St Marys, in Ontario, Canada, is home to roughly 7,400 people in the Eastern Time Zone at 43.3°N latitude.
Recent weather here gives a sense of typical conditions: in 2025, St Marys recorded a mean annual temperature of 46°F, ranging from -10°F lows in January to 90°F highs in June, with about 38 inches of precipitation across the year.
View historical weather for St Marys · More cities in Ontario