Lac Léman Water Temperature
Live water temperature, trend and forecasts
Current water temperature
25,9°C
very pleasant waterLast measurement : 30.07.2026 21:00
24h trend
+0,7°
24h average
25,3°C
The largest lake in Western Europe, Lake Geneva borders French-speaking Switzerland from Geneva to Villeneuve, passing through Nyon, Morges, Lausanne, Vevey and Montreux. Its water temperature varies greatly with the seasons: cool in spring despite the first sunny days, it becomes ideal for swimming in summer, regularly exceeding 22 to 25°C near the shores.
With its many family-friendly beaches, lakeside pools and snack bars, Lake Geneva is a summer must for families. Before heading out for a swim with the kids, check the live water temperature here, along with the 24-hour trend and the forecast for the coming days.
7-day evolution
Daily average surface water temperatures.
Forecast
Predicted water temperatures for the coming days (simulation).
Thu 30.07
25,3°
Fri 31.07
25,5°
Sat 01.08
25,8°
Sun 02.08
26,1°
Mon 03.08
26,4°
Average temperatures month by month
Historical averages of surface water temperature, computed over the period 1983–2024.
| Month | Average | Min – Max |
|---|---|---|
| January | 6,8°C | 6,4° – 7,4° |
| February | 6,3°C | 6,2° – 6,4° |
| March | 6,5°C | 6,2° – 6,9° |
| April | 8,1°C | 7,0° – 9,6° |
| May | 12,2°C | 9,7° – 15,0° |
| June | 17,7°C | 15,1° – 20,2° |
| July | 21,3°C | 20,3° – 22,2° |
| August | 21,8°C | 20,9° – 22,2° |
| September | 19,0°C | 17,2° – 20,7° |
| October | 15,1°C | 13,2° – 17,1° |
| November | 11,3°C | 9,6° – 13,1° |
| December | 8,3°C | 7,4° – 9,5° |
Lake location
Activities around Lac Léman
Beaches, swimming and family outings around this lake.
Are you looking for a quiet spot by Lake Geneva for a family outing in Allaman? Allaman beach, on La Côte, is a public and free beach featuring grass, pebbles, and large trees. A natural place, away from large infrastructures, perfect for wading, picnicking, and relaxing.
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Want a day by Lake Geneva without spending a dime? The Plage du Parc de l'Arabie, in Vevey, combines a large shaded lawn, a small pebble beach, and playgrounds for children, all with free access. The perfect spot for splashing around and picnicking with family, right?
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Want a day by the lake without leaving the city? In the heart of Eaux-Vives, Baby-Plage offers a small sandy and grassy beach, shallow water, and a playground just steps away: the perfect spot for a family outing, and it's free!
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Want a day by the water with the kids, without crowds or complications? The Bains de Saugy, in Genthod, offer a small free beach on Lake Geneva, with a wading pool designed for little ones and a very gentle family atmosphere.
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Feeling like a refreshing swim in the heart of the harbor, right under the famous Jet d'eau? The Bains du Jet d'eau offer your family two floating pools in the lake, with a space designed for children and a team of lifeguards on site all summer long.
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And what if you offered your children a day of swimming at the foot of the mountains? At the entrance of the border village of Saint-Gingolph, on the Valais side, the Plage de la Bâtiaz stretches its fine sand along Lake Geneva, with a magnificent view of the Riviera and the Dents du Midi.
View detailsFrequently asked questions
What is the water temperature of Lac Léman today?
The current surface water temperature of Lac Léman is 25,9°C, with a 25,3°C average over the last 24 hours. Data is updated several times a day.
Can you swim in Lac Léman right now?
With water at 25,9°C, the temperature of Lac Léman is considered very pleasant for swimming. Always keep an eye on children near the water.
When is the water of Lac Léman warmest?
Over the period 1983–2024, the water of Lac Léman is on average warmest in August, at around 21,8°C at the surface.
Where does the temperature data come from?
Temperatures come from the Alplakes scientific platform, developed by Eawag (the Swiss Federal Institute of Aquatic Science and Technology). They are produced by the Simstrat simulation model, calibrated with real measurements.
Data provided by Alplakes (Eawag), Simstrat simulation model.