Main Cay Reef
Why dive here
With 154+ marine species recorded in the area - including hammerhead sharks, sea turtles, tiger sharks and napoleon wrasse - Main Cay Reef offers some of Great Barrier Reef's richest reef diving. Water ranges 24-30°C, warmest January, February, March.
Main Cay Reef is a solid coral reef dive on the Great Barrier Reef. You'll generally find good hard coral formations and a decent scattering of reef fish. We've seen a few green turtles grazing here too. It’s a good choice for newer divers or those looking for a relaxed, easy dive.
Typical Main Cay Reef Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Strong currents typical this month (avg 30 cm/s). Good buoyancy control essential.
Reviews for Main Cay Reef
Conditions
Ocean conditions, forecast and tides for Main Cay Reef
Main Cay Reef Ocean Conditions
Monthly averages for Main Cay Reef, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (-15.65, 145.72) (5km away)
October Averages
Sea Temperature
26°C
80°F · Range: 24.5–29°C
Current Speed
30.07 cm/s
Direction: S (183.8°)
Chlorophyll-a
0.057 mg/m³
Very clear (oligotrophic)
Salinity
35.08 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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