Great Barrier Reef, Australia
    Trinity Inlet

    Sudbury Reef

    Best months: Feb–Mar

    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.

    Best timeFeb–Mar
    WetsuitNo wetsuit needed, or a rash guard
    Marine lifeHammerhead Sharks, Sea Turtles, Tiger Sharks and Napoleon Wrasse · 154+ species recorded
    Water24-30°C · warmest January, February, March
    CharacterReef dive
    StandoutExceptional marine biodiversity

    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.

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    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)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    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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