Illinois River near Agness, Oregon water temperature
Illinois River near Agness, Oregon · River
The current water temperature at Illinois River near Agness is 18.8 °C (as of September 20, 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.
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Measurement series & statistics
This measurement series includes 175 data points since July 22, 2026.
Lowest recorded value: 16.8 °C on September 7, 2026 · highest value: 24.8 °C on July 26, 2026.
In September, temperatures have ranged between 16.8 °C and 21.7 °C.
The current value is 0.1 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Illinois River near Agness right now?
The current water temperature is 18.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Illinois River near Agness?
Currently 18.8 °C (updated continuously).
How warm is at Illinois River near Agness in September?
In September, the water temperature recently averaged 18.9 °C.
When is the water warmest at Illinois River near Agness?
Across the measurement record, July is on average the warmest month (23.5 °C).
