DivePlnr
    Williamson Reefs dive site
    reef
    Great Barrier Reef, Australia
    Annan River

    Williamson Reefs

    Best months: Feb–Mar

    Protected Area

    Annan River

    Why dive here

    With 154+ marine species recorded in the area - including hammerhead sharks, sea turtles, tiger sharks and napoleon wrasse - Williamson Reefs 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

    Williamson Reefs is a solid dive, a good example of the inner Great Barrier Reef. You’ll find a mix of hard corals, with plenty of nooks and crannies for things like Spitlure Frogfish if you have a keen eye, or the resident Grouper. We often spot schools of Yellowstripe Scad moving around the bommies. It’s a pleasant, relaxed dive, well-suited for a calm morning when you’re looking to log some bottom time and appreciate the smaller details.

    Safety Notes

    Strong currents typical this month (avg 30 cm/s). Good buoyancy control essential.

    Today05:5418:1612h 22m daylightGolden hour 17:48

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    Conditions

    Ocean conditions, forecast and tides for Williamson Reefs

    Williamson Reefs Ocean Conditions

    Monthly averages for Williamson Reefs, 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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