Koh Tachai
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 offers some of Similan Islands's richest diving. Water ranges 29-31°C, warmest April, May, June.
Koh Tachai Plateau is usually a stop on the way to Richelieu Rock, and it’s a good one. It’s a submerged plateau, mostly hard corals and big boulders, riddled with swim-throughs and channels. We’ve had some incredible luck here with schools of chevron barracuda, thick enough to dim the light, and always a good chance to spot tuna zipping by. If you’re lucky, manta rays cruise through, and the occasional whale shark decides to pay a visit when they're not up north. The currents can get serious, so it’s best for experienced divers.
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Conditions
Ocean conditions, forecast and tides for Koh Tachai
Koh Tachai Ocean Conditions
Monthly averages for Koh Tachai, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.1, 98.3) (6km away)
October Averages
Sea Temperature
30°C
85°F · Range: 28.7–30.4°C
Current Speed
5.1 cm/s
Direction: S (191.3°)
Salinity
29.75 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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