Merced River A Happy Isles Bridge water temperature
Merced River A Happy Isles Bridge, Yosemite, California · River
The current water temperature at Merced River A Happy Isles Bridge is 11.6 °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 152 data points since July 23, 2026.
Lowest recorded value: 11.3 °C on September 3, 2026 · highest value: 19.2 °C on July 24, 2026.
In September, temperatures have ranged between 11.3 °C and 14.8 °C.
The current value is 1.3 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Merced River A Happy Isles Bridge right now?
The current water temperature is 11.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Merced River A Happy Isles Bridge?
Currently 11.6 °C (updated continuously).
How warm is at Merced River A Happy Isles Bridge in September?
In September, the water temperature recently averaged 12.9 °C.
When is the water warmest at Merced River A Happy Isles Bridge?
Across the measurement record, July is on average the warmest month (16.3 °C).
