The Cobourg Peninsula sits where the Van Diemen Gulf meets the Arafura Sea, within Garig Gunak Barlu National Park, jointly managed by the Arrarrkbi people. Access is limited to the dry season, and the presence of saltwater crocodiles restricts swimming and diving in many areas. Sites such as Mardbalk Bay, Sandy Bay Reef, and Popham Creek span shallow reefs, seagrass beds, and mangrove-adjacent environments, reaching no deeper than fifteen metres. The species list covers tasselled wobbegongs, spotted eagle rays, green sea turtles, nurse sharks, painted frogfish, and seamoths. Conditions vary with tide and site, and local consultation before entering the water is essential.
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Monthly water temperature across Cobourg Peninsula's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures stay warm throughout the year, peaking around thirty-one degrees in November and December and dropping to the mid-twenties in July and August. The dry season brings calmer seas and is the only practical window for visiting, while wet-season conditions make access difficult and currents unpredictable.
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Water temperature around Cobourg Peninsula ranges from about 26°C in July to 31°C in December, based on satellite sea-temperature data for its dive sites.
In the warm season (about 31°C) a rash guard or 3mm shorty is comfortable in Cobourg Peninsula; in the coldest months (about 26°C) step up to a 3mm full suit.
Fin maps 8 sites in Cobourg Peninsula (8 scuba diving sites and 1 snorkelling spots, with some suited to both).
Across Cobourg Peninsula's dive sites, May, June, July, August, September and October are most often reported as the best months to visit.
8 more sites to explore
