Lac du Bourget water temperature
Lac du Bourget, Le Bourget-du-Lac · Lake
The current water temperature at Lac du Bourget is 17.9 °C (as of October 19, 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 480 data points since August 21, 2026.
Lowest recorded value: 17.5 °C on October 19, 2026 · highest value: 26.6 °C on August 21, 2026.
In October, temperatures have ranged between 17.5 °C and 21.6 °C.
The current value is 1.8 °C below the October 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 17.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lac du Bourget?
Currently 17.9 °C (updated continuously).
How warm is at Lac du Bourget in October?
In October, the water temperature recently averaged 19.7 °C.
When is the water warmest at Lac du Bourget?
Across the measurement record, August is on average the warmest month (25.9 °C).
How is the water quality at Lac du Bourget?
The official classification is: excellent.
