Weather Forecast and Radar for St. Marys, Ontario

Weather in St. Marys, ON

St. Marys, Ontario is located in southwestern Ontario and experiences four distinct seasons.

In the winter months (December-February), temperatures typically range from -5 to -15 degrees Celsius at night, and between -2 and 2 degrees Celsius during the day. Snowfall is common during this time of year, with an average of about 65 centimeters of snow per month.

In the spring (March-May), temperatures range from 4 to 14 degrees Celsius at night and 10 to 20 degrees Celsius during the day. Precipitation is common in the spring, with the average monthly rainfall being about 55 millimeters.

In the summer (June-August), temperatures range from 15 to 25 degrees Celsius at night and 21 to 30 degrees Celsius during the day. Monthly rainfall averages around 65 millimeters.

In the fall (September-November), temperatures range from 3 to 10 degrees Celsius at night and 9 to 16 degrees Celsius during the day. The average monthly rainfall is around 75 millimeters.

Fast Facts About St. Marys, ON

As of 2020, the city population is 7265.

Major Cities Nearby St. Marys, ON

This map shows the current & 7-day weather forecast, weather alerts, and weather radar for St. Marys, Ontario.