Potomac River water temperature
Potomac River, Point of Rocks, Maryland · River
The current water temperature at Potomac River is 24.5 °C (as of September 21, 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 153 data points since July 23, 2026.
Lowest recorded value: 23.8 °C on August 28, 2026 · highest value: 29.5 °C on August 9, 2026.
In September, temperatures have ranged between 24.0 °C and 28.8 °C.
The current value is 2.1 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Potomac River right now?
The current water temperature is 24.5 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Potomac River?
Currently 24.5 °C (updated continuously).
How warm is at Potomac River in September?
In September, the water temperature recently averaged 26.6 °C.
When is the water warmest at Potomac River?
Across the measurement record, July is on average the warmest month (27.0 °C).
