Columbia River at Bonneville Dam Forebay, Washington water temperature
Columbia River at Bonneville Dam Forebay, Washington · River
The current water temperature at Columbia River at Bonneville Dam Forebay is 21.1 °C (as of September 1, 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 122 data points since July 3, 2026.
Lowest recorded value: 18.7 °C on July 3, 2026 · highest value: 22.2 °C on August 25, 2026.
Nearby waters
Frequently asked questions
Can you swim at Columbia River at Bonneville Dam Forebay right now?
The current water temperature is 21.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Columbia River at Bonneville Dam Forebay?
Currently 21.1 °C (updated continuously).
How warm is at Columbia River at Bonneville Dam Forebay in September?
In September, the water temperature recently averaged 21.1 °C.
When is the water warmest at Columbia River at Bonneville Dam Forebay?
Across the measurement record, August is on average the warmest month (21.6 °C).
