Alaska, United States

    Alert Rock

    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 - Alert Rock offers some of Alaska's richest 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
    StandoutRich in charismatic marine life

    Alert Rock is where we send divers looking for something a bit different, a little wilder than your average temperate dive. Dropping down, you hit this massive underwater rock formation, jagged and craggy, just begging to be explored. We love watching the giant kelp sway in the surge here, feeling that cold water on your face, knowing you’re truly somewhere special. The real show, for us, is the macro stuff and the sheer abundance of critters that thrive in these rich Alaskan waters. Keep your eyes peeled for those horned shrimp tucked into crevices, and we’ve spotted more than a few spotted ratfish gliding along the rocky bottom. Our favourite is just how many different sea stars you’ll find, especially the sunflower stars, bright orange against the darker rock. This isn't a dive for coral fanatics, obviously, but if you appreciate the rugged beauty of a northern ecosystem and want to see some serious invertebrate action, Alert Rock delivers. We usually suggest bringing an extra layer of thermal protection, as the water can be brisk even in summer.

    Safety Notes

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

    Today06:1117:0810h 56m daylightGolden hour 16:19

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    Conditions

    Ocean conditions, forecast and tides for Alert Rock

    Alert Rock Ocean Conditions

    Monthly averages for Alert Rock, 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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