Crystal Bay Koh Samui
Protected Area
Mu Ko Ang Thong Marine National Park
Why dive here
With 158+ marine species recorded in the area - including blacktip reef sharks, blue-spotted stingrays, mobula rays (devil rays), whale sharks and pufferfish - Crystal Bay Koh Samui offers some of Gulf of Thailand's richest reef diving. Water ranges 28-31°C, warmest April, May, June.
Crystal Bay, off Koh Samui, is a gentle spot, perfect if you’re just getting comfortable in the water or fancy an easy afternoon dive. We’ve found the maximum depth rarely pushes past 20m, making it a relaxed profile. You’ll drift over a decent coral reef, home to a scattering of resident damselfish, small wrasse, and occasionally a shy moray eel peeking from a crevice. It’s not a big pelagic show, but it’s a calm, pretty dive, ideal for knocking out a few training dives or simply unwinding beneath the surface. Expect easy conditions and generally mild currents.
Typical Crystal Bay Koh Samui 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 20m - Advanced Open Water certification recommended.
Always perform a 3-minute safety stop at 5m before surfacing.
Nearest Dive Centres to Crystal Bay Koh Samui
Dive shops near Crystal Bay Koh Samui
Thai Scuba Dive
Silent Divers
Samui Discovery Divers, Co Ltd
Samui Diving Resort
Puffer Divers
Phangan Divers
Reviews for Crystal Bay Koh Samui
Conditions
Ocean conditions, forecast and tides for Crystal Bay Koh Samui
Crystal Bay Koh Samui Ocean Conditions
Monthly averages for Crystal Bay Koh Samui, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (10.15, 99.7) (6km away)
October Averages
Sea Temperature
30°C
86°F · Range: 29.1–31°C
Air Temperature
27°C
81°F
Wind Speed
4.83 m/s
9.4 knots
Atmospheric Pressure
1009.7 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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