Bouley Bay and St Catherines sit on the north and north-east coast of Jersey in the English Channel, offering a mix of reef, kelp forest, seagrass, and artificial reef across five sites. Water is cold by Channel standards in winter but warms noticeably through late summer. Depths across the area are shallow to moderate, making the sites accessible to beginners and intermediates via both shore and boat entry. Species recorded here include ballan wrasse, European conger, cat shark, nudibranchs, hermit crabs, snake pipefish, and lumpfish, with Bouley Bay serving as Jersey's principal shore-diving hub.
Monthly water temperature across Bouley Bay and St Catherines's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures sit at their coldest in late winter and climb to their warmest in late summer and early autumn, when conditions suit those who prefer thinner wetsuits. Shore entry is possible year-round at Bouley Bay, though visibility can vary widely depending on conditions.
Water temperature around Bouley Bay and St Catherines ranges from about 10°C in January to 18°C in September, based on satellite sea-temperature data for its dive sites.
In the warm season (about 18°C) a 5mm suit is comfortable in Bouley Bay and St Catherines; in the coldest months (about 10°C) step up to a drysuit.
Fin maps 5 sites in Bouley Bay and St Catherines (5 scuba diving sites and 1 snorkelling spots, with some suited to both).
2 more sites to explore
Across Bouley Bay and St Catherines's dive sites, June and September are most often reported as the best months to visit.
