Aka's sites are almost entirely reef-based, ranging from shallow coral gardens accessible to beginners through to deeper drift dives that demand more experience. Visibility is consistently strong, and the species list is rich: Green Sea Turtle, Titan Triggerfish, Turkey Moray, and Lunartail Grouper are all regularly observed. Nita Cave adds variety for intermediate divers. Conditions run warmest from mid-summer into autumn, with calmer, warmer water suiting snorkellers and new divers alike.
Monthly water temperature across Aka's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water stays warm from June through October, peaking in late summer, making these the most popular months for diving. Cooler conditions from January to March are still diveable but suit those comfortable with slightly fresher water. Shimozone's strong currents suit advanced divers year-round, while calmer sites like Gina and Adan Shita are welcoming for most of the year.
11 operators
Water temperature around Aka ranges from about 22°C in February to 29°C in August, based on satellite sea-temperature data for its dive sites.
6 more sites to explore
In the warm season (about 29°C) a rash guard or 3mm shorty is comfortable in Aka; in the coldest months (about 22°C) step up to a 3mm full suit.
Fin maps 13 sites in Aka (10 scuba diving sites and 7 snorkelling spots, with some suited to both).
Green Sea Turtle is one of the most frequently encountered species across Aka's reef sites. Titan Triggerfish and Clown Triggerfish are both observed regularly, as are Lunartail Grouper and Turkey Moray. Patient divers may also spot the Day Octopus and the striking Regal Angelfish among the coral.
The majority of sites around Aka are rated for beginners, including Gina, Adan Shita, Butsu Butsu Coral, and Nishibama, all of which feature mild currents and accessible reef structures. Intermediate divers have Nita Cave to explore, while Shimozone's strong drift conditions are best left to experienced divers. There is a good range of operators on hand to guide newer divers.
All of the listed dive and snorkel sites in Aka are accessed by boat. Several local operators, including Dive Estivant, Aloha Divers Okinawa, and Marine House Aharen, run boat trips to the sites and can also help with equipment rental.
The majority of Aka's sites are coral reef dives, varying in depth from very shallow beginners' sections to deeper walls and slopes. Nita Cave offers a single-depth cave experience for intermediate divers seeking something different. Shimozone stands apart as a drift reef where strong currents create a more dynamic, advanced dive with excellent visibility.