Wetsuit & water temperature guide

Cold water is the number-one reason people quit surfing too early. Almost every time, the actual problem is the wrong wetsuit — too thin, too leaky, or hoodless in water that needed one. Here’s the honest chart, and the thinking behind it.

The quick reference

Every SE Surf spot page shows live water temperature. Match it to this guide:

Water temp	Wetsuit	Extras
22 °C (72 °F) +	Boardshorts / springsuit	Rash vest for sun
19–22 °C (66–72 °F)	2/2 mm or 3/2 mm	—
16–19 °C (61–66 °F)	3/2 mm	Boots optional at the low end
13–16 °C (55–61 °F)	4/3 mm	Boots in winter
10–13 °C (50–55 °F)	4/3 mm or 5/4 mm	Boots + gloves
7–10 °C (45–50 °F)	5/4 mm	Boots + gloves + hood
below 7 °C (45 °F)	5/4 mm hooded or 6/5 mm	Everything, plus a hot flask

Two honest caveats: wind chill on the beach matters as much as water temp (that’s what the air-temperature line on our spot pages is for), and cheap suits are sold by thickness but judged by seams. A good 4/3 in sealed, taped seams outperforms a bad 5/4.

Why thickness numbers look like that

A “4/3 mm” suit is 4 mm over the torso (keep the core warm, sacrifice anything) and 3 mm over arms and legs (keep paddling easy). Blood priority is the whole design: your body happily sacrifices hands and feet to protect the heart and spine, so suits are built the same way — armour around the chest, flexibility at the limbs.

Seams and zips: where suits actually fail

• Flatlock stitching — cheap, strong, but the needles punch holes. Fine above ~18 °C; flushing at 12 °C.
• Glued and blind-stitched (GBS) — panels glued then stitched inside the neoprene without full penetration. The standard for anything below 16 °C.
• Taped seams — GBS with internal tape. Worth it below 12 °C.
• Chest-zip vs back-zip vs zip-free — chest zips and zip-free designs flush far less water; back zips are easiest to get into. Cold-water surfers usually accept the fiddly entry for the dry ride.

Fit beats everything

A wetsuit is a baselayer, not a garment. It should be tight enough that you can’t pinch more than ~a centimetre of neoprene at the kidney, snug at wrists and ankles, and no air pocket at the lower back. Suits loosen slightly in water. If it pools at the waist, it will pump cold water with every paddle stroke — the exact feeling that makes people think they need a thicker suit when they actually need a smaller one.

Hoods, gloves, boots: the 10 % that does 50 %

Once water drops toward 10 °C, your head and hands decide how long you stay out — core temperature sacrifices extremities first, and a bare head dumps heat fast.

• Boots at the threshold where your feet go numb on the walk in (usually ~13 °C).
• Gloves when your hands stop working for the take-off (~10 °C). Thin 3 mm mitts beat clumsy 5 mm gloves for most surfers.
• Hood below ~8–10 °C, or any time the offshore is ice-cold. It feels claustrophobic for two sessions, then indispensable.

Care: suits die of neglect, not cold

Rinse in fresh water after every surf (salt degrades neoprene and seams), dry in shade inside-out then outside-out, and never on a radiator or car bonnet — heat kills the foam’s cell structure. Fold over a wide hanger rather than hanging by the shoulders. A cared-for 4/3 lasts years; an abandoned one smells like regret by season two.

Reading the numbers on our spot pages

Water temperature on SE Surf comes from the marine model for the exact coordinates of each break, refreshed with each forecast cycle. Compare it with the air temperature and wind: warm water plus cold onshore wind still deserves the full winter kit on the beach, even if the sea itself is gentle. To see the full range this chart covers, browse a cold-water spot like Thurso East or Unstad next to a tropical one like Uluwatu. When in doubt, go thicker — you can always roll back a sleeve, but you can’t add neoprene to a suit you left at home.