Koh Rang is a reef-dominated diving area within the Koh Chang region, where the vast majority of sites suit beginners and are reached exclusively by boat. Shallow coral gardens give way to rockier terrain at sites like Hin ao yai, the one intermediate pinnacle and drift dive in the mix. Resident species include the Pink Skunk Clownfish, Blue Ringed Angelfish, and Coral Trout, while occasional Whale Shark sightings add an element of surprise. Conditions are warmest from April through May.
Monthly water temperature across Koh Rang's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperature stays warm throughout the year, with a slight peak across the mid-year months and a mild dip toward the cooler end in January and February. The best-months data points firmly to November through April as the prime window, when visibility tends to be at its clearest. From May onward, conditions become less reliable, and fewer operators log favourable dives through the mid-year period.
17 operators
2 more sites to explore
Water temperature around Koh Rang ranges from about 29°C in January to 31°C in April, 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 Rang year-round.
Fin maps 11 sites in Koh Rang (11 scuba diving sites and 3 snorkelling spots, with some suited to both).
Across Koh Rang's dive sites, February, March, April and November are most often reported as the best months to visit.
The reefs support a rich and well-observed cast of species. Blue-barred Parrotfish, Moon Wrasse, Coral Trout, and Indo-Pacific Sergeant Major are seen across virtually every site. Lionfish and White Eyed Moray are regularly recorded, and the Blue Ringed Angelfish is a signature species here. Whale Shark sightings are occasional but have been observed, making them a real possibility rather than a mere hope.
Koh Rang is well suited to beginners, with the large majority of sites rated at entry level. Sites such as Banana Bay, Ao Tum, and Anemone Life offer shallow reef dives with mild currents. The one exception is Hin ao yai, a submerged pinnacle with deeper reaches and drift potential, which is rated intermediate and better suited to more experienced divers.
Boat access is the norm for diving in Koh Rang, with almost all sites reachable only by boat. A small number of sites, including Ao Tum and Ao Kluai, also permit shore entry for those who prefer it. Operators including Paradise Divers, BB Divers, and Koh Kood Divers run trips to the area.
Most diving in Koh Rang takes place on coral reef gardens at moderate depths, making the area coherent and accessible for newer divers. Koh Reath adds an artificial reef element, with underwater statues providing additional structure and habitat. Hin ao yai stands apart as the only pinnacle and drift site, dropping considerably deeper and offering a more challenging profile for those ready to step beyond the standard reef dives.
