Kootenai River water temperature
Kootenai River, Porthill, Idaho · River
The current water temperature at Kootenai River is 14.8 °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 421 data points since July 23, 2026.
Lowest recorded value: 13.6 °C on September 4, 2026 · highest value: 17.8 °C on July 23, 2026.
In September, temperatures have ranged between 13.6 °C and 15.6 °C.
The current value is 0.2 °C above the September average of this series.
Nearby waters
More measuring points: Kootenai River
Frequently asked questions
Can you swim at Kootenai River right now?
The current water temperature is 14.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Kootenai River?
Currently 14.8 °C (updated continuously).
How warm is at Kootenai River in September?
In September, the water temperature recently averaged 14.6 °C.
When is the water warmest at Kootenai River?
Across the measurement record, July is on average the warmest month (17.4 °C).
