Alster water temperature
Alster · Lake
The current water temperature at Alster is 17.0 °C (as of September 20, 2026, source: Badegewässer Hamburg (BUE/BUKEA)).
Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.
Measurement series & statistics
This measurement series includes 139 data points since July 22, 2026.
Lowest recorded value: 17.0 °C on September 20, 2026 · highest value: 24.0 °C on August 6, 2026.
In September, temperatures have ranged between 17.0 °C and 19.5 °C.
The current value is 1.3 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Alster right now?
The current water temperature is 17.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Alster?
Currently 17.0 °C (updated continuously).
How warm is at Alster in September?
In September, the water temperature recently averaged 18.3 °C.
When is the water warmest at Alster?
Across the measurement record, August is on average the warmest month (21.3 °C).
