John Rock
Why dive here
With 58+ marine species recorded in the area - including blue sharks, blue whales, humpback whales, orcas and seals & sea lions - John Rock offers some of Alaska's richest diving. Water ranges 5-15°C, warmest July, August, September.
John Rock in Alaska is a solid, no-frills dive, especially if you’re into the colder water critters. You’re dropping onto a rocky reef, which we found loaded with sunflower stars, their arms slowly reaching. Keep an eye out for horned shrimp tucked into crevices and, if you’re lucky, a giant octopus. It's a great spot for those who appreciate the smaller, more unique finds rather than big pelagics.
Safety Notes
Cold water this month (avg 11°C). Drysuit or thick wetsuit (7mm+) recommended.
Reviews for John Rock
Conditions
Ocean conditions, forecast and tides for John Rock
John Rock Ocean Conditions
Monthly averages for John Rock, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (57, -135.4) (0km away)
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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