Sun River at Simms, Montana water temperature
Sun River at Simms, Montana · River
The current water temperature at Sun River at Simms is 16.7 °C (as of September 1, 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 226 data points since July 3, 2026.
Lowest recorded value: 12.5 °C on August 31, 2026 · highest value: 26.3 °C on July 25, 2026.
In September, temperatures have ranged between 16.7 °C and 19.2 °C.
The current value is 1.1 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Sun River at Simms right now?
The current water temperature is 16.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Sun River at Simms?
Currently 16.7 °C (updated continuously).
How warm is at Sun River at Simms in September?
In September, the water temperature recently averaged 17.8 °C.
When is the water warmest at Sun River at Simms?
Across the measurement record, July is on average the warmest month (21.9 °C).
