DivePlnr
    Castle Rock dive site
    reef
    15-20m
    Victoria, Australia
    Port Phillip Heads

    Castle Rock

    Best months: Jan–Mar

    Protected Area

    Port Phillip Heads

    Why dive here

    With 129+ marine species recorded in the area - including blue sharks, blue whales, dolphins, dwarf minke whales and great white sharks - Castle Rock offers some of Victoria's richest reef diving. Water ranges 13-20°C, warmest January, February, March.

    Best timeJan–Mar
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Blue Whales, Dolphins, Dwarf Minke Whales and Great White Sharks · 129+ species recorded
    Water13-20°C · warmest January, February, March
    CharacterReef dive · max 15-20m
    StandoutRich in charismatic marine life

    Castle Rock is located outside the Port Phillip Heads in approximately 18 metres of water. It sits on a sandy bottom and rises to around 12 metres. The rock is around 200m in circumference, has many overhangs, walls and swimthroughs, and can be circled several times in a dive. Maximum depth: 18m. Average visibility: 12m. The fixed depth, lack of current and easy navigation make this the perfect dive for newer Open Water divers.

    Typical Castle Rock Dive Profile

    5m10m15mSafety Stop0m15m max~50 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

    Cold water this month (avg 15°C). Drysuit or thick wetsuit (7mm+) recommended.

    Always perform a 3-minute safety stop at 5m before surfacing.

    Today05:4318:3512h 52m daylightGolden hour 18:00

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    Conditions

    Ocean conditions, forecast and tides for Castle Rock

    Castle Rock Ocean Conditions

    Monthly averages for Castle Rock, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (-38.3, 144.7) (0km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    15°C

    58°F · Range: 13.4–16.3°C

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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