Wetsuit vs Drysuit for Liveaboards: Temperature Guide by Destination

Few things ruin a dive faster than being cold. Not "oh, it's a bit nippy" cold. The kind of cold where your hands stop working, your brain stops caring about the manta overhead, and the only thought in your head is when can I get out.

On a liveaboard, you're doing four or five dives a day. If your exposure protection is wrong, that's four or five rounds of misery. For a week. Let's make sure that doesn't happen to you.

The Basics: How Exposure Protection Works

Wetsuits trap a thin layer of water between the neoprene and your skin. Your body heats that water, and the neoprene insulates it. The thicker the neoprene, the warmer you stay — but also the more buoyancy you add (which means more weight on your belt).

Drysuits keep you completely dry using waterproof seals at the wrists, neck, and zipper. You wear insulating undergarments beneath. They're more complex to dive, but in cold water, they're a revelation.

Rashguards and skins offer minimal thermal protection but guard against sun and stings. Perfect for tropical surface intervals.

Water Temperature Guide by Destination

Here's what to expect and what to wear at the most popular liveaboard destinations:

Tropical and Warm (27-30°C / 80-86°F)

Maldives (27-30°C year-round)

3mm full suit or shortie
Some divers get by in a rashguard, but a thin wetsuit protects against hydroids and fire coral
A hooded vest if you run cold on dive four of the day

Red Sea, Egypt (22-28°C depending on season)

Summer: 3mm is plenty
Winter (November-March): 5mm strongly recommended, especially for deeper wrecks
The thermoclines in the Red Sea are sneaky — warm at 10m, surprisingly cool at 30m

Thailand / Andaman Sea (27-30°C)

3mm full suit, even if the water is bathwater-warm
Protection against jellyfish and plankton stings is the real reason

Moderate (22-27°C / 72-80°F)

Indonesia — Komodo (24-28°C, but variable)

5mm is the safe bet
Komodo has significant thermoclines; you can go from 28°C to 21°C in a single descent
Bring a hood for the colder pockets — your head loses heat fast

Indonesia — Raja Ampat (27-30°C)

3mm is usually fine
Warmer and more stable than Komodo
A lightweight full suit for abrasion protection on reef dives

Palau (27-30°C)

3mm full suit
Currents can make you feel colder than the thermometer suggests
A reef hook will keep you stationary, but you'll still feel the chill on long drifts

Cool (18-24°C / 64-75°F)

Galápagos (16-24°C, wildly variable)

7mm is the minimum. Seriously.
Many experienced Galápagos divers wear semi-dry or even drysuits
The Cromwell Current brings 16°C upwellings that hit without warning
Hooded vests, gloves, and boots are non-negotiable
This is the destination where people most often underestimate the cold

Truk Lagoon (27-30°C surface, but wrecks are deep)

3mm for most divers
The wrecks sit deep, and longer bottom times in the holds can feel cooler
A 5mm if you're planning serious wreck penetration

When to Consider a Drysuit

Drysuits on liveaboards are less common but absolutely valid for certain destinations. Consider one if:

Water temperature is below 20°C for most dives (Galápagos, winter Red Sea, Socorro)
You're doing 4+ dives daily and can't warm up between them
You run cold — and you know who you are
The trip is long — cold stress accumulates over days

Drysuit Practicalities on Liveaboards

Storage: Drysuits take up more space. Talk to the boat crew about hanging options
Drying: They need airflow to dry inside. The dive deck can work, but don't leave them in the sun
Weight: You'll need more lead to counteract the air in the suit
Training: If you haven't dived dry before, a liveaboard is NOT the place to learn. Get certified first
Undergarments: Bring multiple sets so you always have a dry one

Rental vs Your Own: The Real Talk

Own Your Wetsuit If...

You dive more than once or twice a year
You're between sizes (rental suits are M, L, XL — your body probably isn't)
You care about comfort (your own suit, broken in, is always better)
You have skin sensitivities or allergies to neoprene chemicals

Rent If...

You dive rarely and it's always tropical
You're still figuring out what thickness you prefer
Luggage restrictions make bringing a 7mm impractical
The liveaboard has a good reputation for quality rentals (ask us — we know which boats do)

The Hybrid Approach

Many experienced liveaboard divers own a 3mm and a 5mm and rent or borrow for extreme destinations. This covers about 90% of scenarios without filling your entire suitcase with neoprene.

Pro Tips for Staying Warm

Even with the right suit, these habits make a difference:

Stay hydrated: Dehydration makes you feel colder (and increases DCS risk)
Eat between dives: Your body burns calories to stay warm
Wear a hood: 40% of heat loss is through your head. Even a thin neoprene beanie helps
Hot drinks: Most liveaboards have tea, coffee, and hot chocolate between dives. Use them
Windbreaker on deck: Wind chill between dives is a silent thief. A dry layer topside is worth its weight in gold
Don't be a hero: If you're cold, surface early. One cut-short dive beats hypothermia

The Bottom Line

There's no universal answer to "what should I wear?" It depends on where you're going, when you're going, how your body handles cold, and how many dives per day you're planning.

The worst-case scenario is packing too thin. Cold divers don't enjoy themselves, burn air faster, and increase their risk of decompression sickness. When in doubt, go thicker.

Planning a trip and not sure what to pack? Tell us where you're headed and when, and the Faneca Expeditions team will give you specific advice based on real conditions — not guesswork.

The Complete Liveaboard Packing Guide — Full packing list for liveaboard trips
Best Time to Dive: A Season-by-Season Guide — Water temperatures by destination and season
Galápagos Diving: What to Expect on Your First Trip — A cold-water destination where exposure protection matters