusuku 22.1°C
21 Gakiya Okinawa 22.0°C
22 Chatan 21.9°C
23 Gushikawa 21.9°C
24 Toguchi Okinawa 21.9°C
25 Nago 21.9°C
Show 25 more ▸
26 Suku Okinawa 21.9°C
27 Kuchi-No-Erabu Shima Kagoshima 21.7°C
28 Wadomari Kagoshima 21.7°C
29 Haha Shima Tokyo 21.5°C
30 Uken Kagoshima 21.5°C
31 Sanmura Wan Kagoshima 21.4°C
32 Amami 21.4°C
33 Kasari Wan Kagoshima 21.4°C
34 Koniya Kagoshima 21.4°C
35 Chichi Shima Tokyo 21.2°C
36 Isso Kagoshima 21.0°C
37 Ogasawara 20.9°C
38 Kumano Kagoshima 20.8°C
39 Yakushima 20.4°C
40 Nishinoomote 19.6°C
41 Hachijo Jima Tokyo 19.6°C
42 Tori Shima Tokyo 19.5°C
43 Makurazaki 19.4°C
44 Uchiumi Miyazaki 19.2°C
45 Miyazaki Shi 19.2°C
46 Shibushi 19.2°C
47 Aburatsu Miyazaki 19.1°C
48 Odomari Kagoshima 18.9°C
49 Yamagawa Kagoshima 18.9°C
50 Tarumizu 18.8°C

Coldest 10 in Japan in March

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

# Location March mean
1 Koiseboi Hokkaido -0.7°C
2 Abashiri Ko Hokkaido -0.7°C
3 Hojo -0.6°C
4 Furukamappu Wan Hokkaido -0.3°C
5 Mombetsu -0.1°C
6 Tomari Wan Hokkaido -0.1°C
7 Shana Wan Hokkaido -0.0°C
8 Naibo Wan Hokkaido 0.1°C
9 Monbetsu Hokkaido 0.2°C
10 Shibetoro Hokkaido 0.3°C

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