Lamar River water temperature
Lamar River, Tower Ranger Station Ynp · River
The current water temperature at Lamar River is 11.8 °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 160 data points since July 23, 2026.
Lowest recorded value: 10.4 °C on September 9, 2026 · highest value: 20.1 °C on July 25, 2026.
In September, temperatures have ranged between 10.4 °C and 17.0 °C.
The current value is 1.9 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Lamar River right now?
The current water temperature is 11.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lamar River?
Currently 11.8 °C (updated continuously).
How warm is at Lamar River in September?
In September, the water temperature recently averaged 13.7 °C.
When is the water warmest at Lamar River?
Across the measurement record, July is on average the warmest month (19.1 °C).
