Seepegel
Lake Brienz

Temperature profile in Lake Brienz

How modelled water temperature changes from the surface to the lake bed. The profile makes the thermocline and cold deep water visible.

0 m65 m130 m194 m259 m16.5 °C°C →

How to read: the vertical axis is water depth (surface at the top, deeper going down), the horizontal axis is temperature. In summer the water is warm at the surface and colder with depth; the zone where the temperature drops quickly is the thermocline. Values come from the Alplakes (Eawag) lake model and are modelled, not measured on site.

Model: Alplakes / Eawag, Simstrat · 2 hours ago · not a local bathing-site measurement

Current model profile

Thermal layers in Lake Brienz

Surface

16.5 °C

Model layer at 0.00 m

Deep model layer

6.2 °C

Model layer at 259.00 m

Vertical difference

10.2 °C

Surface versus deepest layer

In the current profile, Lake Brienz's surface is 16.5 °C, 10.2 °C warmer than the deepest displayed model layer at 259.00 m (6.2 °C). The profile therefore shows a clear decrease in temperature with depth.

Across 260 calculated depth layers, the modelled temperature ranges from 6.2 °C to 16.5 °C. The full curve shows where the largest transition occurs; surface and deep values alone would not describe that layering.

The depth is the deepest layer returned by the Simstrat model, not a newly surveyed maximum depth of the lake. The profile describes a modelled lake state, not the temperature at a particular bathing site.

Compared with previous years

Water temperature through the year, alongside the median and usual range from the 1981–2025 reference period. Modelled values at 1 m depth (Simstrat, Eawag).

  • 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 1981–2025 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.

Air and water compared

Both curves on the same axis. The lake follows the air by weeks, barely varies from day to day and cools far more slowly in autumn.