Warmest sea in Japan

373 coastal locations in Japan ranked by their year-round average sea temperature. The regional average is 19.1°C. The top of the list shows where to find the warmest water in a typical year. The bottom shows the coldest year-round coasts of the region.

Warmest location

Minami-Tori Shima

27.2°C annual mean in Japan

Regional average

19.1°C

across all 373 Japan coastal locations

Warmest month

August

26.6°C region-wide average

Japan monthly average 12.8°C to 26.6°C

Warmest month August 26.6°C
Coldest month February 12.8°C
Annual mean 19.1°C
Months above 20°C 5 of 12

Month by month across Japan

Sea temperatures in Japan swing from 12.8°C in February to 26.6°C in August on average across every coast we track. That spread of 14°C hides much bigger swings at individual locations.

Want a specific month? Pick one for a dedicated ranking:

Japan sea temperature map

Today's pin colours show the latest daily reading at every Japan location we track. Pick any pin for the location's full page.

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 locations in Japan

The warmest coastal locations across all of Japan, sorted by year-round average. Click any place for its 30-day chart, monthly profile, and 10-year history.

#	Location	Country	Annual mean	Latest
1	Minami-Tori Shima Tokyo	Japan	27.2°C	26.3°C
2	Yonakuni Shima Okinawa	Japan	27.0°C	27.3°C
3	Yonakuni	Japan	26.9°C	27.2°C
4	Funauke Okinawa	Japan	26.7°C	26.8°C
5	lo Shima Tokyo	Japan	26.6°C	25.5°C
6	Ishigaki	Japan	26.5°C	26.3°C
7	Kobi Sho Okinawa	Japan	26.5°C	27.0°C
8	Hirara Okinawa	Japan	26.3°C	25.4°C
9	Miyakojima	Japan	26.3°C	25.6°C
10	Kanegusuku Okinawa	Japan	25.8°C	24.4°C
11	Minami-Daito Shima Okinawa	Japan	25.8°C	25.2°C
12	Kerama Kaikyo (Zamami) Okinawa	Japan	25.6°C	24.2°C
13	Tsuhako Okinawa	Japan	25.6°C	24.0°C
14	Naha Ko Okinawa	Japan	25.6°C	24.1°C
15	Nakano Shima Kagoshima	Japan	25.6°C	25.9°C
16	Haebaru	Japan	25.5°C	23.8°C
17	Itoman	Japan	25.5°C	23.8°C
18	Okinawa	Japan	25.5°C	23.8°C
19	Tomigusuku	Japan	25.5°C	23.8°C
20	Haha Shima Tokyo	Japan	25.4°C	24.2°C
21	Takara Shima Kagoshima	Japan	25.4°C	24.5°C
22	Suku Okinawa	Japan	25.3°C	23.6°C
23	Chatan	Japan	25.3°C	23.5°C
24	Gushikawa	Japan	25.3°C	23.5°C
25	Toguchi Okinawa	Japan	25.3°C	23.5°C

Show 25 more ▸

26	Gakiya Okinawa	Japan	25.2°C	23.2°C
27	Nago	Japan	25.2°C	23.3°C
28	Wadomari Kagoshima	Japan	25.2°C	23.6°C
29	Chichi Shima Tokyo	Japan	25.1°C	23.4°C
30	Sanmura Wan Kagoshima	Japan	25.0°C	23.4°C
31	Amami	Japan	25.0°C	23.4°C
32	Koniya Kagoshima	Japan	25.0°C	23.6°C
33	Uken Kagoshima	Japan	25.0°C	23.7°C
34	Kasari Wan Kagoshima	Japan	25.0°C	23.8°C
35	Kuchi-No-Erabu Shima Kagoshima	Japan	25.0°C	24.8°C
36	Ogasawara	Japan	24.8°C	23.2°C
37	Isso Kagoshima	Japan	24.6°C	23.4°C
38	Kumano Kagoshima	Japan	24.5°C	22.8°C
39	Yakushima	Japan	24.1°C	22.8°C
40	Tori Shima Tokyo	Japan	23.8°C	21.2°C
41	Hachijo Jima Tokyo	Japan	23.6°C	23.4°C
42	Nishinoomote	Japan	23.5°C	22.2°C
43	Makurazaki	Japan	23.3°C	22.6°C
44	Aburatsu Miyazaki	Japan	23.2°C	22.1°C
45	Shibushi	Japan	23.2°C	22.1°C
46	Miyake Shima Tokyo	Japan	23.2°C	20.9°C
47	Odomari Kagoshima	Japan	23.1°C	22.3°C
48	Yamagawa Kagoshima	Japan	23.1°C	22.3°C
49	Kozu Sima Tokyo	Japan	23.1°C	20.7°C
50	Uchiumi Miyazaki	Japan	23.1°C	22.6°C

Coldest 10 in Japan for contrast

Same data, sorted the other way. Useful if you want to know which Japan coasts stay coldest year-round.

#	Location	Country	Annual mean
1	Moyoro Wan Hokkaido	Japan	6.1°C
2	Shibetoro Hokkaido	Japan	6.6°C
3	Hitokappi Wan Hokkaido	Japan	6.8°C
4	Shana Wan Hokkaido	Japan	6.9°C
5	Naibo Wan Hokkaido	Japan	7.0°C
6	Mombetsu	Japan	7.9°C
7	Koiseboi Hokkaido	Japan	8.2°C
8	Abashiri Ko Hokkaido	Japan	8.2°C
9	Furukamappu Wan Hokkaido	Japan	8.3°C
10	Hanasaki Hokkaido	Japan	8.3°C