Custom Drysuits in Australia: Cold Water Diving Down Under

Australia’s diving reputation is built on the Great Barrier Reef and the warm tropical waters of Queensland and Western Australia’s north. What gets less attention is the southern half of the country, where the water is cold, the marine life is extraordinary, and drysuits are not optional — they are standard equipment.

From Victoria’s shipwreck coast to Tasmania’s kelp forests and South Australia’s cage-less great white encounters, Australia’s temperate and cold-water diving is world-class. And it demands the right thermal protection.

Australia’s Cold Water Diving Regions

Victoria

Victoria’s coastline offers some of the most accessible cold-water diving in Australia. Port Phillip Bay, the Mornington Peninsula, and the western coast towards the Twelve Apostles all provide excellent diving with conditions that demand a drysuit for serious use.

Water temperatures: 10 to 14 degrees Celsius in winter (June to August), 16 to 20 degrees in summer (December to February). Below the thermocline, temperatures are consistently cooler.

Port Phillip Bay hosts an impressive network of artificial reefs, submarine canyons along the Heads, and diverse temperate marine life including weedy seadragons, giant cuttlefish, and a surprising density of nudibranchs. The Heads themselves — the narrow entrance to the bay — offer challenging drift dives in cold, current-rich water.

The shipwreck coast along Victoria’s southwest is home to over 200 documented wrecks, including the Loch Ard, which sank in 1878 near the Twelve Apostles. Conditions here are demanding: cold water, swell exposure, and limited access make these dives the domain of experienced, well-equipped divers.

Tasmania

Tasmania is Australia’s cold-water diving capital. The island sits in the path of the Roaring Forties, surrounded by some of the cleanest and coldest water in the Australian region.

Water temperatures: 10 to 13 degrees Celsius in winter, 14 to 18 degrees in summer. Southern and western exposures are colder. Below 20 metres, temperatures drop further and remain cold year-round.

The east coast — particularly the Tasman Peninsula — offers dramatic wall dives, cave systems, and kelp forests that rival anything in the temperate world. Waterfall Bay, the Cathedral, and the Hippolyte Rocks feature towering underwater cliffs covered in sponge gardens, sea whips, and basket stars.

Tasmania’s west coast is wilder and less dived, with strong Southern Ocean influences. The diving is spectacular but conditions are serious, with water temperatures in the low teens even in summer and significant swell.

For any sustained diving in Tasmania, a drysuit is the standard choice. Wetsuit diving is possible for short, shallow dives in summer, but a drysuit opens up the full range of what the island offers.

South Australia

South Australia has carved out a reputation for encounters with large marine life, and the water temperature is a big part of why.

Water temperatures: 12 to 16 degrees Celsius in winter, 17 to 22 degrees in summer, depending on location. The waters of the Great Australian Bight are colder, sitting between 10 and 16 degrees for much of the year.

Rapid Bay Jetty, on the Fleurieu Peninsula, is one of Australia’s most popular dive sites — famous for leafy seadragons and the unusual underwater structure of the old jetty pylons. The water here sits in the mid-teens for most of the year, cool enough that most regular divers prefer a drysuit.

The Neptune Islands, where cage diving with great white sharks is a major industry, involve cold, exposed waters. While most cage diving operations use wetsuits for their brief in-water periods, serious divers and underwater photographers working longer durations in these waters use drysuits.

Kangaroo Island’s coastline and the waters of the Great Australian Bight offer diving with Australian sea lions, dolphins, and pelagic species in water that rarely exceeds 16 degrees.

Western Australia’s South Coast

While Western Australia’s northern coast is tropical, the south coast from Albany to Esperance experiences southern ocean conditions. Water temperatures range from 14 to 20 degrees, and the diving includes granite reef systems, offshore islands, and historical wrecks from both World Wars.

This region is often overlooked, but divers who make the effort find cold, clear water and marine life adapted to temperate conditions — a different ecosystem from the tropical north.

