Rio Grande near Mercedes, Texas water temperature
Rio Grande near Mercedes, Texas · River
The current water temperature at Rio Grande near Mercedes is 31.1 °C (as of September 1, 2026, source: USGS).
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.
Measurement series & statistics
This measurement series includes 140 data points since July 8, 2026.
Lowest recorded value: 29.7 °C on July 11, 2026 · highest value: 32.7 °C on August 1, 2026.
In September, temperatures have ranged between 31.1 °C and 31.9 °C.
The current value is 0.4 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Rio Grande near Mercedes right now?
The current water temperature is 31.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Rio Grande near Mercedes?
Currently 31.1 °C (updated continuously).
How warm is at Rio Grande near Mercedes in September?
In September, the water temperature recently averaged 31.5 °C.
When is the water warmest at Rio Grande near Mercedes?
Across the measurement record, September is on average the warmest month (31.5 °C).
