There are places that tempt you to dip a toe in. And then there’s the Isles of Scilly, where the water is so impossibly clear and inviting that wild swimming becomes less of an activity and more of a way of life.
Just 28 miles off the coast of Cornwall, this scatter of low-lying islands feels wonderfully remote. Yet step onto the quay at St Mary’s and you quickly realise that the Atlantic here has a gentler, Caribbean hue. Turquoise shallows lap against white sand; granite headlands shelter secret coves; and the sea, thanks to the Gulf Stream, is often warmer than you might expect.
For wild swimmers, this is paradise.
The temperatures can be a little bracing, from about 10C degrees in the winter to about 17C degrees in the summer months.
Morning Dips and Empty Beaches
Start the day early at Porthcressa Beach. As the sun rises over Hugh Town, the sea lies calm and glassy, perfect for a bracing swim before breakfast. The water clarity is extraordinary, you can often see ripples in the sand several metres below you.
Over on St Martin’s, Great Bay offers a long crescent of sand and gently shelving water ideal for longer swims. It’s the kind of place where you can wade out slowly, feeling the temperature shift, before committing to a steady front crawl parallel to the shore. With barely a building in sight, it feels deliciously untamed.
Meanwhile, Tresco’s Appletree Bay is a favourite among locals for its sheltered aspect and luminous water. Bring goggles and you’ll likely spot small fish darting through seagrass beneath you.
Swimming on St Mary’s
Porthcressa Beach and Little Porth, located in Hugh Town, is the closest to Tregarthen’s, only a 5-minute walk down the main street. There is a promenade above the beach, with a grassy area popular for picnics. Calm waters, sheltered on both sides by rocky outcrops, provide safe swimming and safe anchorage.
Town Beach is a perfect place to sit and watch the Scillonian arrive and depart or swim through local boats and crystal-clear waters. You can also swim around to Porthmellon Beach with views of the lifeboat station. Town Beach is a 7-minute walk from Tregarthen’s (via the strand road) or on a low tide you can access this beach beside of the Mermaid pub.
Pelistry and Tolls Island is known for its views of the Eastern Isles and the quiet setting is perfect for a long calm swim. Pelistry is located a 35 minute walk from Tregarthen’s. The walk to this beach is a staff favourite, heading past island farms and seeing the more remote parts of the island. On a low tide you can even walk across to Tolls Island.
Bar Point, arguably one of the most beautiful beaches on the Island, offers total tranquillity and amazing views. This beach is furthest from Tregarthen’s, approximately 1 hour and 30 minutes away, yet well worth the coastal walk. There are views of Tresco, Bryher and Samson, and you can often glimpse the Scillonian arriving to make her way to the quay.
Swim Between Islands
One of the joys of swimming on Scilly is how close the islands sit to one another. On calm days, confident swimmers can take on short inter-island crossings with proper planning and safety support. The channel between Bryher and Tresco, for example, is popular at slack tide, though currents demand respect and local knowledge.
For something more relaxed, boat drop-offs open up otherwise inaccessible beaches. A water taxi can land you on a quiet stretch of sand on Bryher, where you may well have the entire cove to yourself. Swim, float on your back and watch the sky!
Natural Sea Pools and Hidden Coves
Scilly’s granite geology creates natural pools that fill with each tide. On St Agnes, rocky inlets offer sheltered spots perfect for exploratory dips. The water here takes on shades of aquamarine and jade, contrasting with the dark stone.
Low tide reveals secret corners across the islands, places where you can swim in calm, waist-deep water with nothing but seabirds for company. It’s wild swimming at its most elemental.
Safety and Seasons
The swimming season stretches from late spring through early autumn, with July to September offering the warmest sea temperatures. A wetsuit is advisable outside the height of summer, particularly for longer swims. Always check tide times, be mindful of currents, and never underestimate Atlantic conditions.
Local boatmen are invaluable sources of advice. And if you prefer company, informal swimming groups often form during peak season.
The Simple Joy of It
What makes wild swimming on the Isles of Scilly so special isn’t just the clarity of the water or the beauty of the beaches. It’s the stillness. The absence of noise. The sense that you’ve discovered somewhere quietly extraordinary.
Here, you don’t rush. You swim out, turn onto your back, and let the salt hold you. Above, wide Atlantic skies. Around you, nothing but blue.
