As you approach Lake Thun, the first thing that strikes you is the contrast between deep-blue water, green lakeside slopes, and the peaks of the Bernese Oberland. The lake covers about 47.69 km² and sits between Thun and the Interlaken area, with villages, lidos, walking paths, castles, and mountain views around its shores. Swimming can be one of the best ways to experience it, but this is open water, so choosing the right place and following local safety guidance matters.
Quick Answer
Yes. Swimming in Lake Thun is generally permitted unless local signs say otherwise, and established lidos provide easier access and useful facilities. Treat it as open water: check weather and warnings, enter cool water gradually, never swim long distances alone, supervise children closely, and stay alert for boats and changing conditions.
Key Takeaways
- Swimming is generally permitted around Lake Thun unless signs or temporary warnings say otherwise.
- Thun, Spiez, Oberhofen, and Faulensee all offer established places to enter the lake, but facilities and supervision differ.
- Do not assume every public swimming area has lifeguards. Oberhofen Lido, for example, specifically states that swimming is not supervised.
- Lake temperature changes with the season, weather, wind, depth, and location, so a fixed summer temperature cannot be guaranteed.
- Swiss lifesaving guidance recommends close child supervision, avoiding alcohol or drugs before swimming, not diving into unknown water, and never swimming long distances alone.
- After swimming, you can enjoy boat trips, canoeing, stand-up paddleboarding, hiking, castles, and lakeside dining.
- Summer offers the easiest combination of warm weather and open lido facilities, although some lakeside access points remain available outside the main bathing season.
Can You Swim in Lake Thun?
Yes. Official tourism guidance for the region says that, unless signs state otherwise, bathing is permitted at locations around Lake Thun and Lake Brienz. That gives you many options, from full-service lidos to smaller lakeside lawns and access points.
You can review the region’s official list of bathing areas on the Interlaken Tourism lidos and open-air pools guide.
Permission to swim does not mean every part of the shoreline is equally suitable. Some places have steps, beaches, lawns, pools, changing rooms, restaurants, or floating platforms, while other sections may be steep, difficult to enter, affected by boat traffic, close to protected areas, or simply less convenient.
Note: Always follow posted signs and temporary restrictions. Weather, water levels, local events, water-quality concerns, or other hazards can change conditions even at a place where swimming is normally allowed.
The History of Swimming around Lake Thun
Swimming and public bathing have been part of life around Thun for generations. Rather than claiming an undocumented centuries-old Lake Thun swimming tradition, there is a clear local historical reference nearby: the Schwäbis River Pool in Thun has welcomed bathers on the River Aare since 1884.
Although Schwäbis is on the Aare rather than directly on Lake Thun, it shows that organized public bathing was established in the Thun area by the late 19th century. You can read the current visitor information for the Schwäbis River Pool.
Today, swimming is much more accessible. Municipal and community lidos around Lake Thun combine direct lake access with lawns, pools, diving areas, restaurants, showers, changing facilities, or equipment rentals. Families, recreational swimmers, athletes, and visitors can therefore choose a setting that matches their ability and comfort level.
That mix of recreation and natural scenery is part of Lake Thun’s appeal. You can swim with mountains in the background, relax on the shore afterward, and combine a short swim with sightseeing or a full day outdoors.
Safety Tips for Swimming in Lake Thun
Lake Thun is open water, so conditions can be very different from a swimming pool. Check the weather before entering, watch for changing wind and waves, and pay attention to local warning signs. If conditions look worse than expected, choose a protected lido or postpone the swim.
Swiss Air-Rescue Rega summarizes the swimming rules of the Swiss Lifesaving Society (SLRG). The guidance includes supervising children closely, avoiding swimming under the influence of alcohol or drugs, allowing your body to adjust before entering the water, never diving into unknown or cloudy water, not relying on inflatable swimming aids for protection in deep water, and never swimming long distances alone. See Rega’s open-water swimming safety guidance.
