Cornwall & Devon, United Kingdom
    Porth Seal (St. Martin's)

    Seven Stones Reef

    Best months: Jul–Sep

    Protected Area

    Porth Seal (St. Martin's)

    Why dive here

    With 176+ marine species recorded in the area - including blue sharks, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - Seven Stones Reef offers some of Cornwall & Devon's richest reef diving. Water ranges 10-18°C, warmest July, August, September.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Dolphins, Dwarf Minke Whales, Humpback Whales and Ocean Sunfish (Mola Mola) · 176+ species recorded
    Water10-18°C · warmest July, August, September
    CharacterReef dive
    StandoutExceptional marine biodiversity

    The Seven Stones Reef sits out there, a real wild card in Cornish diving. It’s not your usual accessible shore dive; this is one you plan for, often by boat from somewhere like Sennen Cove, weather permitting. The conditions can be… lively, so you’ll want some experience under your belt. What we love about the Seven Stones is that untamed feeling. Descending onto the rock formations, it’s a mosaic of colours from the jewel anemones and Devonshire cup corals that coat every surface. It’s a good spot to see larger pelagics too. We’ve had Short-beaked Common Dolphins zip past us here, and the gulls - Kittiwakes, Great Black-backed Gulls - are always wheeling overhead, a reminder of how remote you are. Keep an eye out for the Glycerine Worms; they’re surprisingly beautiful against the dark rock. Visibility can vary wildly with the tides and swell, but on a good day, it’s truly something. This site suits adventurous divers who appreciate raw, exposed reef diving.

    Today06:4017:4311h 3m daylightGolden hour 17:00

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    Conditions

    Ocean conditions, forecast and tides for Seven Stones Reef

    Seven Stones Reef Ocean Conditions

    Monthly averages for Seven Stones Reef, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (50.44, -2.73) (3km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    17°C

    62°F · Range: 15.1–17.5°C

    Air Temperature

    13°C

    56°F

    Wind Speed

    8.14 m/s

    15.8 knots

    Atmospheric Pressure

    1011 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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