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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Toronto Post Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Environment and Climate Change Canada has issued weather warnings for southern Ontario, including a weather warning Toronto and an Ottawa weather warning today, with wind chill values between -30°C and -35°C expected through Thursday morning. These extreme cold warnings cover most of the region, meaning exposed skin can freeze in under 10 minutes.
What are the current Ontario weather warnings today?
As of early Wednesday, a widespread extreme cold warning is in effect for southern Ontario weather warning today zones, including Toronto, Ottawa, and the Greater Toronto Area. Wind chill values will range from -30°C to -35°C overnight and into Thursday morning, with daytime highs near -18°C. The warning is expected to lift by Thursday afternoon as a milder airmass moves in.
How should I prepare for a weather warning today?
Limit time outdoors, dress in layers with a wind-resistant outer shell, and cover all exposed skin. Check on vulnerable neighbours and ensure pets are indoors. For the latest updates on Canada weather warnings today, monitor local alerts. If travel is necessary, keep an emergency kit in your vehicle, including blankets and a flashlight.
What is the difference between a weather warning and a weather advisory?
A weather warning means severe conditions are occurring or imminent, posing a threat to life or property. An advisory indicates less severe conditions that may cause inconvenience but are not immediately dangerous.
Will the Ottawa weather warning today affect flights?
Extreme cold warnings typically do not ground flights, but airlines may delay departures for de-icing. Check with your carrier for real-time updates. Ottawa International Airport is operating normally as of Wednesday morning.
How long will the southern Ontario weather warning today last?
The warning is expected to expire by Thursday afternoon. A warming trend will bring daytime highs near -5°C by Friday, though overnight lows will remain cold. For the extended outlook, see our Canada weather hub.