The Glenelg Dredge is a wreck and artificial reef sitting offshore from Adelaide, accessible by boat and rated suitable for beginners. The structure attracts a remarkably diverse mix of southern Australian species: Fiddler Ray and Port Jackson Shark are regularly encountered, alongside Weedy Seadragon, Blue Devilfish, and European Common Cuttlefish. Leatherjackets, flatheads, and cowfish are present in abundance. Water temperatures swing from cold winter lows to warm summer peaks, shaping how divers kit up through the year.
Monthly water temperature across Glenelg Dredge's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures peak through summer and ease off through autumn, dropping to their coldest in mid-winter before climbing again in spring. Summer months draw the highest diver activity, though the site attracts visits year-round. Cooler months reward those willing to layer up, with the structure continuing to hold species like Port Jackson Shark and Blue Devilfish regardless of season.
2 operators
Water temperature around Glenelg Dredge ranges from about 13°C in July to 22°C in January, based on satellite sea-temperature data for its dive sites.
9 more sites to explore
In the warm season (about 22°C) a 3mm full suit is comfortable in Glenelg Dredge; in the coldest months (about 13°C) step up to a 7mm or semi-dry suit.
Fin maps 10 sites in Glenelg Dredge (8 scuba diving sites and 3 snorkelling spots, with some suited to both).
The site has a well-documented list of species encountered regularly. Fiddler Ray and Port Jackson Shark are very commonly seen, along with Weedy Seadragon, European Common Cuttlefish, and Blue Devilfish. Fish life includes Dusky Morwong, Longsnout Boarfish, Shaw's Cowfish, Slender-spined Porcupine Fish, and several leatherjacket species.
Yes, the site is rated as suitable for beginners. The wreck sits at moderate depth, making it accessible without advanced certification. Boat access is required, so divers should be comfortable entering from a vessel and managing open-water conditions.
The site is reached by boat only. Adelaide Scuba is among the local operators running trips to the dredge. There is no shore entry option, so divers and snorkellers need to book with a boat operator to reach the site.
Water temperatures are at their warmest from late spring through summer and at their coldest in winter. Summer draws the most activity and tends to offer the most comfortable conditions. Winter diving is still possible and can produce interesting encounters, but cooler water means more exposure protection is needed.
