Arcachon Bay divides naturally between the Arcachon sub-area and Cap Ferret, together offering wrecks, artificial reefs, seagrass beds and deeper natural reefs. The Common Octopus, European Common Cuttlefish and Tompot Blenny are consistently encountered across sites, while the Gray Seal is a notable observation-backed highlight. Conditions suit all levels: shallow, sheltered entries sit alongside deep intermediate dives off Cap Ferret. Warmer water through summer and early autumn marks the most popular window.
Monthly water temperature across Arcachon Bay's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures rise through summer, peaking in August and September, which is when diver activity is highest. Cooler months from winter into spring suit those comfortable in thicker suits, with conditions remaining diveable year-round. Currents and exposure vary between the sheltered Arcachon sites and the more open Cap Ferret locations.
31 operators
32 more sites to explore
2 areas
Water temperature around Arcachon Bay ranges from about 12°C in February to 20°C in August, based on satellite sea-temperature data for its dive sites.
In the warm season (about 20°C) a 5mm suit is comfortable in Arcachon Bay; in the coldest months (about 12°C) step up to a 7mm or semi-dry suit.
Fin maps 41 sites in Arcachon Bay (31 scuba diving sites and 14 snorkelling spots, with some suited to both), organised into 2 areas.
Across Arcachon Bay's dive sites, June, July, August and September are most often reported as the best months to visit.
The Common Octopus and European Common Cuttlefish are very frequently encountered across the bay's sites. Conger Eel, Scorpionfish, Tompot Blenny and Brittle Star are also very common sightings. The Gray Seal is an observation-backed highlight, and the Marbled Electric Ray is occasionally seen for those who look carefully.
Yes, several sites are explicitly rated for beginners, including Fosse la Teste, La Vigne, L Herbe and Chez Hortense. These offer shallow depths and, in some cases, shore entry. More experienced divers can progress to deeper intermediate sites such as Le Chariot and Le Frigolin off Cap Ferret.
Arcachon offers a larger number of sites, including shallow beginner dives and seagrass beds with easy access. Cap Ferret sites tend to run deeper and are better suited to intermediate divers, with boat-only entries and more demanding conditions. Both sub-areas feature wrecks and artificial reefs.
Some sites, including Fosse la Teste, offer shore entry, making them accessible without a boat. However, the majority of dive sites in Arcachon Bay require boat access, and a number of operators based in the area run guided boat dives across both sub-areas.
