DivePlnr
    Harrison Reef dive site
    reef
    Alaska, United States

    Harrison 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 - Harrison 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
    StandoutRich in charismatic marine life

    Harrison Reef in Alaska offers a glimpse into a very different kind of cold-water diving. While we don't have hard data on depth or difficulty, our team found the conditions here to be typical of Alaskan shore dives – expect chilly water and prepare for a bit of a current. The real draw is the unique collection of North Pacific life; we’ve spotted Calico and Coho salmon, and the kelp forests often hold Red Rock and Dungeness crabs. Keep an eye out for the Common Loon or Marbled Murrelet diving from above. It’s a great spot for divers keen on temperate marine biology and a quiet, uncrowded experience.

    Safety Notes

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

    Today06:0817:0610h 58m daylightGolden hour 16:18

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    Conditions

    Ocean conditions, forecast and tides for Harrison Reef

    Harrison Reef Ocean Conditions

    Monthly averages for Harrison 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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