Difficult Run water temperature
Difficult Run, Fox Lake near Fairfax, Virginia · River
The current water temperature at Difficult Run is 21.1 °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 85 data points since August 27, 2026.
Lowest recorded value: 19.8 °C on September 8, 2026 · highest value: 25.7 °C on September 4, 2026.
In September, temperatures have ranged between 19.8 °C and 25.7 °C.
The current value is 1.7 °C below the September average of this series.
Nearby waters
More measuring points: Difficult Run
Frequently asked questions
Can you swim at Difficult Run right now?
The current water temperature is 21.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Difficult Run?
Currently 21.1 °C (updated continuously).
How warm is at Difficult Run in September?
In September, the water temperature recently averaged 22.8 °C.
