Tuolumne River A Grand Cyn of Tuolumne water temperature
Tuolumne River A Grand Cyn of Tuolumne, Hetch Hetchy · River
The current water temperature at Tuolumne River A Grand Cyn of Tuolumne is 15.8 °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 284 data points since July 23, 2026.
Lowest recorded value: 15.3 °C on September 3, 2026 · highest value: 23.8 °C on August 10, 2026.
In September, temperatures have ranged between 15.3 °C and 20.4 °C.
The current value is 1.4 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Tuolumne River A Grand Cyn of Tuolumne right now?
The current water temperature is 15.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Tuolumne River A Grand Cyn of Tuolumne?
Currently 15.8 °C (updated continuously).
How warm is at Tuolumne River A Grand Cyn of Tuolumne in September?
In September, the water temperature recently averaged 17.2 °C.
When is the water warmest at Tuolumne River A Grand Cyn of Tuolumne?
Across the measurement record, August is on average the warmest month (20.6 °C).
