Rayong offers a varied mix of reef, pinnacle and wreck diving along Thailand’s eastern Gulf coast, with dive sites around Koh Samet and the surrounding islands. Discover local diving and start planning your next dive trip.
Rayong is one of Thailand’s lesser-known diving destinations on the eastern Gulf coast, offering coral reefs, underwater pinnacles and wreck diving. Dive sites are spread around Koh Samet and the surrounding islands, with offshore locations such as Alhambra Rock adding opportunities for more experienced divers.
Most diving is organised by boat, with sites ranging from sheltered reefs to deeper pinnacles and wrecks. This variety provides diving opportunities for different experience levels and makes Rayong an interesting alternative to some of Thailand’s busier diving destinations.
The main diving season in Rayong generally runs from October or November to April, when weather and sea conditions are typically more favourable. The dry-season months often bring calmer seas and better visibility, making this a popular period for exploring reefs, pinnacles and wrecks.
Conditions become more changeable during the southwest monsoon, particularly from May to September. Some local dive operations reduce or stop their offshore trips during this period, so it is worth checking current schedules and sea conditions when planning a dive trip outside the main season.
Water temperatures around Rayong remain warm and are generally around 27–31°C, depending on the season. Visibility varies considerably between locations and weather conditions, with offshore sites often providing better conditions than areas closer to the coast.
Conditions also vary between dive sites. Sheltered reefs can provide relatively relaxed diving, while offshore pinnacles may have stronger currents and greater depths. Alhambra Rock, also known as Hin Ploeng or the Rayong Pinnacles, rises from deeper water to within a few metres of the surface and is one of the area’s best-known offshore dive sites.
The waters around Rayong support a varied mix of tropical marine life. Divers can encounter colourful reef fish, barracuda, snapper, grouper, moray eels, nudibranchs, octopuses and cuttlefish, as well as turtles and other marine species around the reefs and islands.
Offshore pinnacles can attract large schools of fish, while reef and wreck sites provide habitats for smaller marine life. Larger species, including reef sharks and occasionally whale sharks, may also be encountered in the wider region, but sightings are never guaranteed.
Most diving in Rayong is organised through local dive centers, with boat trips visiting sites around Koh Samet, Koh Talu and the Koh Mun islands, as well as offshore pinnacles and wrecks. Alhambra Rock is one of the area’s best-known sites, while the HTMS Phetra adds a wreck-diving option to the region.
The variety of dive sites provides options for different experience levels, from shallower reef diving to deeper offshore locations. Travel times, currents and sea conditions can vary considerably between sites, so check current schedules and suitable dive sites with a local dive center when planning your diving days.
The main diving season in Rayong generally runs from October or November to April, when weather and sea conditions are typically more favourable. Calmer seas and better visibility often make these months the best period for exploring reefs, pinnacles and wrecks.
Diving may be possible outside the main season, but conditions become more changeable during the southwest monsoon. Some local dive operators reduce or stop trips from May to September, so it is important to check current schedules and sea conditions when planning your trip.
Yes. Rayong has sheltered reef sites suitable for less experienced divers, particularly around Koh Samet, while deeper offshore pinnacles and some wreck dives are better suited to divers with more experience and the appropriate certification.
Water temperatures around Rayong remain warm throughout the year and are generally around 27–31°C, depending on the season.
One of Rayong’s best-known dive sites is Alhambra Rock, also known as the Rayong Pinnacles or Hin Ploeng. Other diving areas include sites around Koh Samet, Koh Talu and the Koh Mun islands, while HTMS Phetra provides a wreck-diving option in Rayong Province.
Divers can encounter colourful reef fish, barracuda, snapper, grouper, moray eels, nudibranchs, octopuses, cuttlefish and turtles. Reef sharks and larger species may occasionally be encountered, particularly around offshore sites, but sightings are never guaranteed.
