Siuslaw River water temperature
Siuslaw River, Mapleton, Oregon · River
The current water temperature at Siuslaw River is 18.3 °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 139 data points since July 23, 2026.
Lowest recorded value: 15.1 °C on September 5, 2026 · highest value: 24.1 °C on August 8, 2026.
In September, temperatures have ranged between 15.1 °C and 23.0 °C.
The current value is 0.4 °C above the September average of this series.
Nearby waters
More measuring points: Siuslaw River
Frequently asked questions
Can you swim at Siuslaw River right now?
The current water temperature is 18.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Siuslaw River?
Currently 18.3 °C (updated continuously).
How warm is at Siuslaw River in September?
In September, the water temperature recently averaged 17.9 °C.
When is the water warmest at Siuslaw River?
Across the measurement record, July is on average the warmest month (22.4 °C).
