Lac de Joux Water Temperature
Live water temperature, trend and forecasts
Current water temperature
18,8°C
cool waterLast measurement : 15.09.2026 06:00
24h trend
-0,1°
24h average
19,1°C
Perched at over 1,000 metres of altitude in the Vallée de Joux, this Jura lake is the largest body of water at this elevation in Switzerland. Its temperature naturally stays cooler than that of the lowland lakes: even at the height of summer, the water rarely exceeds 20 to 22°C.
This freshness is precisely its charm on heatwave days: swimming here is invigorating, and the shores — such as the Rocheray beach or the one at Le Pont — remain friendly and family-oriented. Check the live water temperature to know whether today is the right day for a dip.
7-day evolution
Daily average surface water temperatures.
Forecast
Predicted water temperatures for the coming days (simulation).
Tue 15.09
19,1°
Wed 16.09
18,7°
Thu 17.09
18,2°
Fri 18.09
17,8°
Average temperatures month by month
Historical averages of surface water temperature, computed over the period 2012–2024.
| Month | Average | Min – Max |
|---|---|---|
| January | 1,3°C | 0,4° – 2,6° |
| February | 0,5°C | 0,3° – 0,8° |
| March | 1,8°C | 0,8° – 3,1° |
| April | 5,4°C | 3,2° – 7,6° |
| May | 10,9°C | 7,7° – 14,7° |
| June | 17,9°C | 14,9° – 20,0° |
| July | 21,1°C | 20,0° – 21,9° |
| August | 21,0°C | 19,8° – 21,6° |
| September | 17,6°C | 14,9° – 19,6° |
| October | 12,8°C | 11,1° – 14,8° |
| November | 8,9°C | 6,7° – 10,9° |
| December | 4,3°C | 2,7° – 6,5° |
Lake location
Activities around Lac de Joux
Beaches, swimming and family outings around this lake.
Bioux Beach: swimming at altitude at Lake Joux
Want a different swimming experience, at 1004 meters above sea level, in the heart of the Vallée de Joux? The Plage des Bioux, in L'Abbaye, welcomes you for free by the lake of Joux: grass to lay your towel, pebbles by the water, and a true family vacation atmosphere.
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Pointe de Sable Beach: the family swimming spot of Lake Joux
Want to take a swim in nature, at 1000 meters altitude? The Pointe de Sable Beach, in the municipality of Lieu by Lake Joux, is a small wild and free spot, tucked away from the roads. A calm and family-friendly setting, perfect for splashing around, picnicking, and relaxing with family in the heart of the Vallée de Joux.
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Pont Beach: swimming at altitude at Lake Joux
Want a beach day in the mountains, away from the crowd? At the village of Pont, in the municipality of L'Abbaye, the Plage du Pont welcomes you by the shores of Lake Joux, at over 1000 meters altitude. Pebbles, grass, clear water, and fresh air of the Jura: here is a family-friendly and free swimming spot, perfect for relaxing with your family.
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Rocheray Beach: swimming at altitude on Lake Joux
Looking for a swim that really cools you down? At over 1,000 metres of altitude, Rocheray Beach unrolls its lawn on the shore of Lake Joux, with a table and a grill spot. The neighbouring watersports base rounds off the day.
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Rocheray Water Sports: paddle, kayak and pedalo on Lake Joux
What if the children steered the boat? On the shore of Lake Joux, next to the campsite, Rocheray Water Sports rents paddleboards, kayaks and pedalos and offers supervised outings, from a simple accompanied hour to a paddling weekend with a night at the campsite.
View listingFrequently asked questions
What is the water temperature of Lac de Joux today?
Can you swim in Lac de Joux right now?
When is the water of Lac de Joux warmest?
Where does the temperature data come from?
Data provided by Alplakes (Eawag), Simstrat simulation model.
