Wild Swimming in North Wales: 5 Beginner-Friendly Lakes in Eryri (Snowdonia)

Wild swimming in Eryri’s (Snowdonia’s) mountain lakes is cold, exhilarating and surprisingly accessible – even if you’ve never done it before. The water temperature hovers around 12-16°C in summer (cold enough to take your breath away), but with the right approach and location, it’s one of North Wales’s most rewarding experiences.

That sharp intake of breath as you wade in, the buzz that lasts for hours – it connects you to the landscape in a way no viewpoint or photograph ever could. But if you’re new to it, the idea can feel daunting. Where do you start? Which lakes are safe? What kit do you need?

If you’re reading this in January, planning your summer, you’re ahead of the game. Bookmark this guide now, and when the weather warms up, you’ll know exactly where to go.

This guide is for beginners. We’ve chosen five accessible spots where you can dip your toes (or dive straight in) with confidence. All are within easy reach of our holiday cottages in the Conwy Valley, and each offers something different depending on what you’re after.

---

Safety First: The Golden Rules

Before we get to the lakes, let’s cover the basics. Wild swimming is safe when you respect the water and prepare properly.

---

1. Llyn Geirionydd (The Local Choice)

This is the most accessible lake near our cottages and the one we recommend most often to guests. It sits above Trefriw and Betws-y-Coed, tucked into the folds of Gwydir Forest. The water is clear, the setting is beautiful and it’s popular enough that you’ll usually have company (which means safety and a friendly atmosphere).

There’s a designated powerboat and ski zone here (particularly active on summer weekends), so stick to the clearly marked swimming and paddling areas. The buoys are there for your safety. Stay within them.

Parking: Small free car park right at the water’s edge. It fills up fast on sunny summer weekends, so arrive early (before 10am) or visit midweek.

Dog rules: Very dog friendly. Most swimmers bring their dogs. Just clean up after them and keep them under control near other people.

Food: Nothing on site. Bring a flask and snacks, or head back down to Trefriw afterwards for the Fairy Falls Hotel.

---

2. Llyn Padarn, Llanberis (The “Beach” Vibe)

Llyn Padarn has official Bathing Water status, which means it’s regularly tested and monitored for water quality. That’s reassuring for beginners. The Lagoons area at the eastern end has a shallow, gentle entry that feels almost lagoon-like. It’s sandy underfoot and the views across to the old Slate Museum and the mountains beyond are impressive.

This is also a canine paradise. You’ll see more dogs swimming here than anywhere else in Eryri. If your dog loves water, bring them.

Parking: Large pay and display car park at the Lagoons.

Food: Pete’s Eats in Llanberis village is a climbers’ institution. Snowdonia Watersports (near the lake) has a café.

After your swim, warm up in your private hot tub back at the cottage while watching the sun set behind the Carneddau, the full mountain range visible from your hot tub.

---

3. Llyn Mymbyr, Capel Curig (The View)

The reflection of Yr Wyddfa (Snowdon) on still mornings is one of North Wales’s most iconic sights, and swimming in it is unforgettable. Llyn Mymbyr sits directly beneath the Snowdon Horseshoe, and the setting is one of Eryri’s finest.

The lake is easily accessible from the A4086, with a layby near Plas-y-Brenin National Outdoor Centre. You can be in the water within five minutes of parking.

Parking: Roadside layby (free but limited).

Dog rules: Dogs welcome. Keep them on a lead near the shore because of farm animals in the area.

Food: Plas-y-Brenin has a café and bar with a terrace overlooking the lake. Perfect for post-swim hot chocolate.

---

4. Llyn Gwynant (The Pizza & Paddle)

Lower altitude means warmer water (relatively speaking). Llyn Gwynant sits in the Nant Gwynant valley and has a family-friendly campsite vibe. The lake is popular with paddleboarders, kayakers and families. It feels relaxed and sociable.

The bonus? Cegin Gwynant at the campsite often does wood-fired pizzas (check opening times). There’s something brilliant about swimming, then eating pizza by the lake.

Parking: Roadside laybys on the A498 or paid parking at the campsite.

Dog rules: Dogs welcome.

Food: Cegin Gwynant (seasonal, check times).

If you’re bringing a wetsuit and other gear, you’ll appreciate having a cottage with a drying room like Laurel. The utility room is perfect for wet wetsuits and muddy walking boots.

---

5. The Watkin Pools (The Instagram Dip)

This isn’t a lake. It’s a series of crystal-clear plunge pools and waterfalls along the Watkin Path (one of the classic routes up Yr Wyddfa). The water is incredibly clear, the rock formations are dramatic and the whole setting feels like something from a fantasy novel.

This isn’t the place for swimming lengths or long sessions. It’s for a quick, exhilarating dip in dramatic surroundings.

Beginner note: This is the most adventurous option on this list. The hike, slippery rocks and remote location make it better suited as your third or fourth wild swim rather than your first. Start with Llyn Padarn or Llyn Geirionydd, build your confidence, then tackle this when you’re ready for something more challenging.

