Wetsuit Guide for Portugal: What Thickness Do You Need?

For the Costa Vicentina (Aljezur area), you need a 3/2mm wetsuit from June to September, a 4/3mm in April, May, and October, and a 4/3mm or 5/3mm from November to March with boots recommended in the coldest months. Fit matters more than thickness — a loose 5/3mm will leave you colder than a snug 3/2mm.

How wetsuit thickness works

Wetsuit thickness is written as two numbers: the first is the torso (in millimetres), the second is the limbs. So a 4/3mm suit has 4mm of neoprene on your chest and back (where you lose the most heat) and 3mm on your arms and legs (where you need mobility).

Thicker neoprene = warmer but stiffer. That's the trade-off. You want the thinnest suit that keeps you comfortable for the length of your session — typically 60-90 minutes.

Month-by-month guide for the Costa Vicentina

The Atlantic coast from Aljezur south is slightly warmer than the Lisbon coast and slightly cooler than the south Algarve. Here's what to expect:

A note on upwelling: The Costa Vicentina occasionally gets upwelling events, where deep cold water rises to the surface. This can drop water temperature by 2-3°C unexpectedly, even in summer. It doesn't last long (usually a few days), but if the water feels surprisingly cold on a July morning, that's probably why.

Fit matters more than thickness

This is the most important thing to understand about wetsuits. A well-fitting 3/2mm will keep you warmer than a baggy 5/3mm. Here's why: wetsuits work by trapping a thin layer of water between the neoprene and your skin. Your body heats that water. If the suit is loose, cold water constantly flushes through, and your body can't keep up.

Signs of a good fit:

• Snug everywhere, especially around the neck, wrists, and ankles (where water enters)
• No excess material bunching at the lower back or behind the knees
• You can raise your arms overhead without the suit pulling down hard on your shoulders
• You can bend at the waist without excessive restriction

Signs of a bad fit:

• You can pinch more than a centimetre of neoprene away from your body
• Water pools visibly inside the suit
• The neck seal is loose enough to fit fingers under
• There's a gap at the lower back when you bend forward

When you rent with us, we size your wetsuit based on your height, weight, and build — and we carry enough sizes to get the fit right. If the first suit isn't perfect, we swap it.

Front zip vs back zip

Back zip wetsuits have a long zipper running down the spine with a pull cord. They're easier to get on and off — you step in and pull up the zip. The trade-off is that the back panel has a zip running through it, which can let in more water and restrict flexibility slightly.

Front zip (also called chest zip) wetsuits have a shorter zipper across the upper chest. They're harder to get into (you pull the suit on overhead), but once on, they're warmer and more flexible. The back panel is one solid piece of neoprene with no zip seam, so less water entry.

For rental wetsuits, back zip is more practical — easier for unfamiliar users to put on. If you're buying your own suit and you surf regularly, front zip is generally the better choice for warmth and flexibility.

Caring for your wetsuit

Whether you own your suit or you're renting, good habits extend the life of the neoprene and keep it performing.

• Rinse with fresh water after every session. Salt and sand break down neoprene over time. A quick rinse is enough.
• Hang it to dry in the shade. UV degrades neoprene. Never leave a wetsuit in direct sun or on a hot car bonnet.
• Hang it folded over a wide hanger or rail at the waist. Hanging by the shoulders stretches the suit. Don't use thin wire hangers.
• Don't fold it for storage. Creases weaken the neoprene and can create cold spots. Drape it or roll it loosely.
• Don't use hot water. Lukewarm is fine; hot water damages the glue seams.
• Peel it off carefully. Yanking at the arms or legs tears seams. Roll the neoprene down gently.

When to rent vs buy

Rent if:

• You surf less than a few weeks per year
• You're visiting and don't want to travel with a wetsuit (they're bulky and heavy)
• You're unsure about sizing and want to try before committing
• You're surfing somewhere with different water temperatures than home

Buy if:

• You surf weekly or more
• You have a consistent spot and know your sizing
• You want a custom fit for maximum warmth
• You've outgrown rental quality and want high-end neoprene

For a surf trip to the Costa Vicentina, renting makes sense for most people. You avoid the hassle of travelling with a wet, heavy suit, and we provide the right thickness for your dates automatically — so you don't need to guess what to pack.

What we provide

When you book with us, we match your wetsuit to the season:

• June to September: 3/2mm wetsuit
• April, May, October: 4/3mm wetsuit
• November to March: 5/3mm wetsuit, boots included December through March

Our Premium package includes a changing mat, so you're not standing barefoot on gravel while wrestling into neoprene. For our full gear list, see the surf gear page.

If you're still deciding on gear and timing, our best time to surf Aljezur guide covers conditions month by month, and the surfboard rental guide helps you pick the right board for your level.

FAQ

Can I surf in Portugal without a wetsuit?

In July and August at the warmest, you might manage a short session in just boardshorts or a swimsuit — but most surfers still wear at least a 3/2mm. The water on the west coast rarely gets above 21°C, and after 30 minutes without neoprene, you'll feel it. A wetsuit also protects you from board rash and sun.

What's the difference between a 3/2mm and a 4/3mm wetsuit?

A 3/2mm has 3mm of neoprene on the torso and 2mm on the limbs. A 4/3mm has 4mm and 3mm respectively. The extra millimetre makes a noticeable difference — roughly 2-3°C of added comfort. When you're between sizes, the warmer option is usually the right call.

Do I need boots for surfing in Portugal?

From June to October, no. From November to March, boots are recommended — especially for early morning sessions when the water is coldest. Booties with 3mm thickness are standard. We include them with winter rentals automatically.

How do I know if my wetsuit fits properly?

It should feel snug across your whole body with no loose sections or air pockets. You should be able to move your arms freely overhead and bend at the waist without excessive resistance. The neck seal should sit flush against your skin without choking you. If cold water is constantly flushing through, the suit is too loose.

Is the water warmer on the Algarve south coast than the west coast?

Yes, noticeably. The south-facing coast (Faro, Lagos beaches) can be 2-4°C warmer because it's sheltered from the Atlantic swell and cold upwelling. But the south coast has much less consistent surf. The west coast — where the waves are — is cooler, which is why the right wetsuit matters.

Planning a surf trip to Aljezur? We deliver the right wetsuit for the season, properly sized, to your door. Check pricing or tell us your dates and we'll sort the rest.