Pacific Northwest, United States

    Mystery Reef

    Best months: Sep–Jan

    Why dive here

    With 35+ marine species recorded in the area - including humpback whales, orcas and seals & sea lions - Mystery Reef offers some of Pacific Northwest's richest reef diving. Water ranges 7-17°C, warmest July, August, September.

    Best timeSep–Jan
    WetsuitA drysuit
    Marine lifeHumpback Whales, Orcas and Seals & Sea Lions · 35+ species recorded
    Water7-17°C · warmest July, August, September
    CharacterReef dive

    Mystery Reef, despite its name, isn't much of a mystery once you’re down there. It’s a classic Pacific Northwest dive – think emerald green water and a surprising amount of invertebrate action. We love the sheer density of life clinging to every surface. You'll find walls carpeted in colorful anemones and nudibranchs, with huge lingcod peeking out from rocky crevices. Our favorite finds here are the smaller critters. Keep an eye out for the Four-Spined Squat Lobsters tucked into cracks and the delicate Pacific Glass Shrimp hovering near the sponges. We've even spotted curious Blackbelly Eelpouts slinking through the rocky rubble. The currents can pick up, so it's best for divers comfortable with a bit of a drift, but the payoff is worth it. It’s a site that really rewards a slow, deliberate dive, letting your eyes adjust to the subtle movements in the kelp and the vibrant hues of the invertebrates.

    Safety Notes

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

    Today06:3317:4011h 6m daylightGolden hour 16:56

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    Conditions

    Ocean conditions, forecast and tides for Mystery Reef

    Mystery Reef Ocean Conditions

    Monthly averages for Mystery Reef, sourced from NOAA NDBC + Copernicus Marine (EU) - nearest station: 9449880 - Friday Harbor, WA (27km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    11°C

    53°F · Range: 9.6–11.4°C

    Air Temperature

    11°C

    51°F

    Current Speed

    3.16 cm/s

    Direction: E (108.4°)

    Salinity

    23.61 PSU

    Wind Speed

    1.8 m/s

    3.5 knots

    Atmospheric Pressure

    1018.3 hPa

    Based on 5 years of monitoring data · Data sources: NOAA NDBC + Copernicus Marine (EU)

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