St. Clair River water temperature
St. Clair River, Port Lambton (ECCC) · River
The current water temperature at St. Clair River is 20.6 °C (as of September 18, 2026, source: GLOS).
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 160 data points since August 24, 2026.
Lowest recorded value: 20.6 °C on September 18, 2026 · highest value: 22.2 °C on September 3, 2026.
In September, temperatures have ranged between 20.6 °C and 22.2 °C.
The current value is 1.1 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at St. Clair River right now?
The current water temperature is 20.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at St. Clair River?
Currently 20.6 °C (updated continuously).
How warm is at St. Clair River in September?
In September, the water temperature recently averaged 21.7 °C.
