Willamette River water temperature
Willamette River, Harrisburg, Oregon · River
The current water temperature at Willamette 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 428 data points since July 23, 2026.
Lowest recorded value: 15.5 °C on September 4, 2026 · highest value: 21.8 °C on July 24, 2026.
In September, temperatures have ranged between 15.5 °C and 19.4 °C.
Nearby waters
More measuring points: Willamette River
Frequently asked questions
Can you swim at Willamette 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 Willamette River?
Currently 17.1 °C (updated continuously).
How warm is at Willamette River in September?
In September, the water temperature recently averaged 17.1 °C.
When is the water warmest at Willamette River?
Across the measurement record, July is on average the warmest month (20.0 °C).
