Poor Knights Islands, New Zealand
    Poor Knights Islands

    Southern Arch

    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 - Southern Arch 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

    Southern Arch is one of those places you feel before you even splash. The rock itself juts dramatically, a truly massive archway carved by the sea, dwarfing the dive boats. We love diving it on the incoming tide, when the current really starts to pick up; that's when the drummer schools gather, moving like a silver river through the archway itself. You can duck into the calmer pockets, tucked close to the wall, and just watch them flow past. We usually start deep, around 20 metres, where the light takes on that beautiful blue filter. The walls are encrusted with these incredible grey massive sponges and all sorts of colourful invertebrates. Keep your eyes peeled for the smaller stuff too; we've found Spitlure Frogfish hiding amongst the growth and countless nudibranchs. The highlight, for us, is definitely drifting through the arch itself, feeling the push of the water, surrounded by schools of bluefish and parrotfish. It’s a exhilarating experience for competent divers who appreciate a bit of a ride.

    Today05:4518:3212h 47m daylightGolden hour 17:58

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    Conditions

    Ocean conditions, forecast and tides for Southern Arch

    Southern Arch Ocean Conditions

    Monthly averages for Southern Arch, 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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