Marias River water temperature
Marias River, Highway 223 bridge near Chester, Montana · River
The current water temperature at Marias River is 14.9 °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 316 data points since July 23, 2026.
Lowest recorded value: 12.3 °C on September 9, 2026 · highest value: 21.2 °C on July 25, 2026.
In September, temperatures have ranged between 12.3 °C and 18.2 °C.
The current value is 0.3 °C below the September average of this series.
Nearby waters
More measuring points: Marias River
Frequently asked questions
Can you swim at Marias River right now?
The current water temperature is 14.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Marias River?
Currently 14.9 °C (updated continuously).
How warm is at Marias River in September?
In September, the water temperature recently averaged 15.2 °C.
When is the water warmest at Marias River?
Across the measurement record, July is on average the warmest month (18.7 °C).
