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Lake SarnenWater level today

469.08m a.s.l.

+1 cm since yesterday

Measured12 minutes ago

Sarnersee, Sarnen · Bundesamt für Umwelt (BAFU)

Change across the visible readings

0 cm

09/23 – 09/24

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View water balance →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

19.8 °C

Pleasant

Modelled

Wind

3.2 km/h

Calm

Measured

Precipitation, 24h

0.0 mm

Dry

Measured

What's happening?

The level has been falling for a week.

-0.03 m ü. M. · over 7 days

Weather at the lake

7.8°Air temperature
0.0mmRain, last 24 h
3.2km/hWind
7.8–10.1°Day range

0.0 mm in 48 h · 0.0 mm over 7 days · Gusts 8.3 km/h · 98 % humidity

Source: MeteoSwiss, station Giswil · 1 hour ago

UV index

Moderate
3Daily maximum 3
Course of the day
9121518

Seek shade around midday; sunscreen and sunglasses.

Source: Open-Meteo

Recent events

2 hours ago

Modelled lake temperature (1 m depth): new weekly low (19.8 °C)

5 hours ago

Modelled lake temperature (1 m depth): new weekly low (19.9 °C)

yesterday

Modelled lake temperature (1 m depth): new weekly low (19.9 °C)

yesterday

Modelled lake temperature (1 m depth): new weekly low (20.0 °C)

2 days ago

Modelled lake temperature (1 m depth): new weekly low (20.1 °C)

2 days ago

Modelled lake temperature (1 m depth): new weekly low (20.2 °C)

Stations

4 monitoring stations
Show monitoring stations
Modelled lake temperature (1 m depth) · CH19.8 °C2 hours ago↓Sarnersee, Sarnen · CH469.08 m a.s.l.12 minutes ago→Sarner Aa, Sarnen (outflow) · CH2.8 m³/s12 minutes ago→Sarner Aa, Sarnen (outflow) · CH468.45 m a.s.l.12 minutes ago→

Webcams at Lake Sarnen

Drag the timeline to compare the daily archive images.

Sachseln › Südwest: Sarnersee

Sachseln › Südwest: Sarnersee

Archive imageSep 24, 2026, 11:00 AM
Time travelSep 24, 2026, 11:00 AM
09/14Latest image
View original webcam

Understanding the water level

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

The main station at Sarnersee, Sarnen reports a water level of 469.08 m a.s.l. at Sep 24, 2026, 10:50 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 469.36 m a.s.l.; the current value is 28 cm below it. The 469.28–469.51 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 +1 cm over 24 hours and -3 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 Sarnen

Lake Sarnen lies in Obwalden's main valley between Sarnen and Giswil.

This overview includes 4 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.
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