Winter diving: where and how to dive year-round

When autumn arrives and temperatures drop, many divers pack away their gear and wait for summer. That is a mistake. Winter is arguably the best time to dive in certain destinations, and even in cold-water countries like Belgium, diving year-round is not only possible but genuinely rewarding. This guide covers your two main winter diving options: escaping to warm water (with Tenerife as the standout choice) and embracing cold-water diving in a dry suit closer to home.

Why is Tenerife the best winter diving destination in Europe?

While the Mediterranean shuts down from November to April (water temperatures plunge to 13-16 degrees, many dive centres close, and conditions deteriorate), Tenerife keeps going. The Canary Islands sit at the latitude of the Sahara, bathed by the warm Canary Current, and enjoy the most stable year-round diving conditions in Europe.

In winter (December to March), Tenerife's water temperature ranges from 18 to 19 degrees Celsius. That is cool enough for a 5 mm or 7 mm wetsuit but perfectly comfortable for diving. Visibility actually improves in winter, often reaching 25 to 30 metres, because the summer plankton blooms have subsided. Tourist numbers are lower, meaning dive sites are less crowded and prices for flights and accommodation are at their lowest.

But the biggest reason to dive Tenerife in winter has a name: the angel shark (Squatina squatina). This critically endangered species, classified as one of the most threatened sharks in the world by the IUCN, finds its last major refuge in the Canary Islands. Angel sharks are flat, ray-like bottom dwellers that camouflage themselves in the sand at depths of 5 to 25 metres. They are most active and most frequently encountered during the cooler months, from November to March. Tenerife is one of the very few places on Earth where you have a realistic chance of seeing them.

For a complete overview of Tenerife's dive sites, conditions and marine life, see our comprehensive Tenerife diving guide.

What about winter diving in Belgium?

Belgium might not be the first country that comes to mind when you think of diving, but its quarries and lakes are diveable year-round if you have the right equipment. Winter in Belgian quarries brings some genuine advantages: visibility improves dramatically as the algae die off and suspended particles settle. From October to March, visibility in quarries like Vodelee and La Gombe can reach 8 to 15 metres, compared to 3 to 5 metres in summer.

Water temperatures in Belgian quarries in winter range from 4 to 8 degrees Celsius. A dry suit is not optional; it is essential. Dry suit diving is a skill in itself, and if you have never used one, you should take the PADI Dry Suit Diver specialty before your first cold-water dive. The course covers suit inflation and deflation, buoyancy management (which works differently from a wetsuit), emergency procedures, and the all-important neck and wrist seal care.

For the full guide to Belgian dive sites, conditions and what to expect, see our diving in Belgium article.

What equipment do you need for winter diving?

The equipment requirements for winter diving depend entirely on where you are diving. Here is a breakdown for both scenarios:

Warm-water winter diving (Tenerife, 18-19 degrees)

• Wetsuit: a 5 mm full suit is the minimum. Many divers prefer a 7 mm or a 5 mm with a hooded vest underneath. Check our wetsuit guide for sizing and material advice.
• Hood: highly recommended at 18-19 degrees if you get cold easily. A 3 mm neoprene hood makes a noticeable difference.
• Gloves: optional but appreciated. 2-3 mm neoprene gloves keep your hands functional throughout the dive.
• Everything else: standard tropical or temperate equipment. Nothing special required.

Cold-water winter diving (Belgium, 4-8 degrees)

• Dry suit: a trilam or neoprene dry suit is essential. Under it, you wear thermal undergarments (not cotton; synthetic or merino wool base layers plus an insulating mid-layer). The suit keeps water out entirely; you stay dry inside and regulate warmth through inflation.
• Hood: a 5-7 mm thick hood is mandatory. Consider a bibbed hood that tucks inside your suit for better sealing.
• Gloves: 5 mm minimum, many divers prefer dry gloves with thermal liners for extended cold-water dives. Dexterity suffers but warmth is worth it.
• Regulators: cold-water rated regulators are essential. Standard regulators can free-flow (deliver air continuously) in water below 10 degrees because the rapid expansion of air chills the mechanism. Environmentally sealed regulators prevent this.
• Redundant air source: carrying a pony bottle (small independent air cylinder) is strongly recommended for cold-water diving, as regulator free-flow is the primary equipment risk.

How do you stay warm during winter dives?

Cold is the biggest challenge in winter diving, and managing it is a skill in itself. Here are practical tips that make a real difference:

• Eat and hydrate well before diving: your body burns more calories to maintain temperature in cold water. A warm meal an hour before diving and plenty of warm drinks between dives keep your core temperature up.
• Warm up before your dive: getting into cold water when you are already cold is miserable. Wear extra layers until the last moment, bring hand warmers, and have a hot drink ready for when you surface.
• Limit dive time: in 5-degree water, even with a dry suit, 30 to 40 minutes is a reasonable maximum for most recreational divers. Pushing beyond your thermal comfort is counterproductive because shivering impairs your cognitive function and increases your air consumption.
• Keep moving between dives: the surface interval is where most cold stress occurs. Change out of wet gear immediately, put on dry clothes and keep moving.
• Invest in quality undergarments: the insulation under your dry suit matters more than the suit itself. Thinsulate, Primaloft or similar synthetic insulation rated to the water temperature you are diving in makes the difference between a comfortable dive and a miserable one.

What marine life can you see during winter dives?

Winter diving offers marine life encounters that simply do not happen in summer. Here are the highlights:

In Tenerife: angel sharks (November to March), increased ray activity on sandy bottoms, larger pelagic visitors attracted by cooler nutrient-rich currents, and resident turtles that are present year-round. Winter is also an excellent time for nudibranchs, which tend to be more abundant and more varied. See our turtle diving guide for more on encounters.

In Belgium: winter quarry diving offers an eerie, atmospheric experience. Visibility is at its best, underwater structures (submerged platforms, training objects, even sunken boats) are more visible, and the cold water creates a unique stillness. Pike are more active in cooler months, and crayfish are often spotted along rocky bottoms.

Is winter a good time for PADI courses?

Absolutely. In Tenerife, winter is actually one of the best times for PADI courses. The water is slightly cooler but perfectly comfortable, the dive sites are less crowded, and there is more flexibility with scheduling. All courses from Discover Scuba Diving to Divemaster are available year-round.

In Belgium, winter is an excellent time for the Dry Suit Diver specialty, for obvious reasons. It is also a good period for continuing education courses (Advanced, Rescue) if you are comfortable in cold water.

At Dive With Lau, we run PADI courses throughout the winter in Tenerife. Conditions are reliable, the island is quieter, and the overall cost of a winter dive trip (flights, accommodation) is often 30 to 40 percent lower than peak summer prices.

The bottom line

Diving does not have a season. Whether you fly south to Tenerife for angel sharks in warm volcanic waters or pull on a dry suit and explore a Belgian quarry in crystal-clear winter visibility, the underwater world is open year-round. The only thing stopping you is the assumption that diving is a summer activity. It is not.

For more on choosing the right destination for your diving trip, see our best diving destinations from Brussels guide.

Want to plan a winter dive trip? Get in touch with Lau. Tenerife is available 365 days a year, and the angel sharks are waiting.