Lake GenevaWater level today

378.97m a.s.l.

+4 cm since yesterday

Measured20 minutes ago

Arve, Genève (inflow) · Bundesamt für Umwelt (BAFU)

Change across the visible readings

+4 cm

09/20 – 09/21

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View water balance →Year comparison →Temperature profile →

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7-day trendCalculated-12cmThe level is falling.View history Water temperatureModelled20.9°CPleasant for swimming · modelled value at 1 m depthSource: Alplakes (Eawag) – Simstrat-Modell, measurement site Modellierte Seetemperatur (1 m Tiefe) · 1 hour ago · also measured at Aubonne, Allaman, Le Coulet (Temperatur): 16.2 °CTemperature profile WeatherMeasured20.3°C0.0 mm rain in 24 hGenève / Cointrin · 1 hour agoWeather history Water balanceCalculated-126.3m³/sMeasured outflows exceed inflowsInflows and outflows

Water temperature compared with usual

Very lowNormalVery high

usual range

High — 1.2 °C above the median — higher than usual for this calendar day (reference period 2023–2026).

Forecast

Source: FOEN forecast

The forecast value is expected to remain stable across the 6 displayed forecast days.

Today09/21379.06m a.s.l.

Tue09/22379.07m a.s.l.

Wed09/23379.06m a.s.l.

Thu09/24379.03m a.s.l.

Fri09/25379.00m a.s.l.

Sat09/26378.98m a.s.l.

Forecast

Source: FOEN forecast

Median
Min./Max.
Measured

The line shows the median of the FOEN model forecasts at each timestamp; the band shows their minimum and maximum. Daily cards average the available hourly medians, which is not a daily median. A wider band means greater spread between model paths, not guaranteed upper or lower limits. Partial days may contain fewer forecast values.

Today at the lake

The current picture

A factual data summary – not a safety or swimming clearance.

Water temperature

20.9 °C

Pleasant

Modelled

Wind

18.7 km/h

Noticeable wind

Measured

Precipitation, 24h

0.0 mm

Dry

Measured

What's happening?

Measured outflows exceed inflows

-126.3 m³/s

The level has been falling for a week.

-0.12 m ü. M. · over 7 days

Weather at the lake

20.3°Air temperature

0.0mmRain, last 24 h

18.7km/hWind

10.9–24.3°Day range

0.0 mm in 48 h · 0.0 mm over 7 days · Gusts 40.3 km/h · 50 % humidity

Source: MeteoSwiss, station Genève / Cointrin · 1 hour ago

UV index

Low

0Daily maximum 5

Course of the day

No protection needed.

Source: Open-Meteo

Recent events

44 minutes ago

↑Rhône, Porte du Scex (inflow): reading rose by +79.5 m³/s

3 hours ago

↑Rhône, Genève (outflow): reading rose by +111.4 m³/s

6 hours ago

↑Arve, Genève (inflow): reading rose by +0.05 m a.s.l.

7 hours ago

↑Rhône, Porte du Scex (inflow): reading rose by +0.41 m a.s.l.

9 hours ago

↑Rhône, Brig (inflow): reading rose by +0.08 m a.s.l.

9 hours ago

↑Vispa, Visp (inflow): reading rose by +0.07 m a.s.l.

Stations

26 monitoring stations

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Webcams at Lake Geneva

Drag the timeline to compare the daily archive images.

Genfersee

Archive imageSep 21, 2026, 4:00 PM

Time travelSep 21, 2026, 4:00 PM

09/11Latest image

View original webcam

Understanding the water level

What is the water level of Lake Geneva? See the latest available level, its measurement time and source. Compare readings from the same station to understand the trend.

Reading in context

Putting Lake Geneva's current level in context

The main station at Arve, Genève (inflow) reports a water level of 378.97 m a.s.l. at Sep 21, 2026, 9:50 PM. The series is provided by Bundesamt für Umwelt (BAFU). This value is the elevation of the water surface above the official height datum, not the water depth at the shore.

Comparison with the nearest valid readings gives +4 cm over 24 hours and -12 cm over seven days. These are net changes between two points in time; they prove neither a continuous rise or fall nor its cause.

Understanding Lake Geneva

Lake Geneva is Switzerland's largest lake.

This overview includes 26 monitoring stations for water level, discharge, and water temperature. Not every station provides every measurement. Track changes at the same station, checking the timestamp, unit and source notes.

The curve shows recent level changes. A seasonal median, where available, compares the same time of year. Water can rise while remaining below that median: trend and comparison answer different questions. Neither replaces an official warning.

Measurement quality and sources

Data status

Measured — Recorded directly at a monitoring station.
Modelled — Computed by a scientific model (e.g. lake temperature from Alplakes), not measured on site.
Calculated — Derived from existing measurements, e.g. a balance or a change.
Archive image — Last archived image, not live.

Embed codeTag fjGsByGeYou can adjust the width and height if needed.

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