San Joaquin River water temperature
San Joaquin River, Vernalis, California · River
The current water temperature at San Joaquin River is 22.1 °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.
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Measurement series & statistics
This measurement series includes 95 data points since July 28, 2026.
Lowest recorded value: 22.0 °C on September 2, 2026 · highest value: 28.7 °C on August 11, 2026.
In September, temperatures have ranged between 22.0 °C and 26.7 °C.
The current value is 1.6 °C below the September average of this series.
Nearby waters
More measuring points: San Joaquin River
Frequently asked questions
Can you swim at San Joaquin River right now?
The current water temperature is 22.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at San Joaquin River?
Currently 22.1 °C (updated continuously).
How warm is at San Joaquin River in September?
In September, the water temperature recently averaged 23.7 °C.
