Kouri Island lies off the northern tip of Okinawa's main island in the East China Sea, connected to the mainland by bridge and served by two operators based in Nago. The four sites in our database cover a wide spread of formats and skill levels: Tokei Beach offers shallow snorkelling from one metre, while the USS Emmons wreck rests at depths between thirty-six and forty-five metres and is reserved for advanced divers. Cape Hedo Dome adds cave, drift, and drop-off diving with strong currents, and Turtle Mansion provides a mid-range boat reef dive. Water temperatures remain in the low-to-mid twenties in winter and climb to twenty-nine degrees in summer, with high visibility frequently exceeding thirty metres in the cooler months.
Monthly water temperature across Kouri Island's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Winter brings the clearest water around Kouri Island, with visibility frequently exceeding thirty metres, while summer conditions are calmer overall. The USS Emmons and Cape Hedo Dome demand advanced certification and current experience regardless of season, so site selection here depends heavily on diver qualification rather than time of year alone.
2 operators
Japan
Water temperature around Kouri Island ranges from about 22°C in February to 28°C in July, based on satellite sea-temperature data for its dive sites.
In the warm season (about 28°C) a rash guard or 3mm shorty is comfortable in Kouri Island; in the coldest months (about 22°C) step up to a 3mm full suit.
Fin maps 4 sites in Kouri Island (4 scuba diving sites).
1 more site to explore
