Hallstättersee, Untersee water temperature

Hallstättersee, Untersee, Bad Goisern · Lake

The current water temperature at Hallstättersee is 21.6 °C (as of August 17, 2026, source: AGES).

Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.

21.6 °C

Measured: August 17, 2026 · continuously updated

💧 Water 21.6° · ☀️ Air 10.9° · high today 18.8°

Temperature trend of recent weeks

Hallstättersee, Untersee — Photo: Hangman'sDeath · CC0 · Wikimedia Commons

Water quality

EU classification: excellent · Visibility depth: 5.0 m

Nearby waters

Hallstätter See, Steeg · 1.0 km away15.5 °C Traun, Steeg (Seeausfluss) · 1.4 km away19.3 °C Hallstättersee, Obertraun, Obertraun · 5.8 km away21.7 °C Hallstättersee, Hallstatt, Hallstatt · 6.0 km away21.3 °C Hallstätter See, Lahn · 6.2 km away19.2 °C

Frequently asked questions

Can you swim at Hallstättersee right now?
The current water temperature is 21.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Hallstättersee?
Currently 21.6 °C (updated continuously).

How is the water quality at Hallstättersee?
The official classification is: excellent.

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