Columbia River at the Dalles Dam Forebay, Washington water temperature
Columbia River at the Dalles Dam Forebay, Washington · River
The current water temperature at Columbia River at the Dalles Dam Forebay is 20.5 °C (as of September 8, 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 145 data points since July 22, 2026.
Lowest recorded value: 20.5 °C on September 8, 2026 · highest value: 22.5 °C on August 21, 2026.
In September, temperatures have ranged between 20.5 °C and 21.5 °C.
The current value is 0.6 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Columbia River at the Dalles Dam Forebay right now?
The current water temperature is 20.5 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Columbia River at the Dalles Dam Forebay?
Currently 20.5 °C (updated continuously).
How warm is at Columbia River at the Dalles Dam Forebay in September?
In September, the water temperature recently averaged 21.1 °C.
When is the water warmest at Columbia River at the Dalles Dam Forebay?
Across the measurement record, July is on average the warmest month (21.8 °C).
