Big Walnut Creek water temperature
Big Walnut Creek, Sunbury, Ohio · River
The current water temperature at Big Walnut Creek is 20.1 °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 134 data points since July 23, 2026.
Lowest recorded value: 19.9 °C on August 24, 2026 · highest value: 27.9 °C on September 3, 2026.
In September, temperatures have ranged between 19.9 °C and 27.9 °C.
The current value is 3.4 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Big Walnut Creek right now?
The current water temperature is 20.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Big Walnut Creek?
Currently 20.1 °C (updated continuously).
How warm is at Big Walnut Creek in September?
In September, the water temperature recently averaged 23.5 °C.
When is the water warmest at Big Walnut Creek?
Across the measurement record, September is on average the warmest month (23.5 °C).
