5-18m
    Poor Knights Islands, New Zealand
    Poor Knights Islands

    Middle 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 - Middle 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 · max 5-18m
    StandoutRich in charismatic marine life

    Middle Arch is a site we always make time for at the Poor Knights, and it’s a good one to hit early in the day before other boats crowd the space. Drop in at the northern side, and you’re instantly in the twilight, the arch opening up below you. We love the feeling of being funnelled through, the rock walls rising on either side, often draped with orange jewel anemones. Look up sometimes, and you’ll see the sunlight filtering through the kelp at the shallower parts. You’ll usually find big schools of snapper and kingfish hanging in the current, and we’ve often seen short-tail stingrays cruising the sandy bottom at about 18 meters. The really cool part is the small cave near the southwestern exit. It’s a tight squeeze in, but once you’re inside, there’s an air pocket, and you can surface and hear the shearwaters calling from outside. It’s an ethereal, almost ancient sound, really making you feel connected to this wild place. This site suits divers who appreciate a bit of overhead environment, comfortable navigating through a well-lit arch. Expect to be surrounded by schools of fish, and keep an eye out for those impressive stingrays.

    Typical Middle Arch 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.

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

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    Conditions

    Ocean conditions, forecast and tides for Middle Arch

    Middle Arch Ocean Conditions

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

    ExcellentGreatGoodFairPoor★Best monthsThis month

    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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