The Neptune Islands lie off the Eyre Peninsula in South Australia, accessible only by boat from Port Lincoln. Diving here centres almost entirely on Great White Shark cage diving: the site descriptions confirm dives are conducted within protective cages due to the presence of great white, bronze whaler, and mako sharks. Beyond the sharks, New Zealand fur seals and Australian sea lions are also encountered. The wider site cluster includes reef, seagrass, and drop-off topography reaching thirty metres. Water is cold year-round by Australian standards, with temperatures ranging from the mid-teens in winter to around twenty degrees in the warmest months.
Monthly water temperature across Neptune Islands's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures are coldest in late winter and warmest in late summer, though the range stays cool relative to most Australian dive destinations, so a drysuit or thick wetsuit is advisable. Currents can be moderate and shifting, and Main Bay carries additional hazards from boat traffic and marine life interactions that divers should factor into their planning.
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Water temperature around Neptune Islands ranges from about 15°C in August to 19°C in January, based on satellite sea-temperature data for its dive sites.
In the warm season (about 19°C) a 5mm suit is comfortable in Neptune Islands; in the coldest months (about 15°C) step up to a 7mm or semi-dry suit.
Fin maps 3 sites in Neptune Islands (2 scuba diving sites and 1 snorkelling spots).
Across Neptune Islands's dive sites, May, June, July, August, September and October are most often reported as the best months to visit.
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