San Joaquin River water temperature
San Joaquin River, Merced River near Newman, California · River
The current water temperature at San Joaquin River is 20.6 °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 212 data points since July 23, 2026.
Lowest recorded value: 19.8 °C on September 7, 2026 · highest value: 29.9 °C on August 10, 2026.
In September, temperatures have ranged between 19.8 °C and 26.8 °C.
The current value is 2.5 °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 20.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at San Joaquin River?
Currently 20.6 °C (updated continuously).
How warm is at San Joaquin River in September?
In September, the water temperature recently averaged 23.1 °C.
When is the water warmest at San Joaquin River?
Across the measurement record, July is on average the warmest month (25.7 °C).
