Lac Léman water temperature
Lac Léman, Thonon-les-Bains · Lake
The current water temperature at Lac Léman is 16.7 °C (as of October 16, 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.
Measurement series & statistics
This measurement series includes 480 data points since August 17, 2026.
Lowest recorded value: 16.4 °C on September 26, 2026 · highest value: 25.7 °C on August 19, 2026.
In October, temperatures have ranged between 16.5 °C and 18.5 °C.
The current value is 0.8 °C below the October average of this series.
Nearby waters
More measuring points: Lac Léman
Frequently asked questions
Can you swim at Lac Léman right now?
The current water temperature is 16.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lac Léman?
Currently 16.7 °C (updated continuously).
How warm is at Lac Léman in October?
In October, the water temperature recently averaged 17.5 °C.
When is the water warmest at Lac Léman?
Across the measurement record, August is on average the warmest month (23.9 °C).