Safety note: The rocks can be very slippery, especially after rain. Take your time. Wear shoes with good grip until you’re ready to get in.

Parking: Pont Bethania car park (pay and display). You’ll need to walk 20-30 minutes up the Watkin Path to reach the pools.

---

Planning Your Summer Swimming Holiday?

f you’re reading this in January, you’re ahead of the game. Our cottages combine wild swimming access (all five lakes within 45 minutes) with the comfort of a heated pool and private hot tubs for post-swim warmth. Summer weekends book months ahead. Check availability now to book your stay.

---

Do You Need a Wetsuit?

For beginners, or for any swim lasting longer than a few minutes, yes.

In high summer (July and August), experienced swimmers often go in just their swimsuits (what wild swimmers call “skins”). But even in summer, these mountain lakes are cold. Most hover between 12-16°C. That’s cold enough to take your breath away.

A 3mm or 5mm wetsuit will let you stay in longer, enjoy the experience more and warm up faster afterwards. You can hire wetsuits from outdoor shops in Betws-y-Coed and Llanberis if you don’t want to buy one before you’ve tried wild swimming.

But here’s the most important kit: warm layers for afterwards. A thick fleece, a woolly hat, a hot drink in a flask.

Remember, getting warm after your swim matters more than anything you wear in the water.

---

What About Dogs?

Llyn Padarn and Llyn Geirionydd are the best choices for dogs. Both have gentle, gradual entries (important for nervous dogs) and plenty of space away from other swimmers. The sandy bottom at Llyn Padarn’s Lagoons area is particularly good for first-timers.

Our cottages welcome up to two dogs per cottage (£35 per dog), and with over an acre of gardens, they’ll have space to properly dry off and settle down after their swim.

---

When the Weather Turns

Let’s be honest. Welsh weather is unpredictable. If you wake up to rain and wind, wild swimming might not appeal. That’s fine. You have options.

Our cottages have a heated indoor pool (shared between a maximum of nine guests) and private hot tubs. On a grey day, there’s something perfect about swimming indoors, then retreating to your own hot tub with a book, glass of wine and themCarneddau mountains in view, no other guests in sight.

We’ve written a full guide to rainy day activities in North Wales if you need inspiration.

---

Your First Wild Swim

Start with Llyn Padarn or Llyn Geirionydd. Both are accessible, sociable and beautiful. Go on a calm day with good visibility. Bring a friend. Enter slowly. Don’t push yourself to stay in longer than feels comfortable.

If it’s for you, you’ve just discovered one of the best reasons to keep coming back to Eryri. And having a heated pool and hot tub to warm up in afterward makes even those cold, drizzly days feel like an adventure!

Ready to book your wild swimming getaway?

---

FAQs

Is wild swimming safe in Eryri (Snowdonia)?

Yes, if you choose accessible lakes like Llyn Padarn or Llyn Geirionydd and follow basic safety rules. Mountain lakes are very cold year-round, so always check the weather, wear a bright tow float and never jump into unknown water. Cold water shock is real and can happen even to experienced swimmers. Enter slowly, acclimatise gradually and always swim with someone else.

Do I need a wetsuit to swim in North Wales?

For beginners or any swim longer than a few minutes, yes. In summer (July and August), experienced swimmers often use just swimsuits (called “skins”), but even in summer these lakes are cold (12-16°C). A 3mm or 5mm wetsuit lets you stay in longer and warm up faster. The most important kit is warm layers for afterwards: a thick fleece, woolly hat and hot drink in a flask.

Can I take my dog wild swimming in North Wales?

Absolutely. Llyn Padarn and Llyn Geirionydd are the best spots. Both have gentle entries, plenty of space and a dog-friendly atmosphere. Just bring a towel to dry them off and keep them under control near other swimmers, fishermen and livestock. Most wild swimmers in Eryri bring their dogs. It’s part of the experience.

Which lake is best for complete beginners?

Llyn Padarn at Llanberis. It has official Bathing Water status (regularly tested for water quality), a gentle shallow entry at the Lagoons area, good parking and facilities nearby. The atmosphere is relaxed and sociable, so you won’t feel self-conscious about being new to wild swimming.

What’s the water temperature in Eryri lakes?

In summer (July and August), mountain lakes in Eryri typically range from 12-16°C. That’s cold enough to take your breath away. Always enter slowly to let your body acclimatise. Winter and spring temperatures drop to 8-12°C and are only recommended for experienced cold water swimmers with proper equipment and training.

When is the best time of year for wild swimming in Eryri?

July and August offer the warmest water (12-16°C) and longest daylight, making them ideal for beginners. May, June and September are quieter with similar conditions. Many experienced swimmers continue year-round, but winter swimming requires proper training, thicker wetsuits (5mm+) and careful attention to weather conditions.

Is wild swimming allowed in all the lakes?

Most lakes in Eryri welcome swimmers, but always check for local signage or restrictions. Llyn Geirionydd has a designated powerboat zone, so stay within the marked swimming areas. Some lakes (like those in Denbigh Moors) are reservoirs that supply drinking water and don’t allow swimming. When in doubt, ask locally or check with the landowner.