St. Marys River water temperature
St. Marys River, Garden River · River
The current water temperature at St. Marys River is 17.3 °C (as of September 20, 2026, source: Water Survey of Canada).
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 377 data points since September 1, 2026.
Lowest recorded value: 17.1 °C on September 16, 2026 · highest value: 20.3 °C on September 9, 2026.
In September, temperatures have ranged between 17.1 °C and 20.3 °C.
The current value is 1.6 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at St. Marys River right now?
The current water temperature is 17.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at St. Marys River?
Currently 17.3 °C (updated continuously).
How warm is at St. Marys River in September?
In September, the water temperature recently averaged 18.9 °C.
