Koh Tao

Koh Tao, often hailed as the diving capital of Southeast Asia, is a small island in the Gulf of Thailand renowned for its vibrant underwater world and as a global hub for scuba certifications. With 27 dive sites surrounding the island, it offers an incredible variety of environments, from shallow coral gardens teeming with colourful reef fish to deeper granite pinnacles and even a few wrecks. Its reputation is built on accessible, sheltered bays perfect for training, alongside more challenging sites that attract experienced divers, making it a uniquely versatile destination.

Diving conditions in Koh Tao are generally excellent year-round, with warm tropical waters and good visibility. The island's protected location ensures calm seas for most of the year, providing a comfortable and safe environment for all skill levels. Divers flock here not just for the affordable courses but for the rich marine biodiversity, which includes everything from turtles and moray eels to the occasional, awe-inspiring whale shark. This combination of accessibility, affordability, and exciting marine encounters makes Koh Tao an essential stop for any diver exploring Thailand.

Top Sites

Frequently Asked Questions

What's the most popular dive site in Koh Tao, Thailand?
Chumphon Pinnacle is arguably the most popular and celebrated dive site in Koh Tao, Thailand. It's a massive granite pinnacle located offshore, attracting experienced divers. Its popularity stems from the high chance of seeing larger pelagics like whale sharks (in season), giant groupers, and huge schools of barracuda and trevally. The vibrant coral and anemone coverage makes it a visually stunning deep dive that showcases the best of the Gulf of Thailand's marine life.
What are the good and less popular dive sites in Koh Tao, Thailand?
Well-known sites in Koh Tao, Thailand, include Chumphon Pinnacle, Sail Rock, and Southwest Pinnacle for their pelagic action. For something less crowded but equally impressive, try Green Rock for its unique swim-throughs and triggerfish encounters, or Hin Wong Pinnacle for its beautiful soft corals and macro life. Laem Thian is another great, quieter option offering caves and frequent turtle sightings. These hidden gems provide a more serene diving experience away from the main crowds.
What water temperature is it like throughout the year diving in Koh Tao, Thailand?
Water temperatures in Koh Tao, Thailand, are warm and tropical all year. They typically range from 26-28°C (79-82°F) during the cooler months of December and January. From March to September, the water warms up considerably, averaging a balmy 29-31°C (84-88°F). This consistent warmth makes diving comfortable at any time of year, with only minor fluctuations between seasons.
When is the best time to visit Koh Tao, Thailand?
The best time to dive in Koh Tao, Thailand, is from February to September when conditions are optimal with calm seas and excellent visibility. March, April, and May offer the warmest water and flattest seas. The shoulder months of July to September are also great. The main monsoon season runs from October to December, which can bring wind and reduced visibility, though diving is still possible on sheltered sites. Whale shark season is best from March to May and September to October.
What's the visibility like during the dive season in Koh Tao, Thailand?
During the prime dive season in Koh Tao, Thailand (February to September), underwater visibility is generally very good, often ranging from 15 to 30 meters (50-100 feet), especially at offshore sites like Chumphon Pinnacle. In the monsoon season (October to December), visibility can drop to 5-10 meters due to runoff and rougher seas. However, even during this period, sheltered bays on the island can still offer decent conditions for diving and training.
Are there any seasonal migrations or special events (e.g., manta rays, whale sharks) in Koh Tao, Thailand?
Yes, Koh Tao, Thailand, is famous for its seasonal whale shark sightings. While they can appear any time, the peak seasons are typically March-May and September-October, coinciding with plankton blooms. These gentle giants are most frequently spotted at deeper sites like Chumphon Pinnacle and Sail Rock. Manta ray sightings are much rarer here compared to other parts of Thailand. The island also experiences turtle nesting season on some of its beaches.
What marine life can I expect to see in Koh Tao, Thailand?
Diving in Koh Tao, Thailand, you'll see abundant reef life including moray eels, blue-spotted stingrays, angelfish, butterflyfish, and parrotfish. Larger species are common, such as hawksbill and green turtles, great barracudas, and giant groupers. At deeper pinnacles, look for schools of trevally and fusiliers. Lucky divers might also encounter the majestic whale shark, particularly during peak season. Macro life like nudibranchs and shrimps can also be found by keen-eyed divers.
What thickness wetsuit should I wear in Koh Tao, Thailand?
Given the warm water temperatures year-round in Koh Tao, Thailand, a wetsuit is often optional. Many divers are comfortable in just a rash guard and shorts. For those who get cold easily or for multiple dives, a 3mm shorty wetsuit is more than sufficient for the warmest months (March-September). During the slightly cooler period from December to February, a full-length 3mm wetsuit provides perfect thermal protection without being restrictive.
How do I get to Koh Tao, Thailand?
To reach Koh Tao, Thailand, you must take a ferry. The nearest airports are on the neighboring island of Koh Samui (USM) or on the mainland at Surat Thani (URT) and Chumphon (CJM). From any of these locations, you can take a high-speed catamaran or ferry directly to Koh Tao. The ferry journey typically takes between 1.5 to 3 hours depending on the departure point and vessel type. Book ferry tickets in advance, especially during peak season.
Should I book a liveaboard or stay on shore in Koh Tao, Thailand?
Shore-based diving is the standard and recommended option for Koh Tao, Thailand. The island is small, and all 27 dive sites are easily accessible via short day trips on a longtail or dive boat. This allows you to enjoy the island's vibrant culture, restaurants, and beaches after your dives. Liveaboards are not common or necessary for exploring Koh Tao itself, as they are better suited for more remote, spread-out destinations.
All Dive Sites in Koh Tao (27)
Alotmeant Coral Restoration ProjectAow LeukBans Artificial ReefBuoyancy WorldChumphon PinnacleGreen RockHin NgamHin Pee WeeHin Wong BayHin Wong PinnaclesHtms SattakutJapanese GardensJunkyard ReefKoh TaoLaem ThienLighthouse BayMango BayNo NamePotteryRed RockSam LaemShark IslandSouthwestSouthwest PinnacleTanote BayTwinsWhite Rock