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TORONTO, August 12, 2026 — Environment and Climate Change Canada has issued a Severe Thunderstorm Watch for Toronto this afternoon (August 12, 2026), with conditions favourable for storms capable of producing damaging winds, large hail and heavy rainfall this afternoon and into this evening.
The storms could produce wind gusts near 100 km/h, toonie-sized hail and rainfall amounts exceeding 60 millimetres.
The greatest rainfall totals are expected in areas that experience multiple thunderstorms as storm cells move through the region.
Strong winds and hail possible
The combination of strong winds and large toonie-sized hail could cause damage to trees, roofs and other property. Local power outages are also possible.
Residents are advised to secure loose objects around their homes, including patio furniture, garbage and recycling bins, umbrellas and other items that could be blown around by strong winds.
Heavy rainfall could also result in rapidly rising water and flash flooding, particularly in areas that receive repeated thunderstorms.
Environment Canada warns that fast-moving water can sweep vehicles away and damage roads and other infrastructure. Drivers should never attempt to drive through flooded roadways.
When thunder roars, go indoors
Environment Canada reminds residents that thunderstorms can produce dangerous lightning, even when the storm does not appear particularly severe.
When thunder roars, go indoors.
Emergency Management Ontario recommends taking cover immediately if threatening weather approaches and remaining indoors until the storm has passed.
A Severe Thunderstorm Watch means conditions are favourable for the development of thunderstorms capable of producing damaging hail, strong winds or heavy rainfall. A watch is not a warning that severe weather is occurring at that moment, but conditions can change quickly.
The Severe Thunderstorm Watch is in effect for Toronto from this afternoon into this evening.
Toronto residents should continue monitoring Environment Canada alerts and forecasts throughout the afternoon and evening, as the watch could be upgraded to a warning if severe storms develop.
