Swimming in Japan in october 2025 Sea temperature by city in october

In october in Japan swimming conditions vary by city. Details below:

In october in Okinawa, Nago, Naha, Aguni-jima, Higashi, Iheya-jima, Ishigaki-jima, Itoman, Izenajima, Miyagi Island, Tanega-shima, Yakushima, Yonaguni-jima, Yoron-jima, Miyazaki and Shibushi Bay, swimming conditions are perfect! With water reaching a maximum of 83°F and an average of 81°F, going in the water (and staying there!) feels great.

As for Tokyo, Fukuoka, Hiroshima, Kochi, Nagoya, Osaka, Hakone, Izumo, Kagoshima (Kyushu), Kanazawa, Kobe, Nagasaki, Okayama, Takamatsu, Tokushima, Goto islands, Ise, Izu, Kamakura, Kitakyushu, Kumano Kodo, Kure, Miyajima, Muroto, Niigata, Sado island, Tosashimizu, Tottori, Wajima, Yokohama, Asahi, Beppu/Ōita, Chiba, Fuji, Hamada, Hamamatsu, Hikari, Joetsu, Karatsu, Kimitsu, Kurayoshi, Maizuru, Masuda, Matsuyama, Minamata, Nagaoka, Nanao, Nichinan, Niihama, Nobeoka, Saiki, Sasebo, Shingu, Shizuoka, Tamano, Tateyama, Toyama, Ube, Uwajima and Wakayama, swimming is pleasant in october. The sea water is 72°F on average (min: 70°F/max: 75°F) so you can easily spend time in the water.

Swimming in october in Akita, Aomori, Hakodate, Sendai (Honshu), Hachinohe, Hitachi-Naka, Ishinomaki, Iwaki, Kamaishi, Miyako, Mutsu, Noshiro and Sakata is possible but the sea is generally cool. So though the sea temperature may sometimes reach 72°F, it can also go as low as 66°F. Note that the average is 69°F.

Swimming in october in Sapporo (Hokkaido), Muroran, Otaru and Tomakomai is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average temperature of 63°F (min: 58°F/max: 67°F).

Forget about swimming in Abashiri, Monbetsu, Shiretoko National Park, Kushiro, Nemuro and Wakkanai in october! The water temperature is freezing, reaching as low as 52°F (and only 62°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!