Poor Knights Islands, New Zealand
    Poor Knights Islands

    Serpent Rock

    Best months: Jan–Apr

    Protected Area

    Poor Knights Islands

    Why dive here

    With 79+ marine species recorded in the area - including blue sharks, dolphins, hammerhead sharks, humpback whales and orcas - Serpent Rock offers some of Poor Knights Islands's richest reef diving. Water ranges 15-22°C, warmest January, February, March.

    Best timeJan–Apr
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Dolphins, Hammerhead Sharks, Humpback Whales and Orcas · 79+ species recorded
    Water15-22°C · warmest January, February, March
    CharacterReef dive
    StandoutRich in charismatic marine life

    Serpent Rock is one of our favourite Poor Knights spots, especially when a bit of surge rolls through. It’s an oddly shaped island above water, but underwater, the magic really happens. We love dropping down onto those steep, encrusted walls. They’re absolutely packed with life, from tiny nudibranchs, if you’ve got the eyes for them, to the chunky scorpionfish just blending in. The trick here is to not get too tunnel-visioned on the wall. Take a moment, turn around, and look out into the blue. That’s where the real show often unfolds. We’ve seen incredible shoaling action, schools of yellowtail or mackerel, with kingfish or even a marlin ghosting in from the depths. Finding that pressure point where the currents meet is key; that’s where the hunters gather. Max depth is around 20 metres, so it’s a site most divers can comfortably explore. It’s perfect for those who appreciate both macro life and the chance of spotting pelagics, especially when the visibility is good.

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    Conditions

    Ocean conditions, forecast and tides for Serpent Rock

    Serpent Rock Ocean Conditions

    Monthly averages for Serpent Rock, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (-35.84, 174.61) (14km away)

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    October Averages

    Sea Temperature

    16°C

    60°F · Range: 14.8–17.1°C

    Current Speed

    11.4 cm/s

    Direction: SE (142.1°)

    Chlorophyll-a

    0.388 mg/m³

    Moderate productivity

    Salinity

    35.44 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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