Swimming in Lake Windermere – Everything You Need to Know

Lake Windermere draws hundreds of thousands of visitors each year with its clear waters and stunning mountain views.

Wild swimming in the lake is increasingly popular, yet the lake has cold temperatures and other serious risks to consider before taking a dip.

This post covers all the important factors you need to know for a safe and enjoyable swim in this famous Lake District lake.

Can You Swim in Lake Windermere?

You can swim in Lake Windermere, a popular location for open-water swimming.

Many people enjoy short swims or longer challenges, depending on their fitness levels and experience.

The lake spans 10.5 miles, the longest in England. No lifeguards patrol the shores, so plan your swim with care.

It is wise to check local updates before you go, as conditions change.

Related: Shopping in Windermere

Issues With Sewage in Lake Windermere

Sewage spills affect Lake Windermere. In 2024, United Utilities released untreated waste on over 140 days, with similar issues this year.

This leads to high bacteria levels, especially in summer. The Big Windermere Survey found poor bathing quality across most of the lake from June to September.

Avoid swimming after heavy rain when spills rise. Groups like Save Windermere push for cleaner water.

Safety Tips for Windermere Swimming

Stay safe by swimming with a friend. Wear a bright cap and tow a float to stay visible to boats.

Enter the water slowly to avoid cold shock. Check weather forecasts for wind or rain. Do not swim alone or after alcohol.

Walk in first to test depth and currents. If you feel tired, float on your back. Call 999 if in trouble.

Related: Things to Do in Windermere at Night

Good Places to Swim

Pick calm spots for your swim. Fell Foot Park at the south end has grassy areas and easy entry, run by the National Trust with facilities.

Millerground near Bowness offers pebbly shores and parking.

Borrans Park in Ambleside suits longer swims with open water.

Low Wray and Harrowslack provide quieter bays. Avoid busy boat lanes.

Where to Stay Near Lake Windermere

Laik provides luxury self-catering holiday cottages and apartments close to Lake Windermere.

These stays offer comfort and quick access to swimming spots and lake views.

Choose from options that suit couples, families, or groups, with modern amenities for a relaxing base after your dip.

Average Water Temperatures

Water in Lake Windermere stays cold year-round.

In summer, it reaches 14-15°C in July and August. Spring averages 8.1°C, autumn around 11°C, and winter drops to 4.9°C.

A wetsuit helps in all seasons. Warmer months feel best for most swimmers.

Wildlife to Watch Out For

Watch for blue-green algae, which can form blooms and cause skin rashes or stomach issues.

In 2025, levels exceeded safe limits in parts of the lake.

Bacteria from sewage pose infection risks if you swallow water.

Birds like swans can act protectively near nests.

Fish and midges are common but not harmful.

Check for algae warnings before entering.

Water Quality and Monitoring

The Environment Agency and groups like the Freshwater Biological Association monitor the lake.

The 2025 Big Windermere Survey tested over 1,000 samples and rated summer water quality as poor due to bacterial contamination.

Phosphorus levels are good in some basins, but algae blooms persist.

Check the Love Windermere site for real-time data. Improvements are underway to reduce pollution.

Best Times to Swim

Swim in summer from June to August when the water warms up. July and August offer the highest temperatures, around 15°C.

Early morning or late afternoon avoids crowds and boats.

Spring and autumn suit experienced swimmers, but winter dips are for the hardy.

Rules and Regulations

Follow Lake District rules to protect the area. Swim in designated spots and yield to boats.

No diving from shores in Windermere Byelaws areas. Do not litter or disturb wildlife.

Private land surrounds parts of the lake, so stick to public access.

Events need permits. Respect other users like rowers.

What to Pack for a Swim

Pack a wetsuit for warmth, plus goggles and a swim cap. Bring a towel, dry robe, and flip-flops.

A tow float and buddy line aid safety.

Add sun cream, water bottle, and snacks.

First aid kit covers cuts from rocks. A waterproof bag keeps clothes dry.

Organised Swimming Events on Lake Windermere 2026

Here are the key organised open water swimming events on Windermere this year:

Great North Swim (12–14 June at Brockhole)

The UK’s biggest open water festival with distances from 250m up to 10km. Fantastic atmosphere and full safety support.

Epic Lakes Swim Windermere (9 August at Waterhead, Ambleside)

Distances: 750m, 1.5km, 3km and 5km. Relaxed, well-organised swims suitable for most abilities.

Windermere One Way (15 August)

Iconic 11-mile full-length crossing with a dedicated support paddler for every swimmer.

Chillswim Windermere (5 September)

Popular 11-mile end-to-end swim from Fell Foot to Waterhead, with feed stations and pace waves.

BLDSA 2-Way Windermere (1–2 August)

Traditional 21-mile there-and-back marathon swim for experienced long-distance swimmers.

Most of these events sell out early. Visit the official organiser websites for entry details, prices and the latest information.

Health Advice Before Swimming

See a doctor if you have open wounds or health issues. Do not swallow lake water to avoid bacteria.

Shower afterwards to rinse off algae or pollutants.

Watch for rashes or tummy upset post-swim. Stay hydrated and eat well.

Build cold tolerance if new to open water.

Environmental Considerations

Help keep the lake clean by leaving no trace. Pick up litter and use bins. Avoid soaps in the water. Report spills to the Environment Agency.

Support campaigns like Love Windermere.

Sustainable choices protect this beauty for others.

Nearby Facilities and Access

Access points have parking at Fell Foot and Borrans Park. Changing rooms and toilets are available at National Trust sites.

Buses run to Bowness and Ambleside. Cafes nearby serve food after swims. Rent gear from local shops like Swim The Lakes.

Windermere Winter Swimming

Winter swimming in Lake Windermere appeals to hardy swimmers seeking a challenge.

Water temperatures fall to around 5°C from December to February, with shorter days and possible frost.

Use a full wetsuit, neoprene gloves, hood, and boots to stay warm.

Enter the water gradually to prevent cold shock, and keep swims brief, 5 to 10 minutes, to avoid hypothermia.

Always go with others, have hot drinks and dry layers ready on shore, and monitor for signs of distress.

Calm spots like Fell Foot Park suit winter dips, but check for ice edges or high winds. Build up tolerance gradually and consult a doctor first.

About Lake Windermere

Lake Windermere lies in the Lake District National Park in Cumbria. It measures 10.5 miles long and up to a mile wide, making it the largest natural lake in England.

Glaciers shaped the area thousands of years ago, leaving deep waters that reach 219 feet at the deepest point.

The lake feeds into the River Leven and borders villages such as Bowness-on-Windermere and Ambleside.

Surrounded by fells and woodlands, it supports boating, fishing, and swimming. Over 15 million visitors come each year to enjoy its views and activities.

Some Final Notes On Wild Swimming in Windermere Lake

Swimming in Lake Windermere is rewarded with stunning scenery, but safety and water quality matter most.

Follow tips and check updates for a great experience. Book a stay with Laik.co.uk to base your Lake District trip near the water.