Why Custom Fit Matters for Australian Divers

A drysuit that does not fit properly creates problems that compound over a dive. Excess material in the legs traps air and makes trim difficult. A suit that is too tight restricts breathing and movement. Poor fit around the torso makes buoyancy control harder than it needs to be.

These problems are amplified in the conditions Australian cold-water divers face: current, swell, limited visibility, and long surface swims. A suit that fights you in these conditions is worse than uncomfortable — it is a liability.

Off-the-rack drysuits are designed for average proportions. Australian divers, like divers everywhere, come in all shapes and sizes. A custom-measured suit eliminates the compromises of standard sizing. It fits your body, your proportions, and the way you actually move underwater.

Custom fit also affects undergarment layering. A suit built to your measurements allows you to wear the insulation you need without the suit becoming too tight in some areas and too loose in others. This is particularly relevant in Australia’s variable conditions, where you might wear a thin base layer for a summer dive in Port Phillip Bay and a heavy thermal undersuit for a winter dive in Tasmania.

Getting an Ugly Fish Drysuit in Australia

Sealachi distributes Ugly Fish drysuits to Australia. Each suit is handmade in Italy from the diver’s individual measurements, with full customisation of materials, colours, and features.

The process works remotely. Sealachi provides detailed measurement guidance, and once the measurements and specifications are confirmed, the suit is built and shipped directly. Australian divers can choose from the full Ugly Fish range — from the Hydroman’s proven all-round capability to the Ninja’s reinforced protection for wreck and overhead environments.

For Australian divers who have struggled with off-the-rack fit, or who have specific requirements that standard sizes cannot accommodate, a custom Ugly Fish suit is built to solve exactly that problem.

Caring for Your Drysuit in Australian Conditions

Australia’s UV levels are among the highest in the world, and this affects drysuit care. Latex seals in particular degrade faster with UV exposure. After every dive, rinse the suit thoroughly with fresh water. Store it out of direct sunlight — a dedicated suit bag or a shaded, ventilated area is ideal.

Zipper care is straightforward but essential. Lubricate the waterproof zipper with the manufacturer’s recommended wax after every few dives, and always store the suit with the zipper open or at most loosely closed to avoid stressing the seal.

If you dive in salt water — and most Australian diving is salt water — a thorough freshwater soak of the suit, valves, and zipper after each session prevents salt crystallisation and extends the life of every component.

Frequently Asked Questions

Is a drysuit necessary for diving in Victoria?

For year-round diving, yes. Summer temperatures in Port Phillip Bay allow wetsuit diving for short, shallow dives, but a drysuit makes any dive beyond a casual single tank more comfortable and safer. In winter, a drysuit is the clear choice.

What undergarments should I use for Australian conditions?

For summer diving in the warmer southern states (Victoria, South Australia), a mid-weight fleece undersuit works well. For winter, Tasmania, or any deeper diving, a heavier thermal undersuit is appropriate. The advantage of a trilaminate drysuit is that you adjust insulation by changing undergarments rather than changing suits.

Can I travel with a trilaminate drysuit?

Yes. Trilaminate suits are significantly lighter and more packable than neoprene drysuits. An Ugly Fish trilaminate folds down to a manageable size for checked luggage, making it practical for Australian divers who travel between states for diving or head to destinations like New Zealand, Papua New Guinea, or the Pacific Islands.

Which suit is best for Australian wreck diving?

Victoria’s shipwreck coast and other wreck sites around southern Australia involve contact with corroded metal, rocky substrates, and confined spaces. The Ninja offers the best combination of cut resistance, abrasion protection, and environmental durability for Australian conditions. The Hydroman is an excellent all-round choice for divers who primarily dive reefs and open water.

How long does it take to receive a custom suit in Australia?

Build times and shipping vary. Contact Sealachi directly for current lead times. The measurement and ordering process can be completed remotely, and the suit is shipped from Italy once complete.