Lac Léman water temperature

Lac Léman, Thonon-les-Bains · Lake

The current water temperature at Lac Léman is 23.3 °C (as of September 1, 2026, source: Eawag/Alplakes model).

Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.

23.3 °C

Measured: September 1, 2026 · continuously updated

💧 Water 23.3° · ☀️ Air 11.3° · high today 22.1°

Temperature trend of recent weeks

Lac Léman — Photo: Dmitry A. Mottl · CC BY-SA 4.0 · Wikimedia Commons

Measurement series & statistics

This measurement series includes 477 data points since July 3, 2026.

Lowest recorded value: 21.0 °C on July 4, 2026 · highest value: 27.5 °C on August 13, 2026.

Nearby waters

Lac Léman, Évian-les-Bains · 9.0 km away23.1 °C Aubonne, Allaman, Le Coulet · 12.6 km away11.5 °C Promenthouse, Gland, Route Suisse · 16.5 km away14.2 °C Lake Geneva, Lausanne, Vidy · 17.5 km away22.9 °C Lake Geneva, Nyon · 18.7 km away22.4 °C

More measuring points: Lac Léman

Évian-les-Bains23.1 °C

Frequently asked questions

Can you swim at Lac Léman right now?
The current water temperature is 23.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Lac Léman?
Currently 23.3 °C (updated continuously).

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