Thorn Rock
Why dive here
With 58+ marine species recorded in the area - including blue sharks, blue whales, humpback whales, orcas and seals & sea lions - Thorn Rock offers some of Alaska's richest diving. Water ranges 5-15°C, warmest July, August, September.
Thorn Rock can be a surprisingly vibrant dive if you catch it right, though you’ll need to manage Alaska’s notoriously brisk temperatures. The rock walls here are home to some impressive sunflower stars, their multiple arms spreading wide across the substrate. We've seen good numbers of Dungeness and Red Rock crabs scuttling about, and the occasional Big Skate cruises by, a real treat to spot. It’s a site that rewards a patient, keen eye, rather than promising big pelagics. Definitely one for the drysuit crowd who appreciate the subtler beauty of a colder temperate reef.
Safety Notes
Cold water this month (avg 11°C). Drysuit or thick wetsuit (7mm+) recommended.
Reviews for Thorn Rock
Conditions
Ocean conditions, forecast and tides for Thorn Rock
Thorn Rock Ocean Conditions
Monthly averages for Thorn 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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