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Lake BrenetsWater level today

743.42m a.s.l.

0 cm since yesterday

Measurement disrupted

Due to the extremely low water level of Lac des Brenets, the level measuring installations can no longer provide reliable data.

View the Federal Office for the Environment’s notice
Measured26 minutes ago

Lac des Brenets, Les Brenets · Bundesamt für Umwelt (BAFU)

Change across the visible readings

0 cm

09/22 – 09/23

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Year comparison →Temperature profile →
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Year comparison & records

View details →
  • Current year 2026
  • Previous year 2025
  • Median
  • 25th-75th percentile
  • Maximum / minimum

How to read the chart: the thick line is the current year, the thin one the median of the 1991-2020 reference period. The shaded band shows the normal range (25th–75th percentile), the dotted lines the maximum and minimum. Values above the band are unusually high for the season, below unusually low – but not an official warning.

Today at the lake

The current picture

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

Water temperature

17.7 °C

Rather cool

Modelled

Wind

1.8 km/h

Calm

Measured

Precipitation, 24h

0.0 mm

Dry

Measured

Weather at the lake

8.5°Air temperature
0.0mmRain, last 24 h
1.8km/hWind
8.5–8.5°Day range

0.0 mm in 48 h · 0.0 mm over 7 days · Gusts 4.7 km/h · 69 % humidity

Source: MeteoSwiss, station La Chaux-de-Fonds · 2 hours ago

UV index

Low
0Daily maximum 4
Course of the day
69121518

No protection needed.

Source: Open-Meteo

Recent events

16 hours ago

Modelled lake temperature (1 m depth): new weekly low (17.4 °C)

19 hours ago

Modelled lake temperature (1 m depth): new weekly low (17.5 °C)

22 hours ago

Modelled lake temperature (1 m depth): new weekly low (17.7 °C)

2 days ago

Modelled lake temperature (1 m depth): new weekly low (17.8 °C)

2 days ago

Modelled lake temperature (1 m depth): new weekly low (17.9 °C)

2 days ago

Modelled lake temperature (1 m depth): new weekly low (18.1 °C)

Stations

2 monitoring stations
Show monitoring stations
Modelled lake temperature (1 m depth) · CH17.7 °C2 hours ago↓Lac des Brenets, Les Brenets · CH743.42 m a.s.l.26 minutes ago→

Webcams at Lake Brenets

Drag the timeline to compare the daily archive images.

Le Locle › Nordwest: Doubs / Lac des Brenets

Le Locle › Nordwest: Doubs / Lac des Brenets

Archive imageSep 23, 2026, 4:00 PM
Time travelSep 23, 2026, 4:00 PM
09/13Latest image
View original webcam

Understanding the water level

What is the water level of Lake Brenets? 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 Brenets's current level in context

The main station at Lac des Brenets, Les Brenets reports a water level of 743.42 m a.s.l. at Sep 24, 2026, 1:10 AM. 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.

The median for the same calendar day is 750.12 m a.s.l.; the current value is 670 cm below it. The 748.86–750.70 m a.s.l. band contains the middle 50 percent of reference values from 1991-2020. Being outside it is less usual, but is not in itself a hazard level.

Comparison with the nearest valid readings gives 0 cm over 24 hours and 0 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 Brenets

Lac des Brenets is a reservoir section of the Doubs on the Swiss–French border.

This overview includes 2 monitoring stations for water level 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.
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