What to Wear for Cold Water Swimming: Gear Guide for Every Temperature

One of the most common questions new wild swimmers ask is: do I actually need a wetsuit? The honest answer is: it depends entirely on the water temperature. Get this wrong and you're not just uncomfortable — you're in danger.

Here's a practical, temperature-banded gear guide for every condition you're likely to encounter.

20°C and Above — Summer Swimming (Minimal Kit)

At these temperatures, cold water shock is minimal and even non-swimmers can enjoy a dip safely. Most healthy adults can swim comfortably without a wetsuit.

What to wear:

• Swimwear
• Tow float — non-negotiable in any open water for visibility to boats
• Water shoes if the riverbed or lakebed is rocky
• Sunscreen (yes, you'll be on the surface for a while)

Optional: A lightweight 2mm shorty wetsuit if you're spending long periods in the water.

15°C–19°C — Cool Open Water (Spring / Early Autumn)

Common in UK rivers and lakes from May through June and September through October. Pleasant for acclimatised swimmers; manageable but noticeable for beginners.

What to wear:

• 3mm full wetsuit — provides meaningful thermal protection without restricting movement
• Tow float
• Neoprene swim cap (you lose up to 40% of heat through your head)

Optional: Neoprene gloves if your circulation is poor or you plan to stay in longer than 20 minutes.

10°C–14°C — Cold Water (Late Autumn / Early Spring)

This is the range where cold water swimming starts to demand genuine respect. Cold incapacitation — where your muscles lose function — begins to be a real risk during prolonged immersion. Keep sessions to 10–20 minutes maximum at this range.

What to wear:

• 4mm–5mm full wetsuit
• Neoprene gloves (3mm–5mm)
• Neoprene socks (3mm)
• Tow float
• Two neoprene swim caps or a neoprene hood

Post-swim: A dry robe or large changing poncho is essential — your core temperature will continue dropping after you exit the water, and wind chill accelerates this.

6°C–9°C — Very Cold Water (Winter)

Winter wild swimming is genuinely transformative — but only for those who have built up gradually. Do not attempt this range without prior acclimatisation and ideally a swim partner.

What to wear:

• 5mm–7mm wetsuit or drysuit (drysuits are the gold standard for extended winter swims)
• 5mm neoprene gloves
• 5mm neoprene socks or boots
• Neoprene hood
• Tow float

Time limits: Even in full kit, limit immersion to 5–10 minutes until you understand your personal cold tolerance.

Below 6°C — Ice Swimming

This is a specialist discipline practised by experienced cold water athletes. Never ice swim alone, always have shore support, and keep immersion under 5 minutes unless you are a trained ice swimmer with verified experience.

What to wear: Most ice swimmers go without a wetsuit by choice for competitive or training purposes — but if you're new to sub-6°C water, a drysuit and full neoprene accessories are the sensible choice.

The Kit You Always Need, Regardless of Temperature

• Tow float — buoyancy aid and visibility marker
• Dry robe or towelling poncho — for fast warming post-swim
• Someone who knows where you are — never wild swim alone, especially in cold or remote conditions

Know Before You Go

Gear alone doesn't make a cold swim safe — knowing the exact water temperature before you arrive does. Our app provides live water temperature readings and recent condition logs for hundreds of wild swimming spots, so you can match your kit to reality, not guesswork. Check the temp, pack accordingly, and get in.