Île de Groix offers a compact but varied underwater scene: shallow wrecks, reef walls and open ground ranging from beginner-friendly shallows to deep advanced dives. The Gray Seal is frequently encountered, and the European Common Cuttlefish is a near-constant presence. Summer brings the warmest water and the highest diver activity, while exposed western sites such as Pointe de Pen Men reward those who time conditions well.
Monthly water temperature across Île de Groix's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water is coolest in late winter and climbs gradually through spring into a warm summer peak in August and September, when most divers visit. Spring from May onward marks the start of favourable conditions, with visibility improving as the season builds. Autumn extends the usable window, though exposed sites can carry stronger surge as weather patterns shift.
3 operators
Groix, France
26 more sites to explore
Water temperature around Île de Groix ranges from about 10°C in February to 18°C in August, based on satellite sea-temperature data for its dive sites.
In the warm season (about 18°C) a 5mm suit is comfortable in Île de Groix; in the coldest months (about 10°C) step up to a drysuit.
Fin maps 30 sites in Île de Groix (21 scuba diving sites and 10 snorkelling spots, with some suited to both).
Across Île de Groix's dive sites, June, July and August are most often reported as the best months to visit.
The Gray Seal and European Common Cuttlefish are both very commonly observed across the sites. Ballan Wrasse, Hooded Shrimp, Anemone Spider Crab and Worm Pipefish appear frequently, while the Common Octopus and the nudibranch Warty Dorid are among the signature species. The Marbled Electric Ray is also listed as a signature encounter, making Île de Groix particularly interesting for invertebrate enthusiasts.
Yes, several sites are rated for beginners. The Thuringen wreck is shallow and accessible, and Pointe de Pen Men offers a reef and wall experience within a manageable depth range. More advanced divers can push deeper on sites such as the U 171 wreck. The mix of skill levels means groups with different experience can usually find appropriate dives on the same trip.
Most sites require a boat, and there are several local operators including Moi, je plonge à l'ouest, Club de plongée Subagrec, Patrice and Centre de plongée de Kerguelen Sports Océan. The Thuringen wreck supports both shore and boat entry, giving independent divers a shore option. Boat access is the norm for the deeper and more exposed sites around the island.
The site mix includes wrecks and reef walls, covering a broad range of depths. The Thuringen and Sperrbrecher 134 are wreck dives at contrasting depths, while Pointe de Pen Men combines a reef with a wall dropping to moderate depth. This variety means repeat visitors can alternate between wreck exploration and reef diving without the experience becoming repetitive.
