Illinois River water temperature
Illinois River, Henry, Illinois · River
The current water temperature at Illinois River is 14.4 °C (as of November 6, 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 488 data points since September 7, 2026.
Lowest recorded value: 14.4 °C on November 6, 2026 · highest value: 29.5 °C on September 7, 2026.
In November, temperatures have ranged between 14.4 °C and 16.9 °C.
The current value is 1.4 °C below the November average of this series.
Nearby waters
More measuring points: Illinois River
Frequently asked questions
Can you swim at Illinois River right now?
The current water temperature is 14.4 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Illinois River?
Currently 14.4 °C (updated continuously).
How warm is at Illinois River in November?
In November, the water temperature recently averaged 15.8 °C.
When is the water warmest at Illinois River?
Across the measurement record, September is on average the warmest month (23.4 °C).
