Lake Geneva water temperature
Lake Geneva, Nyon · Lake
The current water temperature at Lake Geneva is 19.8 °C (as of September 20, 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.
Water quality
EU classification: goodMeasurement series & statistics
This measurement series includes 473 data points since July 22, 2026.
Lowest recorded value: 19.8 °C on September 20, 2026 · highest value: 27.2 °C on August 5, 2026.
In September, temperatures have ranged between 19.8 °C and 25.0 °C.
The current value is 2.5 °C below the September average of this series.
Nearby waters
More measuring points: Lake Geneva
Frequently asked questions
Can you swim at Lake Geneva right now?
The current water temperature is 19.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lake Geneva?
Currently 19.8 °C (updated continuously).
How warm is at Lake Geneva in September?
In September, the water temperature recently averaged 22.3 °C.
When is the water warmest at Lake Geneva?
Across the measurement record, August is on average the warmest month (24.8 °C).
How is the water quality at Lake Geneva?
The official classification is: good.
