Yellowstone River near Sidney, Montana water temperature
Yellowstone River near Sidney, Montana · River
The current water temperature at Yellowstone River near Sidney is 21.8 °C (as of September 2, 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 92 data points since July 5, 2026.
Lowest recorded value: 19.5 °C on September 1, 2026 · highest value: 27.7 °C on July 12, 2026.
In September, temperatures have ranged between 19.5 °C and 21.8 °C.
The current value is 1.2 °C above the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Yellowstone River near Sidney right now?
The current water temperature is 21.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Yellowstone River near Sidney?
Currently 21.8 °C (updated continuously).
How warm is at Yellowstone River near Sidney in September?
In September, the water temperature recently averaged 20.6 °C.
When is the water warmest at Yellowstone River near Sidney?
Across the measurement record, July is on average the warmest month (26.0 °C).
