
Severe thunderstorms and heavy rain threaten Ontario Wednesday
Widespread thunderstorms, including some severe, are expected across Ontario on Wednesday. Localized flooding presents the most significant hazard as atmospheric moisture levels are forecast between 40-60 mm, highlighting a heightened flood risk. Gusty winds of 80+ km/h are also possible in organized thunderstorm activity. Visit our Complete Guide to Fall 2026 for an in depth look at the Fall Forecast, tips to plan for it and much more! Be sure to stay alert to the changing conditions, and check for any weather warnings in your area. Severe thunderstorm risk in Ontario Wednesday with localized flooding a top concernA low pressure system from the Prairies is moving through Ontario, bringing a surge of muggy air across the province. Temperatures will reach the mid-20s, feeling close to 30°C in parts of southern Ontario, including the Greater Toronto Area (GTA). DON'T MISS: Meteor shower season is about to begin! Thunderstorms, some severe, are expected Wednesday as moisture and instability peak ahead of a cold front. Rain and storms will develop across cottage country and Muskoka before spreading southward. Areas near Parry Sound could see 20-30+ mm of rainfall.
















