Great Barrier Reef, Australia
    Annan River

    Rosser Reef

    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 - Rosser 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

    Rosser Reef is one of those places we always try to get back to if we’re in the area. It doesn’t scream for attention like some of the big-name sites, but it delivers consistent, beautiful diving, particularly if you appreciate coral architecture. We always find the staghorn coral formations here mesmerising, twisting upwards like intricate underwater cities. Swim through them and you might spot a well-camouflaged Coral Hawkfish perched, or a brilliant Citron Butterflyfish flitting past. What makes Rosser special is that feeling of being truly immersed in a healthy, thriving ecosystem. We've often spent an entire dive just exploring a single patch, discovering Gardiner's Headshield Slugs making their way across a colony of Cactus Coral, or watching Small Giant Clams snap shut as you pass. It’s not about big pelagics here, though you never know what might cruise by. It's about the detailed tapestry of reef life. We’d suggest going in the morning; the light filtering through the water really brings out the colours of the corals and makes those schools of fusiliers glimmer. Rosser Reef is perfect for divers who love to take their time, appreciate the smaller wonders, and truly soak in the health of the Great Barrier Reef.

    Safety Notes

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

    Today05:5418:1712h 22m daylightGolden hour 17:48

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    Conditions

    Ocean conditions, forecast and tides for Rosser Reef

    Rosser Reef Ocean Conditions

    Monthly averages for Rosser 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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