Koh Tachai Reef

Best months: Jan–May

Protected Area

Mu Ko Similan

Why dive here

With 173+ marine species recorded in the area - including blacktip reef sharks, eagle rays, giant moray eels, whale sharks and clownfish - Koh Tachai Reef offers some of Similan Islands's richest reef diving. Water ranges 29-31°C, warmest April, May, June.

Best timeJan–May

WetsuitA 3mm shorty or thin full wetsuit

Marine lifeBlacktip Reef Sharks, Eagle Rays, Giant Moray Eels, Whale Sharks and Clownfish · 173+ species recorded

Water29-31°C · warmest April, May, June

CharacterReef dive · max 18m

StandoutExceptional marine biodiversity

Koh Tachai Reef, not to be confused with the Tachai Pinnacle, offers a gentler introduction to the Similans' underwater world. It’s mostly a sloping coral garden, perfect for those newer to diving or looking for a relaxed afternoon. We’ve drifted along here, spotting schools of yellow-stripe snapper darting between the brain corals, and often found a grumpy stonefish doing its best impression of a rock. Keep an eye out for the occasional reef shark cruising in the distance; it’s a calm backdrop for a first-time Similan dive.

Typical Koh Tachai Reef Dive Profile

Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.

Safety Notes

Always perform a 3-minute safety stop at 5m before surfacing.

Today06:1718:1511h 58m daylightGolden hour 17:47

Reviews for Koh Tachai Reef

Conditions

Ocean conditions, forecast and tides for Koh Tachai Reef

Koh Tachai Reef Ocean Conditions

Monthly averages for Koh Tachai Reef, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.1, 98.3) (6km away)