American River water temperature
American River, Folsom Dam near Folsom, California · River
The current water temperature at American River is 17.4 °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 175 data points since July 24, 2026.
Lowest recorded value: 14.5 °C on August 3, 2026 · highest value: 19.3 °C on July 31, 2026.
In September, temperatures have ranged between 16.3 °C and 19.1 °C.
The current value is 1.0 °C below the September average of this series.
Nearby waters
More measuring points: American River
Frequently asked questions
Can you swim at American River right now?
The current water temperature is 17.4 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at American River?
Currently 17.4 °C (updated continuously).
How warm is at American River in September?
In September, the water temperature recently averaged 18.4 °C.
When is the water warmest at American River?
Across the measurement record, July is on average the warmest month (18.4 °C).
