Koh Pha Ngan sits in the Gulf of Thailand and offers diving across reefs, pinnacles, and artificial structures within and around Ang Thong Marine Park. Water stays warm throughout the year, peaking in late spring and dropping slightly in the cooler months. The sites here skew shallow and beginner-friendly, with depths ranging from very shallow shore entries to around thirty metres at the deeper pinnacle sites. Visibility is variable and can be limited by sediment, so conditions reward those who time visits carefully. The site mix includes fringing reefs, scattered coral gardens, and artificial structures, with reef fish such as batfish, parrotfish, trevally, and groupers recorded across multiple sites.
Monthly water temperature across Koh Pha Ngan's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperature stays warm year-round, peaking in late spring and remaining comfortable through the wet season. The dry season from December to June tends to bring more settled conditions, though visibility varies considerably across sites and can drop noticeably in sheltered bays.
Water temperature around Koh Pha Ngan 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 Pha Ngan year-round.
Fin maps 7 sites in Koh Pha Ngan (7 scuba diving sites and 2 snorkelling spots, with some suited to both).
2 more sites to explore
