Boundary Reservoir water temperature
Boundary Reservoir, Forebay near Metaline Falls · Lake
The current water temperature at Boundary Reservoir is 17.8 °C (as of September 21, 2026, source: USGS).
Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.
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Measurement series & statistics
This measurement series includes 430 data points since July 23, 2026.
Lowest recorded value: 17.8 °C on September 21, 2026 · highest value: 24.3 °C on July 30, 2026.
In September, temperatures have ranged between 17.8 °C and 22.4 °C.
The current value is 2.9 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Boundary Reservoir right now?
The current water temperature is 17.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Boundary Reservoir?
Currently 17.8 °C (updated continuously).
How warm is at Boundary Reservoir in September?
In September, the water temperature recently averaged 20.7 °C.
When is the water warmest at Boundary Reservoir?
Across the measurement record, July is on average the warmest month (23.5 °C).
