Racha Yai, Siam Bay
Protected Area
กำหนดพื้นที่เกาะราชาใหญ่ เกาะราชาน้อย ตำบลราไวย์ อำเภอเมืองภูเก็ต จังหวัดภูเก็ต
Why dive here
With 173+ marine species recorded in the area - including blacktip reef sharks, eagle rays, giant moray eels, whale sharks and clownfish - Racha Yai, Siam Bay offers some of Similan Islands's richest reef diving. Water ranges 29-31°C, warmest April, May, June.
Siam Bay on Racha Yai is a gentle introduction to diving in the region, particularly good for those just getting started or brushing up their skills. Dropping to a maximum of 14 metres, it's a sheltered spot with a sandy bottom and scattered coral bommies. You'll often find a decent assortment of reef fish here: parrotfish chomping away, small groups of snapper, and sometimes a blue-spotted stingray resting on the sand. It’s a comfortable, easy dive, perfect for getting reacquainted with your buoyancy without any tricky currents to worry about.
Typical Racha Yai, Siam Bay 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.
Nearest Dive Centres to Racha Yai, Siam Bay
Dive shops near Racha Yai, Siam Bay
Aquasub
Tommy’s Dive Center Phuket
Aum Scuba
Amazing Phuket adventures
Local Dive Thailand
Nama Freediving Phuket
Reviews for Racha Yai, Siam Bay
Conditions
Ocean conditions, forecast and tides for Racha Yai, Siam Bay
Racha Yai, Siam Bay Ocean Conditions
Monthly averages for Racha Yai, Siam Bay, 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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