Koh Nang Yuan offers a compact but varied diving landscape, mixing shallow beginner-friendly reefs with deeper pinnacles and the wreck of the HTMS Sattakut. Shore and boat entries serve everything from muck diving at Leamnamtok to the cavern system at Red Rock. The reef fish life is dense: Golden Butterflyfish, Longfin Bannerfish, Pink Skunk Clownfish and Bluespotted Fantail Ray are recorded across nearly every site. Whale Shark passes through occasionally, making deeper boat dives particularly rewarding.
Monthly water temperature across Koh Nang Yuan's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water stays warm throughout the year, rising to its peak around May and June before easing back through the second half of the year. March and September stand out as particularly favoured months based on diver activity patterns, suggesting calmer conditions and good visibility at those times. The range of site exposures means some spots are well sheltered even when conditions elsewhere are less settled.
67 operators
6 more sites to explore
Water temperature around Koh Nang Yuan ranges from about 28°C in January to 31°C in May, based on satellite sea-temperature data for its dive sites.
With water around 28–31°C, a rash guard or 3mm shorty works in Koh Nang Yuan year-round.
Fin maps 15 sites in Koh Nang Yuan (15 scuba diving sites and 3 snorkelling spots, with some suited to both).
Across Koh Nang Yuan's dive sites, March and September are most often reported as the best months to visit.
Reef fish are abundant across virtually all sites. Golden Butterflyfish, Longfin Bannerfish, Pink Skunk Clownfish and Wrasses are recorded at nearly every site, while Bluespotted Fantail Ray, Titan Triggerfish and Blue Ringed Angelfish are very commonly sighted. White Eyed Moray and Porcupinefish are regulars too, and Whale Shark has been observed on occasion at deeper sites.
The majority of sites are rated for beginner divers, including sheltered spots like Lighthouse Bay, Mango Bay and Sairee Reef, which offer shallow depths and mild currents. Shore entry is available at some sites, making independent access straightforward. Advanced divers have dedicated options too, notably Hin Pee Wee and the HTMS Sattakut wreck, which require greater depth experience.
Access varies by site. Leamnamtok and Sairee Reef are shore-entry dives, while deeper and more exposed sites such as Red Rock, Hin Pee Wee and the HTMS Sattakut wreck require a boat. Lighthouse Bay and Mango Bay offer both entry options. Coral Grand Divers is the local operator serving the area.
The site mix is notably varied. Pinnacle and reef combinations dominate, including Red Rock with its cave and cavern system. Mango Bay and Bio Rock feature artificial reef structures alongside natural reef. The HTMS Sattakut provides wreck diving, and Leamnamtok offers a muck diving experience, making Koh Nang Yuan a well-rounded destination for different diving styles.
