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Ontario Weather

Ontario's climate is considered continental. Due to Ontario's size and diverse geography, temperatures may vary tremendously from region to region and even within the regions themselves.

Temperatures are given officially in degrees Celsius (C) with the Fahrenheit equivalent (F) often added. To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9, divide that total by 5, and then add 32. The Weather Network provides current Ontario weather updates and local forecasts.


March to May - The average spring temperature ranges from 8°C to 18°C (46°F to 64°F).


June to mid-September - Temperatures range from 21°C to 31°C (70°F to 88°F).


Mid-September to November - Temperatures range from 7°C to 17°C (45°F to 63°F).


December to February - Temperatures hover between -4C to -18C (25°F to 0°F). Snowfall usually occurs through December, January and February. Precipitation in Northern Ontario varies from 70 cm to 97 cm (28 in. to 38 in.). In Southwestern Ontario, it averages about 95 cm (37 in.) per year.