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Lake ThunWater level today

547.87m a.s.l.

-8 cm since yesterday

Measured19 minutes ago

Aare, Thun (outflow) · Bundesamt für Umwelt (BAFU)

Change across the visible readings

-8 cm

09/20 – 09/21

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View water balance →Year comparison →Temperature profile →
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Forecast

Source: FOEN forecast

The forecast value is expected to fall by about 37 cm across the 6 displayed forecast days.

Today09/21547.86m a.s.l.
Tue09/22547.80m a.s.l.
Wed09/23547.69m a.s.l.
Thu09/24547.61m a.s.l.
Fri09/25547.55m a.s.l.
Sat09/26547.50m 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

19.6 °C

Pleasant

Modelled

Wind

10.8 km/h

Calm

Measured

Precipitation, 24h

0.0 mm

Dry

Measured

What's happening?

Measured outflows exceed inflows

-42.7 m³/s

The level has been falling for a week.

-0.36 m ü. M. · over 7 days

The level has been falling for 6 days — consistent with the dry weather of the past few days.

6 days in a row · 0.0 mm rain (48 h)

Weather at the lake

21.7°Air temperature
0.0mmRain, last 24 h
10.8km/hWind
8.1–22.1°Day range

0.0 mm in 48 h · 7.7 mm over 7 days · Gusts 24.5 km/h · 52 % humidity

Source: MeteoSwiss, station Thun · 1 hour ago

UV index

Low
0Daily maximum 5
Course of the day
912151821

No protection needed.

Source: Open-Meteo

Recent events

10 hours ago

Modelled lake temperature (1 m depth): new weekly low (19.4 °C)

10 hours ago

↓Aare, Thun (outflow): reading fell by -0.14 m a.s.l.

11 hours ago

↓Kander, Emdthal-Heustrich (inflow): reading fell by -3.4 m³/s

11 hours ago

↓Kander, Emdthal-Heustrich (inflow): reading fell by -0.08 m a.s.l.

14 hours ago

Aare, Thun (outflow): new weekly low (57.9 m³/s)

14 hours ago

Aare, Thun (outflow): new weekly low (547.87 m a.s.l.)

Stations

9 monitoring stations
Show monitoring stations
Aare, Thun (outflow) · CH57.9 m³/s19 minutes ago→Aare, Thun (outflow) · CH547.87 m a.s.l.19 minutes ago→Aare, Thun (temperature) · CH19.0 °C19 minutes ago↓Modelled lake temperature (1 m depth) · CH19.6 °C1 hour ago↓Kander, Emdthal-Heustrich (inflow) · CH13.2 m³/s1 hour ago↑Kander, Emdthal-Heustrich (inflow) · CH670.97 m a.s.l.1 hour ago→Simme, Latterbach (inflow) · CH2.0 m³/s19 minutes ago↓Simme, Latterbach (inflow) · CH664.37 m a.s.l.19 minutes ago↓Spiez · CH557.76 m a.s.l.19 minutes ago→

Webcams at Lake Thun

Drag the timeline to compare the daily archive images.

Spiez › East: Thunersee

Spiez › East: Thunersee

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 Thun? 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 Thun's current level in context

The main station at Aare, Thun (outflow) reports a water level of 547.87 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 -8 cm over 24 hours and -36 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 Thun

Lake Thun lies in the Bernese Oberland, framed by alpine peaks.

This overview includes 9 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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