15-30m
    Poor Knights Islands, New Zealand
    Poor Knights Islands

    Poor Knights Islands - Northern 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 - Poor Knights Islands - Northern Arch offers some of Poor Knights Islands's richest cave 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
    CharacterCave dive · max 15-30m
    StandoutRich in charismatic marine life

    Northern Arch is Poor Knights at its absolute best. You drop in, and it's just this colossal, silent space carved right through the rock. We love drifting through the arch itself, watching the schools of demoiselles pulse and shift like one giant organism. Look up, and the light refracts through the surface, painting stripes on the rock walls, while down below, you’ll spot kina tucked into crevices and big long-nosed butterflyfish picking around the edges. Our favourite time to dive here is mid-morning, when the sun angle really sets the arch aglow. The currents can get a little pushy outside the arch, but inside, it’s usually calm enough for most divers to just hang and soak it all in. If you’re lucky, a mako might cruise by in the blue, though we’ve only seen that a couple of times. It’s an easy dive that feels epic, perfect for anyone who appreciates dramatic underwater architecture and vibrant fish life.

    Typical Poor Knights Islands - Northern Arch 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

    Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.

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

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

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    Conditions

    Ocean conditions, forecast and tides for Poor Knights Islands - Northern Arch

    Poor Knights Islands - Northern Arch Ocean Conditions

    Monthly averages for Poor Knights Islands - Northern 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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