Koh Tachai, Ao Yai

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, Ao Yai offers some of Similan Islands's richest 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

Charactermax 21m

StandoutExceptional marine biodiversity

Ao Yai, on the eastern side of Koh Tachai, is a pretty straightforward dive, especially for those just starting out in the Similans. We often see giant trevally patrolling the deeper sandy patches, and if you keep an eye on the smaller bommies, you'll likely spot some moray eels tucked away. The site depth maxes out around 21m, making it comfortable for beginners to spend some decent bottom time. It's a relaxed spot, good for getting your buoyancy dialed in without too much current to worry about.

Typical Koh Tachai, Ao Yai Dive Profile

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

Safety Notes

Depth of 21m - Advanced Open Water certification recommended.

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

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

Reviews for Koh Tachai, Ao Yai

Conditions

Ocean conditions, forecast and tides for Koh Tachai, Ao Yai

Koh Tachai, Ao Yai Ocean Conditions

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