William Reef
Protected Area
Mitirinchi Island
Why dive here
With 154+ marine species recorded in the area - including hammerhead sharks, sea turtles, tiger sharks and napoleon wrasse - William Reef offers some of Great Barrier Reef's richest reef diving. Water ranges 24-30°C, warmest January, February, March.
William Reef offers a straightforward dive on a classic Great Barrier Reef coral system. You'll likely encounter a good variety of the usual reef fish - think parrotfish, wrasse, and small schooling fish flitting amongst the corals. It’s a solid pick for those looking for a relaxed, easygoing dive without any major challenges. We’d suggest it for divers who appreciate consistent reef health and a predictable experience.
Typical William 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 William Reef
Conditions
Ocean conditions, forecast and tides for William Reef
William Reef Ocean Conditions
Monthly averages for William 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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