Diving in Koh Samui
The Best Sites in the Gulf of Thailand
Samui Island has been welcoming visitors since the early 1970's and has developed into the most popular tourist destination on the east coast of Thailand.
The Gulf of Thailand is somewhat sheltered from the major oceans in the region and that protection gives the gulf a number of high quality dive sites which can be dived all year round. Chumphon Pinnacle and Sail Rock are the 2 most famous Koh Samui dive sites and their popularity with more experienced divers justifiably merits their place at the top of the gulf's best dive locations.
Many pelagic fish such as whale sharks are frequent visitors to the area. There are towering pinnacles, huge rock formations, colourful soft and hard corals, and sloping reefs. Schools of snapper and barracuda abound, and the area is famed for its turtles and triggerfish.
Most of the sites in the region are close to the famous island of Koh Tao and can be dived on full day trips out of Samui. Although most people would agree that the diving is better on Thailand's west coast, Koh Samui Island diving on the east coast still has access to some world class dive sites.
Samui will always be one of Thailand's favourite tourist destinations. With some excellent hotels and resorts, great beaches, the spectacular Ang Thong National Marine Park, and a mix of nightlife and quiet retreats, the island makes a fine place for a dive holiday, especially during the summer months when Phuket and the Similans are in low season.
• Koh Samui tourist information
• Map of Samui Island
Diving Season
You can dive the Koh Samui and Koh Tao diving spots year round, but the very best conditions exist from May to August, which is when the resort areas on the Andaman coast have their low season.
September to November brings the Northeast monsoon winds and surface swells to the islands, reducing visibility by about 30%. It's pretty rare that any Koh Samui diving trips are cancelled due to bad weather, but speedboat rides can be somewhat bouncy.
It can also be windy and wet in the Gulf from November to February so it may be better to go diving in Phuket, Phi Phi or the Similan Islands then.
Reef Basics
Great for: Small animals, beginner divers, value-for-money, snorkelling and non-diving activities
Not so Great for: Wrecks and drift dives
Depth: 5 - 40m
Visibility: 5 - 40m
Currents: Can be strong
Surface Conditions: Calm to moderate
Water Temperature: 27 - 29°C
Experience Level: Beginner - advanced
Number of dive sites: ~10
Access: Day trips from Koh Samui by speedboat
Recommended length of stay: 1 week
Dive Sites
More detailed information on some of the best Koh Samui dive sites:
Dive The World Recommendations: Chumphon Pinnacle and Sail Rock
Use our short form to grab your best options: Thailand scuba diving enquiries
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