Destination snapshot
Best time
Nov–Apr (Similans)
Water temp
82–86°F
Visibility
60–100 ft
Skill level
All levels
Flight time (US)
Long-haul
Great for
Liveaboards · Training
Why visit
Similan Islands liveaboards for manta and whale shark encounters plus warm, easy reefs near Phuket & Koh Tao.
Thailand's Andaman coast delivers the Similan and Surin Islands (liveaboard only, Nov–Apr) for mantas and whale sharks, plus Phi Phi and Koh Tao for easy training and reef diving.
Best dive sites
- Richelieu Rock
- Koh Bon
- Elephant Head Rock
- Shark Point
Best snorkeling spots
- Similan Islands
- Phi Phi
What you may see underwater
Manta RaysWhale SharksSea TurtlesLeopard SharksFrogfishMacroCoral ReefsSchools of Fish
Interesting fact
The Similan Islands sit inside a marine park that closes annually from mid-May to mid-October — one of Southeast Asia's most protected reef systems.
Who this destination is best for
- New divers
- Backpackers
Frequently asked questions
- Similans or Koh Tao?
- Similans (Andaman) for pelagics and pristine coral; Koh Tao (Gulf) for cheap certifications and easy reef diving.
- When to dive Thailand?
- November–April Andaman side; year-round in the Gulf of Thailand.
- Whale sharks?
- Richelieu Rock is the classic waypoint, best March–April.
Ready to dive Thailand?
Tell us your dates and experience level — we'll match you with the right resort and operator, and handle the details.
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