Goat Island & Hauraki Gulf, New Zealand

    Lake Rotoma

    Best months: Jan–Apr

    Why dive here

    With 72+ marine species recorded in the area - including blue sharks, dolphins, hammerhead sharks, humpback whales and seahorses - Lake Rotoma offers some of Goat Island & Hauraki Gulf's richest cave diving. Water ranges 15-21°C, warmest January, February, March.

    Best timeJan–Apr
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Dolphins, Hammerhead Sharks, Humpback Whales and Seahorses · 72+ species recorded
    Water15-21°C · warmest January, February, March
    CharacterCave dive
    StandoutRich in charismatic marine life

    Okay, Lake Rotoma. Forget the ocean for a bit and reset your expectations for something completely different. We love this spot for its sheer calm and the unusual thrill of diving a freshwater lake. Your objective here is the sunken dinghy, resting at a comfortable 11 metres. It’s not some grand old freighter, just a small, humble boat, but it's genuinely charming, cloaked in a fine silt that shimmers in your torch beam. We’d suggest going early, before any surface activity stirs the already delicate visibility; six metres is average, sometimes better, sometimes worse, but always a gentle kind of murky. Keep your eyes peeled for the resident koura, New Zealand’s freshwater crayfish. They grow surprisingly large here, bigger than we’ve seen anywhere else, and they're often found scuttling around the dinghy or tucked into crevices. You'll also likely encounter brown and rainbow trout, sleek and fast, darting through the water. It’s a wonderfully quiet dive, a chance to really slow down and appreciate a unique piece of New Zealand’s geology and its submerged life.

    Safety Notes

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

    Today05:3618:2712h 51m daylightGolden hour 17:52

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    Conditions

    Ocean conditions, forecast and tides for Lake Rotoma

    Lake Rotoma Ocean Conditions

    Monthly averages for Lake Rotoma, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (-36.93, 175.86) (22km away)

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    October Averages

    Sea Temperature

    16°C

    60°F · Range: 14.5–16.9°C

    Current Speed

    1.41 cm/s

    Direction: SE (135°)

    Chlorophyll-a

    0.497 mg/m³

    Moderate productivity

    Salinity

    34.91 PSU

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

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