Seven Stones Reef
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.
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.
Reviews for Seven Stones Reef
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)
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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