Lake Ontario, Oswego, NY (274) · Lake
The current water temperature at Lake Ontario is 23.8 °C (as of July 17, 2026, source: NOAA NDBC).
Can you swim at Lake Ontario right now?
The current water temperature is 23.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lake Ontario?
Currently 23.8 °C (updated continuously).
How warm is at Lake Ontario in July?
In July, the water temperature recently averaged 22.0 °C.