DivePlnr
    Crack a Jack dive site
    reef
    5-20m
    Great Barrier Reef, Australia

    Crack a Jack

    Best months: Feb–Mar

    Why dive here

    With 154+ marine species recorded in the area - including hammerhead sharks, sea turtles, tiger sharks and napoleon wrasse - Crack a Jack 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 · max 5-20m
    StandoutExceptional marine biodiversity

    Crack a Jack offers a straightforward dive, popular for its dependable resident marine life. We often find schools of sweetlips hanging around the bommies and the occasional reef shark patrolling the deeper sections. It’s a good choice for divers looking for relaxed conditions and a solid chance to spot some larger fish, without too much current to contend with.

    Typical Crack a Jack Dive Profile

    5mSafety Stop0m5m max~60 min estimated bottom time

    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.

    Today05:5318:1612h 22m daylightGolden hour 17:47

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    Conditions

    Ocean conditions, forecast and tides for Crack a Jack

    Crack a Jack Ocean Conditions

    Monthly averages for Crack a Jack, 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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