Snorkelling in the UK: A Beginner's Guide to Kit, Seasons and Safety
You can snorkel in the UK from late spring to early autumn using a well-fitting mask, a standard snorkel, fins and a wetsuit, and the water will still feel cold. The Scottish Wildlife Trust recommends May to October for beginners, and the RNLI puts the average sea temperature around the UK and Ireland at just 12°C. Start in shallow, sheltered water at a known site, always with a buddy, and never touch the wildlife.
Where to snorkel: start with a marked trail
Wildlife Trusts run self-guided snorkel trails that pick out sheltered spots and explain what you may see:
- Kimmeridge Bay, Dorset. Dorset Wildlife Trust's Kimmeridge Bay snorkel trail runs from May to September from the Fine Foundation Wild Seas Centre. Five buoys mark a 400-metre route across sandy seabed, rocky reef and a Japanese seaweed garden, in calm, shallow water.
- Scotland. The Scottish Wildlife Trust's trail network covers more than 80 locations. Each beach map marks beginner zones (sheltered, close to shore, often standing depth, with easy entry) and advanced zones (deeper, further out and more exposed to wind, swell or current). Build your experience in the beginner zones first.
Anywhere else, the North Wales Wildlife Trust's rule of thumb applies: if it isn't safe to swim, it isn't safe to snorkel. Avoid tidal races, strong currents, busy boat traffic and difficult entry points. Popular swimming beaches make good places to start, and local dive clubs can tell you about specific sites.
When to go, and how cold it gets
From the Scottish Wildlife Trust's snorkelling FAQs:
| What | Guidance |
|---|---|
| Best season for beginners | May to October |
| Scottish sea temperature | Rises from about 9°C in May to a peak of roughly 12.6–15.7°C in August and September |
| Wetsuit, Scotland in summer | 5–7 mm recommended; 5/4 mm (5 mm core, 4 mm arms and legs) is the general suggestion |
| Year-round use | 7 mm or more, or a semi-dry or drysuit |
| Session length, adults, May–October | Set a 30-minute alarm, then start thinking about getting out; leave before you start shivering |
| Children | BSAC allows children to start at 6 if they are confident swimmers; pool training first |
Wherever you are in the UK, remember that snorkelling is slow. You float rather than swim hard, so you chill faster than when swimming. Choose a thickness on the warm side; thicker neoprene is also more buoyant, which helps beginners but makes duck-diving harder. Add neoprene boots, gloves and a hood as the water cools, because hands, feet and head lose heat quickly. A suit also protects against jellyfish stings. Browse full wetsuits.
Check bathing water quality before you go (the Environment Agency in England, SEPA in Scotland), and avoid snorkelling during or for one to two days after heavy rain, when pollution risk rises.
Mask, snorkel and fins
Mask fit test
Move your hair out of the way, press the mask gently against your face without the strap, and breathe in through your nose. It should stay put by suction alone. If it falls away, air is leaking past the seal and water will too. Try several in our diving masks range; face shapes vary, and the right mask is the one that seals on yours.
Snorkel types
| Type | What it does | Good for |
|---|---|---|
| Classic (open tube) | Simple tube; you blow water out of the top | Learning snorkel clearing; duck-diving |
| Semi-dry | Splash guard on top reduces water from waves | Most beginners at the surface |
| Dry | Valve closes the tube when submerged | Surface snorkelling in choppy water |
| Purge valve (any type) | Lets water out near the mouthpiece | Easier clearing |
Practise in a pool first and breathe slowly and normally, as BSAC advises.
What about full-face masks?
The Scottish Wildlife Trust strongly advises avoiding full-face snorkel masks because you can't equalise the air spaces in the mask or your ears underwater. BSAC has reported concerns that some low-cost copies may leak or let carbon dioxide build up. A traditional half mask and separate snorkel lets you duck-dive and equalise, and both are covered by established safety standards. Our snorkel sets pair the two.
Fins
Fins let you cover more distance for less effort. Try them on with your wetsuit boots, as boots change the fit. Put fins on in shallow water and walk backwards, looking over your shoulder; walking forwards in fins is awkward and unsafe.
Staying safe
- Never snorkel alone. Stay close to a buddy and agree a signal with someone watching from the shore. Leave together as soon as either of you wants to get out.
- Be visible. Wear a bright hood or vest and use a brightly coloured tow float, which also gives you something to rest on.
- Check the forecast, tides and currents before you set off, and check conditions again when you arrive.
- Enter the water slowly. Below 15°C, cold water shock can take away control of your breathing. The RNLI's Float to Live advice: tilt your head back with your ears submerged, spread your arms and legs, wait for your breathing to settle (the first effects pass in under a minute), then call for help or swim to safety.
- Carry a phone with signal checked, a first aid kit and warm layers. In an emergency dial 999 and ask for the Coastguard.
- If you have a heart condition, asthma or another health concern, speak to your GP first.
More on cold water and entry technique is in our open water swimming safety guide.
Respecting marine life
Follow the "3 Ts": don't touch, take or tease wildlife. Avoid kicking or standing on the seabed with your fins. Many species, including seals and nesting seabirds, are legally protected from disturbance, so keep your distance and follow the Marine Wildlife Watching Code. Boots also protect your feet from weever fish resting on sandy shallows. Take all litter home.
First-trip checklist
- Sheltered, known site: a trail beginner zone or a calm swimming beach.
- Buddy and shore contact arranged; tides, forecast and water quality checked.
- Mask passes the suction test; half mask and separate snorkel, not full-face.
- Warm enough wetsuit (5/4 mm is the Scottish Wildlife Trust's summer suggestion for Scotland), plus boots, gloves and a hood as it cools.
- Bright tow float; fins tried on with boots.
- Out after about 30 minutes or at the first sign of feeling cold.
You'll find the full range in snorkelling and diving.
Frequently asked questions
When is the best time to snorkel in the UK?
The Scottish Wildlife Trust recommends May to October for beginners, when weather and water temperatures are more favourable. Sea temperatures tend to peak in August and September.
How cold is the sea for snorkelling in the UK?
The RNLI puts the average sea temperature around the UK and Ireland at 12°C. In Scotland, the Scottish Wildlife Trust says it rises from about 9°C in May to roughly 12.6–15.7°C in August and September.
What thickness wetsuit do I need for snorkelling in the UK?
The Scottish Wildlife Trust recommends 5–7 mm for Scottish waters, generally a 5/4 mm suit in summer, and 7 mm or more for year-round use. Snorkelling is slow, so err on the warm side and add boots, gloves and a hood as the water cools.
Are full-face snorkel masks safe?
The Scottish Wildlife Trust strongly advises avoiding them because you cannot equalise the mask or your ears underwater, and BSAC has reported concerns that some low-cost copies may leak or allow carbon dioxide build-up. A half mask with a separate snorkel is the established alternative.
How do I check a snorkel mask fits?
Without using the strap, press the mask gently to your face and breathe in through your nose. It should stay in place by suction; if it falls away, it will leak.