Scuba diving in Thailand
2 dive regions in Thailand, each scored month by month for marine life, coral health, visibility, water temperature, currents and weather. Taken together, the diving here is at its best in February–April, but every region has its own season, so check the grid below before you book.
Also see: Indian Ocean · Indo-Pacific
Best time to dive in Thailand, region by region
Sorted by each region's best month
| Nov2026 | Dec | Jan2027 | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Similan IslandsThailand | 7.1 | 7.5 | 7.6 | 7.9 | 7.8 | 7.7 | 6.6 | 4.0 | 4.0 | 4.0 | 4.0 | 6.5 | 7.1 | 7.5 |
| Koh TaoThailand | 5.2 | 5.3 | 5.7 | 6.1 | 6.9 | 6.9 | 6.8 | 6.0 | 5.8 | 5.9 | 6.4 | 6.2 | 5.2 | 5.2 |
Overall score out of 10 with balanced priorities, from the current forecast.
Dive regions in Thailand
- Similan IslandsIndian Ocean
Peak season: December–April · Intermediate · Liveaboard, Day boat
Known for whale shark, manta ray, ghost pipefish, seahorses
- Koh TaoIndo-Pacific
Peak season: March–May, September · Beginner · Day boat, Resort
Known for whale shark, batfish, barracuda, blacktip reef shark