Hallstätter See water temperature
Hallstätter See, Lahn · Lake
The current water temperature at Hallstätter See is 16.6 °C (as of September 20, 2026, source: Hydrographie Land Oberösterreich).
Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.
Water quality
EU classification: excellentMeasurement series & statistics
This measurement series includes 808 data points since July 22, 2026.
Lowest recorded value: 16.3 °C on September 20, 2026 · highest value: 24.4 °C on August 14, 2026.
In September, temperatures have ranged between 16.3 °C and 21.7 °C.
The current value is 2.4 °C below the September average of this series.
Nearby waters
More measuring points: Hallstätter See
Frequently asked questions
Can you swim at Hallstätter See right now?
The current water temperature is 16.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Hallstätter See?
Currently 16.6 °C (updated continuously).
How warm is at Hallstätter See in September?
In September, the water temperature recently averaged 19.0 °C.
When is the water warmest at Hallstätter See?
Across the measurement record, August is on average the warmest month (21.4 °C).
How is the water quality at Hallstätter See?
The official classification is: excellent.
