South Fork Sultan River water temperature
South Fork Sultan River, Sultan, Washington · River
The current water temperature at South Fork Sultan River is 10.1 °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 223 data points since July 23, 2026.
Lowest recorded value: 9.9 °C on September 8, 2026 · highest value: 16.1 °C on July 24, 2026.
In September, temperatures have ranged between 9.9 °C and 13.0 °C.
The current value is 1.3 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at South Fork Sultan River right now?
The current water temperature is 10.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at South Fork Sultan River?
Currently 10.1 °C (updated continuously).
How warm is at South Fork Sultan River in September?
In September, the water temperature recently averaged 11.4 °C.
When is the water warmest at South Fork Sultan River?
Across the measurement record, July is on average the warmest month (13.5 °C).
