Yellowstone River water temperature
Yellowstone River, Sidney, Montana · River
The current water temperature at Yellowstone River is 17.2 °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 143 data points since July 23, 2026.
Lowest recorded value: 16.3 °C on September 15, 2026 · highest value: 27.1 °C on July 26, 2026.
In September, temperatures have ranged between 16.3 °C and 25.1 °C.
The current value is 4.3 °C below the September average of this series.
Nearby waters
More measuring points: Yellowstone River
Frequently asked questions
Can you swim at Yellowstone River right now?
The current water temperature is 17.2 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Yellowstone River?
Currently 17.2 °C (updated continuously).
How warm is at Yellowstone River in September?
In September, the water temperature recently averaged 21.5 °C.
When is the water warmest at Yellowstone River?
Across the measurement record, July is on average the warmest month (26.0 °C).