- Supervise children continuously: Young children should remain within immediate reach around water.
- Know your limits: If you are not a confident open-water swimmer, stay close to shore or use a suitable designated bathing facility.
- Enter gradually: Lake water can feel much colder than the air, especially after sitting in strong sun.
- Never dive into unknown water: Depth and underwater obstacles may not be visible.
- Do not swim long distances alone: Fatigue, cramps, cold, wind, or sudden weakness can become serious away from shore.
- Watch for boats: Choose clearly recognizable swimming areas and remain alert anywhere watercraft operate.
- Do not rely on an air mattress or simple swimming toy as lifesaving equipment: It is not a substitute for swimming ability or a proper personal flotation device.
Warning: Do not assume that a developed lido automatically has lifeguard supervision. Oberhofen Lido specifically states that swimming is not supervised. Check the rules at your chosen location and remain responsible for your own safety and the children with you.
Water Quality and Blue-Green Algae
The Canton of Bern monitors the quality of lakes, rivers, and groundwater through its water and soil protection laboratory. You can check the Canton of Bern water-quality information for monitoring and current topics.
Do not treat clear-looking water as a guarantee that conditions are suitable. If authorities post a swimming warning, follow it. If you notice unusual surface scum, strong discoloration, or signs warning about cyanobacteria or blue-green algae, keep out of the affected water and keep children and pets away as well.
Pro Tip: For your first swim in Lake Thun, use an established lido. Easier entries, toilets, changing areas, non-swimmer facilities, and clearly defined bathing spaces make it simpler to judge conditions than an unfamiliar stretch of shoreline.
Popular Swimming Spots around Lake Thun
| Swimming Spot | Location | Verified Facilities | Access & Safety Note |
|---|---|---|---|
| Thun Lido | Thun | Direct lake access, 50 m and 25 m pools, non-swimmer pool, children’s pool, diving tower, lawn and restaurant | Large managed bathing facility; seasonal entry fee applies |
| Spiez Lido | Spiez | Lake access, heated 50 m pool, non-swimmer pool, diving boards, water slide and restaurant | Good choice for families wanting both lake and pool swimming; seasonal entry fee applies |
| Oberhofen Lido | Oberhofen | Lake access, floating platform, 5 m diving platform, non-swimmer pool, restaurant, SUP and kayak hire | Free entry; official visitor information states that swimming is not supervised |
| Faulensee Lido | Faulensee | Lake steps, floating platform, lawn, changing rooms, toilets and showers | Free admission and listed as accessible year-round |
Thun Lido
Thun Lido, known locally as the “Strämu,” is one of the most complete swimming facilities on the lake. The official listing confirms direct lake swimming, 50 m and 25 m pools, a separate non-swimmer pool, a small children’s pool, a 10 m diving tower, a large lawn, sports areas, and a restaurant.
See the current Thun Lido visitor information before your visit.
Spiez Lido
Spiez is a strong option if you want dramatic views of Spiez Bay and the castle while still having the convenience of a developed bathing complex. The lido combines direct access to Lake Thun with a heated 50 m swimming pool, a non-swimmer pool, diving boards, a long water slide, sports facilities, and a restaurant.
Current details are available from the official Spiez Lido listing.
Oberhofen Lido
Oberhofen offers a more relaxed lakeside setting beside the boat harbour. You can swim from the shore, use a floating platform, enjoy the separate non-swimmer pool, or rent a kayak or stand-up paddleboard. There is also a 5 m diving platform and a restaurant.
Entry is free, but the official visitor information clearly states that swimming is not supervised. See the Oberhofen Lido information.
Faulensee Lido
Faulensee suits visitors who prefer a simple lakeside lawn and direct lake access rather than a large swimming complex. The official listing confirms steps into Lake Thun, a floating platform, changing rooms, toilets, showers, a lawn suitable for picnics, and free admission.
See the Faulensee Lido visitor information for current details.
