DivePlnr
    Rennell Reef dive site
    reef
    5-20m
    Alaska, United States

    Rennell Reef

    Good diving all year

    Why dive here

    With 58+ marine species recorded in the area - including blue sharks, blue whales, humpback whales, orcas and seals & sea lions - Rennell Reef offers some of Alaska's richest reef diving. Water ranges 5-15°C, warmest July, August, September.

    Best timeYear-round
    WetsuitA drysuit
    Marine lifeBlue Sharks, Blue Whales, Humpback Whales, Orcas and Seals & Sea Lions · 58+ species recorded
    Water5-15°C · warmest July, August, September
    CharacterReef dive · max 5-20m
    StandoutRich in charismatic marine life

    Rennell Reef, off the coast of Alaska, offers a surprising glimpse into cold-water corals. While not the vibrant tropical reefs many imagine, this site is a stark, beautiful ecosystem of deep-sea corals and the unique creatures that call them home. Visibility can vary greatly, but divers prepared for chillier conditions will find it a fascinating, if challenging, experience. It’s definitely one for those interested in the less-explored corners of the diving world.

    Typical Rennell Reef 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.

    Safety Notes

    Cold water this month (avg 11°C). Drysuit or thick wetsuit (7mm+) recommended.

    Today06:0917:0810h 58m daylightGolden hour 16:20

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    Conditions

    Ocean conditions, forecast and tides for Rennell Reef

    Rennell Reef Ocean Conditions

    Monthly averages for Rennell Reef, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (57, -135.4) (0km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    11°C

    51°F · Range: 8.5–12.8°C

    Air Temperature

    8°C

    47°F

    Wind Speed

    6.44 m/s

    12.5 knots

    Atmospheric Pressure

    1007.9 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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