St. Marys River water temperature
St. Marys River, Garden River · River
The current water temperature at St. Marys River is 20.2 °C (as of September 6, 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.
20.2 °C
Nearby waters
Frequently asked questions
Can you swim at St. Marys River right now?
The current water temperature is 20.2 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at St. Marys River?
Currently 20.2 °C (updated continuously).
