St John's Caves
Why dive here
St John's Caves is a cave dive where divers can encounter dolphins, humpback whales, oceanic whitetip sharks, sea turtles and spinner dolphins. Water ranges 23-31°C, warmest July, August, September.
St. John’s Caves, down in the St. John’s Reef system off Marsa Alam, offers a good mix of cavern diving without ever getting too tight. We’ve found the swim-throughs here are more like large, open tunnels that let in plenty of ambient light, making it suitable for divers comfortable in overhead environments but perhaps not ready for full-on cave diving. Keep an eye out for cowfish tucked into the corners, and if you’re really lucky, both long-beaked and bridled dolphins sometimes cruise through the area. It’s a site that rewards slower exploration, letting your eyes adjust to the interplay of light and shadow.
Safety Notes
Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.
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Conditions
Ocean conditions, forecast and tides for St John's Caves
St John's Caves Ocean Conditions
Monthly averages for St John's Caves, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (24.21, 35.56) (1km away)
October Averages
Sea Temperature
29°C
83°F · Range: 27.3–30°C
Current Speed
3.61 cm/s
Direction: SE (146.3°)
Chlorophyll-a
0.07 mg/m³
Very clear (oligotrophic)
Salinity
38.47 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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