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

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

In august in Fukuoka, Hiroshima, Kochi, Nagoya, Okinawa, Osaka, Hakone, Izumo, Kagoshima (Kyushu), Kanazawa, Kobe, Nagasaki, Nago, Naha, Okayama, Takamatsu, Tokushima, Aguni-jima, Goto islands, Higashi, Iheya-jima, Ise, Ishigaki-jima, Itoman, Izenajima, Izu, Kamakura, Kitakyushu, Kumano Kodo, Kure, Miyagi Island, Miyajima, Muroto, Niigata, Sado island, Tanega-shima, Tosashimizu, Tottori, Wajima, Yakushima, Yokohama, Yonaguni-jima, Yoron-jima, Beppu/Ōita, Fuji, Hamada, Hamamatsu, Hikari, Joetsu, Karatsu, Kimitsu, Kurayoshi, Maizuru, Masuda, Matsuyama, Minamata, Miyazaki, Nagaoka, Nanao, Nichinan, Niihama, Nobeoka, Saiki, Sasebo, Shibushi Bay, Shingu, Shizuoka, Tamano, Tateyama, Toyama, Ube, Uwajima and Wakayama, swimming conditions are perfect! With water reaching a maximum of 85°F and an average of 82°F, going in the water (and staying there!) feels great.

As for Tokyo, Sapporo (Hokkaido), Akita, Aomori, Hakodate, Sendai (Honshu), Asahi, Chiba, Hachinohe, Hitachi-Naka, Ishinomaki, Iwaki, Kamaishi, Miyako, Muroran, Mutsu, Noshiro, Otaru and Sakata, swimming is pleasant in august. The sea water is 78°F on average (min: 76°F/max: 81°F) so you can easily spend time in the water.

Swimming in august in Abashiri, Monbetsu, Shiretoko National Park, Kushiro, Tomakomai and Wakkanai is possible but the sea is generally cool. So though the sea temperature may sometimes reach 68°F, it can also go as low as 59°F. Note that the average is 63°F.

Swimming in august in Nemuro is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average temperature of 63°F (min: 59°F/max: 68°F).