Koh Tang sits in the Gulf of Thailand, roughly four to five hours by boat from Sihanoukville, and all nine sites here are reached by boat only. The island offers a varied mix of reef, drift, cave, and artificial reef diving across a depth range that suits beginners through to advanced divers. Sites such as Fly By at the northern tip run strong currents, while shallower options like The Steps and Atlantis suit newer divers. Expect to find whip and fan corals, staghorn formations, nudibranchs, batfish, barracuda, and occasional silvertip sharks and sea turtles. Night dives extend the experience, with stingrays and octopus among the after-dark highlights.
Monthly water temperature across Koh Tang's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperature stays warm year-round, rising slightly in late spring and early summer. The dry season from November to April generally brings the most settled conditions and the best visibility, which can reach thirty metres on a good day. Outside that window, monsoon weather can affect boat access and reduce visibility noticeably.
1 operator
Water temperature around Koh Tang ranges from about 29°C in January to 31°C in May, based on satellite sea-temperature data for its dive sites.
With water around 29–31°C, a rash guard or 3mm shorty works in Koh Tang year-round.
Fin maps 9 sites in Koh Tang (9 scuba diving sites and 1 snorkelling spots, with some suited to both).
