Rhein water temperature
Rhein, Mainz-Wiesbaden · River
The current water temperature at Rhein is 20.6 °C (as of September 20, 2026, source: LfU Rheinland-Pfalz (GUS)).
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.
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Measurement series & statistics
This measurement series includes 357 data points since July 22, 2026.
Lowest recorded value: 20.5 °C on September 20, 2026 · highest value: 27.5 °C on August 5, 2026.
In September, temperatures have ranged between 20.5 °C and 23.6 °C.
The current value is 1.7 °C below the September average of this series.
Nearby waters
More measuring points: Rhein
Frequently asked questions
Can you swim at Rhein right now?
The current water temperature is 20.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Rhein?
Currently 20.6 °C (updated continuously).
How warm is at Rhein in September?
In September, the water temperature recently averaged 22.3 °C.
When is the water warmest at Rhein?
Across the measurement record, July is on average the warmest month (24.6 °C).
