St. Clair River water temperature
St. Clair River, Port Lambton (ECCC) · River
The current water temperature at St. Clair River is 17.4 °C (as of October 10, 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 851 data points since August 27, 2026.
Lowest recorded value: 17.4 °C on October 7, 2026 · highest value: 22.2 °C on September 3, 2026.
In October, temperatures have ranged between 17.4 °C and 18.6 °C.
The current value is 0.7 °C below the October average of this series.
Nearby waters
Frequently asked questions
Can you swim at St. Clair River right now?
The current water temperature is 17.4 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at St. Clair River?
Currently 17.4 °C (updated continuously).
How warm is at St. Clair River in October?
In October, the water temperature recently averaged 18.1 °C.
When is the water warmest at St. Clair River?
Across the measurement record, August is on average the warmest month (21.6 °C).
