Altenau water temperature
Altenau, Nordborchen · River
The current water temperature at Altenau is 10.8 °C (as of September 20, 2026, source: LANUV NRW).
A river can change temperature within hours — snowmelt, rain or power-plant operations show up immediately. That is why the measured value counts here, not an estimate.
.jpg){kind=link}
Measurement series & statistics
This measurement series includes 468 data points since July 22, 2026.
Lowest recorded value: 10.3 °C on August 24, 2026 · highest value: 12.6 °C on July 26, 2026.
In September, temperatures have ranged between 10.3 °C and 12.1 °C.
The current value is 0.4 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Altenau right now?
The current water temperature is 10.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Altenau?
Currently 10.8 °C (updated continuously).
How warm is at Altenau in September?
In September, the water temperature recently averaged 11.2 °C.
When is the water warmest at Altenau?
Across the measurement record, August is on average the warmest month (11.4 °C).