You can also find quieter bathing areas elsewhere around the lake. These can offer a peaceful atmosphere away from busier facilities, but inspect the entry and exit carefully, respect private property and protected areas, and do not assume an isolated swimming spot is supervised.
Water Temperature and the Best Time to Swim
Lake Thun does not have one fixed summer water temperature. Surface temperature changes with recent weather, wind, sunshine, depth, inflowing water, and the part of the lake where you swim. Warm spells can make the surface comfortable, while deeper water can remain noticeably colder.
Federal hydrological measurements for the Aare at Thun, immediately downstream of the lake, show that summer water temperatures can rise above 20°C, but those measurements should not be treated as a guaranteed Lake Thun temperature for your exact swimming spot. Current and historical federal hydrological data are available through Hydrodaten Switzerland.
For most casual visitors, summer gives the best combination of warmer weather, longer daylight, and seasonal lido facilities. Spring and autumn can still be beautiful for walking, sightseeing, and experienced cold-water swimming, but the water can be considerably colder.
Wildlife and Nature around Lake Thun
The scenery around Lake Thun adds a great deal to the swimming experience. Swans, ducks, and other waterbirds are common sights along the shore, while the surrounding forests, meadows, and hills provide habitat for a wider range of wildlife. Deer or foxes may occasionally be seen away from busy lakeside areas, although wildlife sightings are never guaranteed.
Enjoy animals from a respectful distance and avoid disturbing birds, nesting areas, reeds, and protected shoreline habitats. If you use a kayak, canoe, or SUP after your swim, pay close attention to marked nature zones and local navigation rules.
Bringing binoculars can turn a lakeside walk into a simple birdwatching outing, while a camera is useful for the changing mountain light, castles, and reflections across the lake.
Activities to Enjoy after Swimming in Lake Thun
After a swim, a passenger-boat trip is one of the easiest ways to keep enjoying the lake without more physical effort. BLS currently operates passenger services on Lake Thun throughout the year, although the number and timing of services vary by season. Check the official BLS Lake Thun timetable and boat information.
You can use boats to connect places such as Thun, Spiez, Oberhofen, and the Interlaken side of the lake, making it possible to combine swimming, sightseeing, and lakeside walks without driving between every stop.
If you want to stay active, canoeing and stand-up paddleboarding are also available. The official Lake Thun Canoeing Trail runs along the southern shore and has rental points between Gwatt and Leissigen. The operator requires lifejackets for its rentals and advises users to consider weather, wind, and waves. See the Lake Thun Canoeing Trail.
Hiking is another easy addition. Trails around and above Lake Thun range from gentle lakeside walks to steeper mountain routes. This makes it possible to plan a day with a morning hike, an afternoon swim, and an evening meal overlooking the water.
Local Cuisine and Dining Options near Lake Thun
After swimming and exploring, you will find plenty of places to eat around Thun, Spiez, Oberhofen, and other lakeside villages. Traditional Swiss dishes such as fondue and raclette are widely associated with Swiss dining, while regional restaurants also serve lighter meals, salads, meat dishes, desserts, and seasonal specialties.
Freshwater fish such as perch or whitefish may appear on local menus, but do not assume that every fish dish was caught in Lake Thun. If local origin matters to you, check how the restaurant describes the fish on its menu or ask before ordering.
Several of the established lidos have food on site. Thun Lido has a restaurant, Spiez Lido has a restaurant with a terrace, and Oberhofen Lido has a garden restaurant. This makes it easy to eat without leaving the bathing area.
If you would rather prepare a simple protein-rich snack after a day outdoors, the existing guide to delicious homemade cottage cheese offers another option for refueling after swimming or hiking.
Planning Your Trip to Lake Thun
Summer is the easiest season for a traditional Lake Thun swimming trip because most full-service lidos operate during the warmer months. Thun Lido’s published season runs from around May into September, Spiez Lido operates from May to September, and Oberhofen’s main season runs through summer into September. Faulensee’s lakeside area is listed as open year-round.
