Selwyn Rocks
Why dive here
With 58+ marine species recorded in the area - including blue sharks, blue whales, humpback whales, orcas and seals & sea lions - Selwyn Rocks offers some of Alaska's richest diving. Water ranges 5-15°C, warmest July, August, September.
Diving Selwyn Rocks feels like exploring a cold-water fortress. The rocky landscape here is rugged, a maze of boulders and cracks where you’ll find plenty to investigate. Keep an eye out for Red Rock Crabs scuttling across the seabed and the occasional Big Skate gliding past. We’ve also spotted Spiny Dogfish hanging out in the deeper sections. This site is best for divers comfortable with cooler temperatures and who appreciate the unique, hardy marine life of the Pacific Northwest. If you’re into spotting species you won’t find in the tropics, Selwyn Rocks delivers.
Safety Notes
Cold water this month (avg 11°C). Drysuit or thick wetsuit (7mm+) recommended.
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Conditions
Ocean conditions, forecast and tides for Selwyn Rocks
Selwyn Rocks Ocean Conditions
Monthly averages for Selwyn Rocks, 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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