Firehole River water temperature
Firehole River, West Yellowstone, Montana · River
The current water temperature at Firehole River is 17.1 °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 159 data points since July 23, 2026.
Lowest recorded value: 15.0 °C on September 8, 2026 · highest value: 26.3 °C on July 23, 2026.
In September, temperatures have ranged between 15.0 °C and 23.6 °C.
The current value is 2.5 °C below the September average of this series.
Nearby waters
More measuring points: Firehole River
Frequently asked questions
Can you swim at Firehole River right now?
The current water temperature is 17.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Firehole River?
Currently 17.1 °C (updated continuously).
How warm is at Firehole River in September?
In September, the water temperature recently averaged 19.6 °C.
When is the water warmest at Firehole River?
Across the measurement record, July is on average the warmest month (25.2 °C).
