Conditions referenceSeason, water and visibilityBest Apr–Sep · Mild current · 26–30°C (coldest Dec, warmest Apr)
- Current
- Mild
- Water temperature
- 26–30°C (coldest Dec, warmest Apr)
- Visibility
- 10–30m: Typically 10–25m; often clearer (up to 30m+) in September–October, and reduced by plankton and monsoon runoff in November–December.
- Experience
- Beginner-friendly: this is primarily a training island, and most reef sites suit Open Water level.
01 · Marine life
What you may see
Sightings are never guaranteed. The bars show typical likelihood by month.
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | commonly seen |
| September | commonly seen |
| October | commonly seen |
| November | commonly seen |
| December | commonly seen |
Reliable year-round in shallow bays such as Shark Bay, Aow Leuk and Hin Wong.
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | commonly seen |
| September | commonly seen |
| October | commonly seen |
| November | commonly seen |
| December | commonly seen |
Bright yellow schools are a constant on Koh Tao's reefs and around the pinnacles, a common backdrop on most dives.
| Month | Likelihood |
|---|---|
| January | commonly seen |
| February | commonly seen |
| March | commonly seen |
| April | commonly seen |
| May | commonly seen |
| June | commonly seen |
| July | commonly seen |
| August | commonly seen |
| September | commonly seen |
| October | commonly seen |
| November | commonly seen |
| December | commonly seen |
A steady macro subject across the reefs; many species present year-round, popular on training and photography dives.
| Month | Likelihood |
|---|---|
| January | rare |
| February | rare |
| March | occasional |
| April | occasional |
| May | occasional |
| June | rare |
| July | rare |
| August | rare |
| September | occasional |
| October | occasional |
| November | rare |
| December | rare |
The island's headline draw and a real reason people come, but sightings are sporadic and never guaranteed.
02 · Dive sites
Dive sites worth knowing
A starting point, not a ranking. Conditions decide what works on the day.
Chumphon Pinnacle
A big granite pinnacle about 11km northwest of Koh Tao, top around 14m and dropping past 30m.
14–36m · Moderate current
Japanese Gardens
A shallow, sheltered hard-coral reef beside Koh Nang Yuan, a staple training and check-out site with easy conditions and reliable reef life.
2–12m · Mild current
Sail Rock (Hin Bai)
A granite pinnacle rising ~15m above the surface and dropping to ~40m, roughly midway between Koh Tao and Koh Phangan.
5–30m · Moderate current
See all 6 dive sites
03 · LogisticsGetting there and costsModerate. Fly to USM. Typical trip $.
Route overview
Moderate
Reachable but with some friction: 1 domestic flight, a 2h boat crossing.
Airport options
USM
Samui Airport (Koh Samui)
Fly into Koh Samui, transfer to Nathon/Maenam pier, then a high-speed ferry to Koh Tao (~1.5–2h). Most common route; Koh Tao has no airport.
URT
Surat Thani Airport (mainland)
Cheaper mainland airport; combined bus-and-ferry to Koh Tao runs roughly 4–5h via Donsak/Surat piers, Koh Samui and Koh Phangan.
Typical trip cost
$
under $2,000
Per person, excluding international flights.
- Among the cheapest diving anywhere.
- A PADI/SSI Open Water course is commonly around 11,000 THB (~$300), with most reputable shops holding an informal same-price agreement; fun dives run roughly 1,000 THB (~$30) each or less in packages.
- Budget guesthouse accommodation and food are inexpensive, so a week of diving plus a room lands well under $2k excluding flights.
- Sail Rock and other full-day pinnacle trips cost extra.