Lac du Bourget water temperature
Lac du Bourget, Le Bourget-du-Lac · Lake
The current water temperature at Lac du Bourget is 26.0 °C (as of September 4, 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.
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Water quality
EU classification: excellentMeasurement series & statistics
This measurement series includes 475 data points since July 6, 2026.
Lowest recorded value: 25.1 °C on September 4, 2026 · highest value: 28.1 °C on July 17, 2026.
In September, temperatures have ranged between 25.1 °C and 26.3 °C.
The current value is 0.3 °C above the September average of this series.
Nearby waters
More measuring points: Lac du Bourget
Frequently asked questions
Can you swim at Lac du Bourget right now?
The current water temperature is 26.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lac du Bourget?
Currently 26.0 °C (updated continuously).
How warm is at Lac du Bourget in September?
In September, the water temperature recently averaged 25.7 °C.
When is the water warmest at Lac du Bourget?
Across the measurement record, July is on average the warmest month (26.8 °C).
How is the water quality at Lac du Bourget?
The official classification is: excellent.