Opening hours, admission prices, weather closures, and facility availability can change, so use the official links above when deciding which lido suits your day.
Pack swimwear, a towel, sun protection, drinking water, and footwear suitable for the shoreline. A warm layer is useful for the evening or after a cooler swim. If you plan to spend longer in open water, choose equipment appropriate to your experience and conditions rather than relying on a casual inflatable swimming aid.
Accommodation around Lake Thun ranges from hotels in Thun and Spiez to smaller guesthouses and other lodging around the villages. During busy summer periods, booking ahead gives you a better chance of staying close to the part of the lake you want to explore.
You can also build a broader itinerary around swimming. Boat trips, lakeside walks, Spiez Castle, Oberhofen Castle, mountain excursions, canoeing, and viewpoints around the Bernese Oberland can turn a short swim into a full day or multi-day visit.
Lake Thun is more than a scenic place to photograph from shore. With sensible open-water precautions, a suitable swimming spot, and attention to local conditions, you can enjoy the lake directly and still have time for hiking, boating, food, villages, and mountain views afterward.
Frequently Asked Questions
Is it safe to swim in Lake Thun?
Swimming is generally permitted unless signs say otherwise, but Lake Thun is open water and conditions vary. Check weather and warnings, use a suitable entry point, know your swimming ability, supervise children, and never assume that a lido is supervised.
Are there designated swimming areas around Lake Thun?
Yes. Established options include Thun Lido, Spiez Lido, Oberhofen Lido, Faulensee Lido, and several other bathing areas around the lake. Facilities range from full swimming complexes to simple lawns and lake-access points.
What is the water temperature of Lake Thun?
There is no single fixed temperature. Lake water changes with season, weather, wind, depth, and location. Summer surface water can become comfortable for swimming, but deeper or recently mixed water may be much colder, so enter gradually and judge the conditions on the day.
Are water sports available on Lake Thun?
Yes. Depending on the location and season, you can find canoeing, kayaking, stand-up paddleboarding, sailing, boat hire, and passenger cruises. The Lake Thun Canoeing Trail has several rental stations along the southern shore.
What safety precautions should I take when swimming in Lake Thun?
Check weather and signs, supervise children closely, avoid alcohol or drugs before swimming, enter cool water gradually, never dive into unknown water, stay alert for boats, and never swim long distances alone. Do not treat an inflatable swimming aid as lifesaving equipment.
Can you swim anywhere in Lake Thun?
Official tourism guidance says bathing is generally permitted unless signs say otherwise. However, not every shoreline is practical or safe. Respect warning signs, private property, protected areas, boat traffic, and any temporary restrictions.
Which Lake Thun swimming spot is best for families?
Thun and Spiez are convenient choices for families because they combine lake access with non-swimmer or children’s pools and other facilities. Oberhofen also has a separate non-swimmer pool, but its official listing states that swimming itself is not supervised.
What should I do if there is a water-quality or blue-green algae warning?
Do not swim in an area covered by an official warning. If you notice suspicious surface scum or discoloration, avoid the water until conditions are clarified and keep children and pets away from the affected area.
Sources
- Interlaken Tourism: Lidos & Open-Air Pools — confirms general bathing permission around Lake Thun unless signs state otherwise and lists established bathing areas.
- Interlaken Tourism: Thun Lido — facility, lake-access, pool, diving, restaurant, and seasonal information.
- Interlaken Tourism: Spiez Lido — lake access, swimming pools, diving facilities, water slide, restaurant, and seasonal information.
- Interlaken Tourism: Oberhofen Lido — facilities, free admission, equipment rental, and the important notice that swimming is not supervised.
- Swiss Air-Rescue Rega: Swimming Safely in Open Water — presents Swiss Lifesaving Society swimming-safety guidance.
- Canton of Bern: Water Quality — explains official monitoring of lakes and other waters and provides information on cyanobacteria and current water-quality topics.
