...Good for: Large animals, beginner divers, value-for-money and snorkelling...
...Not so good for: Wrecks and drift dives...
'Turtle Island' (as the name 'Koh Tao' means in English) has long been a magnet for backpackers and traveller types who want learn about scuba diving. The many shallow bays are used to certify more PADI student divers than anywhere else in the world outside of Australia. Show more
Ao Leuk - This shallow bay's easy, relaxing diving is strongly recommend for beginners or for scuba divers that haven't got wet for a while. The Thai name means 'Deep Bay' which is something of a misnomer since it is one of the shallowest of Koh Tao's dive sites, with its sandy bottom allowing a maximum depth of only 12-14 metres. There are a surprising amount of reef fish for such a location, such as butterflyfish and angelfish, schools of juvenile yellowtail barracuda and turtles. Show more
All the sites can be visited on day trips from Samui Island. For more information on these options, and all the other travel information you might need to visit Samui and Thailand, read our:
Dive boats depart every morning, normally in quite small groups. You will normally return at 5:00 pm in the early evening. You can book dive day trips only, or combine them with accommodation at one of our recommended Koh Samui resorts.
The dive sites around Koh Tao can be visited throughout the year. The water is an average temperature of 28-29°C. However, the best season for optimum conditions is from March to September, with the busiest months being July and August. The weather during this period is warm and usually sunny, offering the best conditions for diving, especially in terms of underwater visibility.
Monsoon winds reduce visibility from October to November, and sea swells can be present. However, these are rarely bad enough to interfere with the running of diving trips. November to February brings rain and winds to Koh Tao so it is not be the best place to be at this time of year.
There is a chance to see big pelagics such as whale sharks, most often in September, but the possibility remains all year around. Titan triggerfish might become aggressive during their breeding season which usually runs from March to April, as they are extremely territorial. The male usually guards the nest against intruders, including scuba divers. They are only following their instincts and divers should avoid getting inside their 'protection zone' (above the nest, as the titans can see upwards).
A positive aspect of Koh Tao is that, being a small island, it is possible to travel around it by boat in less than an hour, visiting the best dive sites that each day has to offer, in terms of conditions and marine sightings. Additionally, Koh Tao's small landmass means that growing rain clouds most often unleash their rains over the larger neighboring islands of Samui, Phangan or the Thai mainland.
Review our map below of Thailand, showing the location of Koh Tao. Here, you will find information on how to get to Koh Samui, from where you will dive at Koh Tao.
Depth: 5 - 35m
Visibility: 5 - 20m
Currents: Usually gentle but can be strong at some sites
Surface conditions: Normally calm, but can be choppy offshore
Water temperature: 27 - 30°C
Experience level: Beginner - intermediate
Number of dive sites: ~15
Recommended length of stay: 5 days