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

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

In may in Ishigaki-jima and Yonaguni-jima, swimming conditions are perfect! With water reaching a maximum of 85°F and an average of 81°F, going in the water (and staying there!) feels great.

As for Okinawa, Kagoshima (Kyushu), Nago, Naha, Aguni-jima, Higashi, Iheya-jima, Itoman, Izenajima, Kumano Kodo, Miyagi Island, Tanega-shima, Tosashimizu, Yakushima, Yoron-jima, Miyazaki, Nichinan, Nobeoka, Saiki, Shibushi Bay and Uwajima, swimming is pleasant in may. The sea water is 77°F on average (min: 73°F/max: 81°F) so you can easily spend time in the water.

Swimming in may in Tokyo, Fukuoka, Hiroshima, Kochi, Nagoya, Osaka, Hakone, Izumo, Kobe, Nagasaki, Okayama, Takamatsu, Tokushima, Goto islands, Ise, Izu, Kamakura, Kitakyushu, Kure, Miyajima, Muroto, Yokohama, Asahi, Beppu/Ōita, Chiba, Fuji, Hamada, Hamamatsu, Karatsu, Kimitsu, Maizuru, Masuda, Matsuyama, Minamata, Niihama, Sasebo, Shingu, Shizuoka, Tamano, Tateyama and Wakayama is possible but the sea is generally cool. So though the sea temperature may sometimes reach 69°F, it can also go as low as 60°F. Note that the average is 64°F.

Swimming in may in Kanazawa, Tottori, Wajima, Hikari, Hitachi-Naka, Iwaki, Kurayoshi, Toyama and Ube is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average temperature of 60°F (min: 54°F/max: 67°F).

Forget about swimming in Sapporo (Hokkaido), Abashiri, Akita, Aomori, Hakodate, Sendai (Honshu), Monbetsu, Niigata, Sado island, Shiretoko National Park, Hachinohe, Ishinomaki, Joetsu, Kamaishi, Kushiro, Miyako, Muroran, Mutsu, Nagaoka, Nanao, Nemuro, Noshiro, Otaru, Sakata, Tomakomai and Wakkanai in may! The water temperature is freezing, reaching as low as 45°F (and only 56°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!