Lac Léman Water Temperature

Live water temperature, trend and forecasts

Current water temperature

21,8°C

pleasant water

Last measurement : 15.09.2026 06:00

24h trend

+0,2°

24h average

22,0°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).

Tue 15.09

22,0°

Wed 16.09

21,9°

Thu 17.09

21,7°

Fri 18.09

21,5°

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.

Illustration of the Allaman beach on the shores of Lake Geneva, grass and pebbles

Allaman Beach: a natural break by Lake Geneva with family

Allaman, Vaud From 2 years

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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Illustration of the Arabie Park (Jardin Doret) in Vevey by the shores of Lake Geneva

Arabie Park Beach: free swimming for families in Vevey

Vevey, Vaud From 2 years

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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Illustration plate of Baby-Plage in Geneva: small sandy beach by Lake Geneva, shallow water, large shaded plane tree, pier and CGN boat on the lake, children playing in the sand and in the water

Baby-Beach – Geneva

Geneva, Geneva From 3 years

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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Illustration plate of the Bains de Saugy in Genthod: wooden pontoon and floating platform on Lake Geneva, small wading pool for toddlers, swimming ladder, moored sailboats and hills in the distance, with children swimming in the sun.

Bains de Saugy – Genthod

Genthod, Geneva From 3 years

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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Illustration plate of the Bains du Jet d'eau in Geneva: two floating pools bordered by wooden pontoons, children and families swimming, the refreshment stand with terrace and umbrellas, and the Jet d'eau shooting up in the harbor.

Bains du Jet d'eau - Geneva

Geneva, Geneva From 3 years

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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Illustration of the beach of Bâtiaz in Saint-Gingolph on the shores of Lake Geneva with the mountains.

Bâtiaz Beach: family swimming in Saint-Gingolph, at the foot of the mountains

Saint-Gingolph, Valais From 2 years

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.

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Frequently asked questions

What is the water temperature of Lac Léman today?

The current surface water temperature of Lac Léman is 21,8°C, with a 22,0°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 21,8°C, the temperature of Lac Léman is considered 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.

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Data provided by Alplakes (Eawag), Simstrat simulation model.