S F Flathead River water temperature
S F Flathead River, Twin C near Hungry Horse, Montana · River
The current water temperature at S F Flathead River is 11.5 °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 230 data points since July 23, 2026.
Lowest recorded value: 10.3 °C on September 15, 2026 · highest value: 19.5 °C on July 24, 2026.
In September, temperatures have ranged between 10.3 °C and 16.5 °C.
The current value is 1.6 °C below the September average of this series.
Nearby waters
More measuring points: S F Flathead River
Frequently asked questions
Can you swim at S F Flathead River right now?
The current water temperature is 11.5 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at S F Flathead River?
Currently 11.5 °C (updated continuously).
How warm is at S F Flathead River in September?
In September, the water temperature recently averaged 13.1 °C.
When is the water warmest at S F Flathead River?
Across the measurement record, July is on average the warmest month (17.0 °C).
