Cottesloe's diving ranges from shallow shore reefs a short wade from the beach to deep boat-access wrecks well offshore. Beginners have plenty to work with: sites like North Cottesloe Reef, Wannaroo Reef, and Bicton Baths sit in gentle, shallow water, while advanced divers can head out to North Lump and Gemini for wreck diving at depth. The signature draw is the marine life, particularly Weedy Seadragon, Star Octopus, Port Jackson Shark, and Ornate Wobbegong, alongside a strong nudibranch showing across the reefs.
Monthly water temperature across Cottesloe's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperature peaks through late summer and tapers to its coolest through late winter into early spring. The best-months data points strongly to autumn and late spring as the most popular periods, with a secondary surge in spring. Mid-winter sees the fewest divers, likely reflecting cooler water and reduced visibility rather than any absolute closure of the season.
14 operators
20 more sites to explore
Water temperature around Cottesloe ranges from about 19°C in August to 23°C in March, based on satellite sea-temperature data for its dive sites.
In the warm season (about 23°C) a 3mm full suit is comfortable in Cottesloe; in the coldest months (about 19°C) step up to a 5mm suit.
Fin maps 32 sites in Cottesloe (29 scuba diving sites and 5 snorkelling spots, with some suited to both).
Across Cottesloe's dive sites, March, April, May, September, October and November are most often reported as the best months to visit.
Cottesloe has a rich and distinctive cast of species. Weedy Seadragon and Pygmy Pipehorse are among the signature finds, alongside Star Octopus, Ornate Wobbegong, and Port Jackson Shark. Nudibranchs are well represented, with Chromodoris westraliensis and the Ornate Facelinid recorded commonly across the reefs. Weeping Toadfish turns up at a remarkable proportion of sites.
Yes, the majority of sites in Cottesloe are rated for beginners. Shore dives such as Rocky Bay, North Cottesloe Reef, Waterman Beach, and Hillarys North Wall offer easy entry and shallow reef exploration. Several boat-access sites like Honeycomb and Monkeys Cave are also beginner-friendly, though a handful of deeper wreck sites such as North Lump and Gemini are reserved for advanced divers.
A good number of sites are accessible directly from shore, including Rocky Bay, North Cottesloe Reef, Hillarys North Wall, Wannaroo Reef, Boyinaboat Reef, Waterman Beach, and Bicton Baths on the Swan River. These shore entries suit divers who prefer to dive independently or are just getting started. Deeper and more exposed sites such as North Lump, Gemini, and Bat Caves require boat access.
There are numerous operators serving the area. Among those listed are Scuba Obsession, Western Blue Dive and Charters, Perth Diving Academy, Image Dive and Charters, Perth Ocean Diving, and Diving WA, alongside several others including freediving specialists such as Rusty Freediving and Bubbles Freediving Academy. This breadth means options exist for guided boat charters, training courses, and equipment support.
