Severe Weather Alerts - St. Marys, Ontario

  • Special Weather Statement

    Special Weather Statement in effect until Saturday, 3:18 AM EDT. Source: Environment Canada

A warm and humid airmass is settling into southern Ontario. While heat warning criteria is not expected to be reached in most places, this is the first very warm and humid weather of the season.

These conditions pose a health risk when you are not used to the heat. Everyone is at risk from heat, especially older adults, infants and young children, and people with chronic illnesses. You are advised to (1) drink plenty of cool liquids before feeling thirsty, and (2) keep cool by dressing for the weather and spending a few hours each day in a cool place.

Maximum temperatures will range from 28 to 30 across the regions today and from 29 to 32 Saturday. Overnight lows will range from 17 to 20 tonight and from 18 to 21 Saturday night.

Maximum temperatures Sunday and Monday are forecast to be in the high twenties with overnight lows in the mid to high teens.

Please monitor the latest forecasts and warning from Environment Canada at

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports to #ONStorm.