Sudbury Reef
Protected Area
Trinity Inlet
Why dive here
With 154+ marine species recorded in the area - including hammerhead sharks, sea turtles, tiger sharks and napoleon wrasse - Sudbury Reef offers some of Great Barrier Reef's richest reef diving. Water ranges 24-30°C, warmest January, February, March.
Sudbury Reef, for us, is a sleeper hit out on the Great Barrier. It’s not one of the big names, which is precisely why we love it. The coral here feels less… manicured, more natural, with some sprawling formations that really give you a sense of scale. Down deeper, around the 15-20 metre mark, we’ve often found ourselves drifting past enormous brain corals, their surfaces rippling with subtle shifts in light. Keep an eye out for the Harlequin Tuskfish – their colours are ridiculously vibrant against the more muted corals. We’ve had fantastic luck spotting Pharaoh Cuttlefish here too, especially in the late afternoon; their skin rippling with patterns as they size you up is always a treat. If you’re into the smaller, more unusual stuff, definitely spend some time scanning the sandy patches for the Bigtooth Twinspot Flounder. It’s a great site for divers who appreciate a quieter reef experience, away from the bigger tour boats, and who enjoy patiently searching for unique critters. It offers a genuine taste of the GBR without feeling like a theme park.
Safety Notes
Strong currents typical this month (avg 30 cm/s). Good buoyancy control essential.
Nearest Dive Centres to Sudbury Reef
Dive shops near Sudbury Reef
Octopus Dive
Horseshoe
Dive Centre
Reef Daytripper
Tusa Dive
Pro Dive Cairns
Reviews for Sudbury Reef
Conditions
Ocean conditions, forecast and tides for Sudbury Reef
Sudbury Reef Ocean Conditions
Monthly averages for Sudbury 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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