Florida Winter Diving: Wetsuit, Drysuit, or Tough It Out

People who have never dived South Florida in December assume it's all bathwater and board shorts year round. It isn't. From roughly December through March the water cools off, the air gets cool and breezy, and the diver who showed up in a 3mm shorty thinking "it's Florida" spends the whole boat ride home shivering and quietly miserable. The good news is that this is also some of the best diving of the year, and a little planning on the exposure side makes all the difference.

Winter is the good season

Let me get this out of the way first, because I don't want anyone reading "cooler water" and deciding to sit the season out. Winter off Palm Beach and Jupiter is genuinely excellent. The summer rains ease off, the runoff settles, and the water cleans up. You get those days where you drop in and can see the whole reef laid out below you before you even finish your descent. The boats are less crowded. The animals are still here — turtles, goliath grouper hanging around the wrecks, the occasional shark cruising the ledge on a drift.

So the question is never "should I dive in winter." It's "how do I stay warm enough to actually enjoy three drifts in a row." That's a gear problem, and gear problems have answers.

How cold it actually gets

Numbers vary year to year and with depth, but as a working picture: surface water that sat in the low-to-mid 80s in summer drops into the mid-70s by late fall, and through the heart of winter you'll commonly see the upper 60s to low 70s. Down on the deeper wrecks and ledges it can run a few degrees colder than the surface reading, and a cold upwelling can surprise you on any given day.

That doesn't sound dramatic on paper. Upper 60s isn't ice diving. But it's a long way from the bathwater people expect, and the air makes it worse. A breezy winter morning with the boat throwing spray means you're cool before you ever get wet, and you're cool again the moment you surface. Check the forecast for water and wind together — our conditions pages and seasonal site notes are worth a glance before you load the truck, because the day's wind has as much say in how cold you'll be as the water temp does.

The cold adds up over a boat day

Here's the part new winter divers miss. A single dive in 71-degree water in a 5mm feels totally fine. You're warm-blooded, you're moving, you're distracted by the reef. You climb back on the boat thinking you over-thought the whole thing.

Then you sit on a windy deck for an hour-long surface interval in a damp suit. Dive two starts a notch colder. By the time you're hanging on your safety stop — barely finning, just floating at fifteen feet for three to five minutes — the cold really sets in, because that's exactly when you're least active and most exposed. Dive three, you're cold from the giant stride. The chill is cumulative. It doesn't reset between dives the way it does between separate days. Anyone planning real decompression or staged hangs feels this even harder, because those long, motionless minutes at depth and on the way up are where heat just pours out of you.

So when you pick exposure protection for winter, don't gear for dive one. Gear for dive three, on the safety stop, in the wind.

5mm to drysuit, laddered

There's no single right answer — it depends on your own thermostat, how many dives you're doing, and how long you're staying down. Here's how I think about the ladder, honestly:

• A good 5mm. Workable if you run warm and you're doing one or two shorter dives. Add a hood and it stretches further. But for a full repetitive boat day in the coldest weeks, most people find a 5mm alone leaves them shivering by the end.
• 7mm with hood and gloves. This is the honest center of the bell curve. For the large majority of recreational divers down here, a quality 7mm — ideally with a hooded vest layered underneath — is the winter answer. It's warm enough for repetitive dives, it's simple, and it dries out by next weekend. If you buy one thing for Florida winter, buy this.
• Semidry. A step up in warmth for people who feel the cold more than average or want longer, more comfortable hangs without committing to a drysuit. It seals better at the wrists, neck, and ankles, so the trickle of cold water that flushes a normal wetsuit is reduced.
• Drysuit. The real move for technical and decompression divers, for anyone genuinely cold-sensitive, and for people doing long hangs across many repetitive winter days. You stay dry, you control your insulation with the undergarment, and dive three feels like dive one. The cost is money, training, more weight, and the buoyancy management that comes with it.

To be clear about where the crowd actually sits: most local rec divers run a 7mm with a hood and are perfectly happy all winter. The folks who go dry are usually the cold-averse and the tech crowd doing deco. Both are right — they're just solving different problems.

Hoods and gloves matter more than thickness

If you remember one practical thing from this, make it this: you lose a serious amount of heat through your head. A bare-headed diver in a thick suit will often be colder than a hooded diver in a thinner one. A hood — or better, a hooded vest that adds a second core layer at the same time — is the single highest-return piece of winter gear you can add. It's cheap relative to a whole suit and it transforms a borderline-cold day into a comfortable one.

Gloves matter too, and not only for warmth. Cold hands get clumsy. Fumbling with a clip, a light, or a deploying SMB because your fingers have gone numb is a real, if small, safety issue. A 3mm to 5mm glove for winter is cheap insurance for both comfort and dexterity.

The lesson is that warmth isn't only about the millimeters on your torso. Plug the leaks at your head and hands first, and a lot of "I need a thicker suit" problems quietly disappear.

The buoyancy and weighting tradeoff

More neoprene means more buoyancy, which means more lead on your belt, which means more weight to manage and more to think about underwater. A drysuit adds the air space in the suit itself as another buoyancy variable on top of your BC. None of this is a reason to under-dress and freeze — but it is a reason to re-check your weighting whenever you change suits for the season.

Throwing on a 7mm and a hooded vest after a summer in a 3mm can easily mean several extra pounds of lead, and guessing wrong makes you task-loaded and uncomfortable right when the water's cold. Do a proper weight check at the start of the season instead of carrying over your summer numbers. If you want a starting estimate to test against in the water, the weight calculator on the site will get you in the ballpark for a given suit — just remember it's a starting point you confirm with an actual check, not a final answer.

Warmth is a safety issue

I want to push back on the idea that staying warm is about being soft. Being cold isn't just uncomfortable — it degrades you. A chilled diver thinks slower and makes worse decisions. You breathe down your tank faster when you're cold, so your gas planning quietly goes sideways. And there's reasonable concern that being cold, especially during the ascent and safety stop, isn't kind to your decompression either — the body doesn't off-gas the same when it's working to stay warm and shunting blood away from the extremities.

Put that together and "tough it out" stops looking brave and starts looking like a stack of small, avoidable risks. The right amount of exposure protection isn't about comfort for its own sake. It keeps your head clear, your air consumption predictable, and your ascent profile honest. That's safety, not luxury.

What I'd pick

For the typical recreational diver doing a two- or three-tank winter boat trip off Palm Beach or Jupiter: a quality 7mm, a hooded vest under it, and proper gloves. That setup handles our coldest weeks for the vast majority of people, and it's the kit I steer most divers toward without hesitation.

If you run cold, hate being chilly, or you're routinely doing long, deco-laden, multi-dive days through the winter, the drysuit is worth the money and the training — and you'll dive more, and more comfortably, because of it. And if you're a hardy soul doing a single short dive on a calm, milder day, a good 5mm with a hood will see you through fine.

Whatever you choose, gear for the cold you'll feel on dive three at the safety stop, not the warmth you feel stepping off the boat. Do that, and winter turns into exactly what it should be down here — clear water, easy boats, and some of the best diving on the calendar.