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2026 Thailand diving guide — Similan Islands liveaboards, Koh Tao certification, Phi Phi day trips and the best Andaman Sea dive sites ranked by experience level.
Thailand remains one of the world’s most accessible diving destinations. Whether you’re a complete beginner getting your first PADI open water certification or an experienced diver planning a Similan Islands liveaboard, Thailand’s warm waters, diverse marine life, and well-established dive infrastructure make it a reliable choice year after year.
Key Diving Areas
Similan Islands (October-May only): Thailand’s premier dive destination, closed June-September for monsoon season. Crystal-clear visibility (30-50m), granite boulder formations, whale sharks (Nov-Feb), and manta rays. Liveaboard trips (2-3 nights) are the best way to experience the full Similan archipelago.
Koh Tao: The world’s most famous budget dive certification location. PADI Open Water runs $250-350 (vs $500+ in the West). Koh Tao has 50+ dive shops, a relaxed backpacker vibe, and easy boat access to nearby dive sites.
Phi Phi Islands: Day trip friendly, good for snorkelers and beginner divers. Maya Bay (now managed with daily visitor limits) is still worth the early morning visit.
Richelieu Rock (Andaman Sea): Consistently rated one of the best dive sites in the world for macro marine life and pelagic encounters. Best accessed via liveaboard from Khao Lak.
2026 Season Notes
- Similan Islands liveaboards: November-May (best conditions January-April)
- Gulf of Thailand (Koh Tao, Samui): Best March-May (flat seas, clear water)
- Phuket/Andaman: Best December-April ( monsoon affects May-November)
[Book Similan Islands liveaboard dives on Klook]
Certification and Costs
| Course | Thailand Cost | Western Cost |
|---|---|---|
| PADI Open Water | $250-350 | $500-700 |
| Advanced Open Water | $200-300 | $400-500 |
| Fun Dive (2 tanks) | $50-80 | $100-150 |
Koh Tao is the world’s dive certification capital. Most people spend 3-4 days getting certified, then spend another week diving to consolidate skills.
What to Bring
- Dive certification card (or digital copy)
- Reef-safe sunscreen (mandatory at many sites)
- Dive logbook
- Underwater camera (rent or bring your own GoPro)
[Book Thailand diving day trips on Tiqets]
Internet: Airalo Thailand eSIM 8GB for $12. Yesim Asia plan covers Thailand too, $15/10GB.
Thailand diving is about the combination of accessibility and quality that’s hard to match anywhere else on earth.
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