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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Perspective Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
A weather warning today from Environment and Climate Change Canada covers southern Ontario and the Ottawa Valley, with lake-effect snow squalls expected to reduce visibility and create hazardous travel through the evening commute.
Which regions are under a weather warning right now?
As of this morning, a weather warning for Ontario includes Toronto, the Greater Toronto Area, and stretches east toward Kingston and Ottawa. The weather warning Ottawa issued by the national agency warns of bursts of heavy snow and sudden whiteout conditions. This southern Ontario weather warning today is driven by a sharp cold front crossing the Great Lakes, producing intense snow squalls off Lake Huron and Georgian Bay.
How should you prepare for a weather warning today?
If you are in an area under a weather warning today, limit non-essential travel and allow extra time for any trips. Carry an emergency kit in your vehicle, watch for rapidly changing conditions, and monitor local forecasts. For real-time updates on ontario weather warnings today, check our Canada Weather Warnings page or the Environment Canada alerts map.
What is the difference between a weather warning and a watch?
A weather warning means hazardous conditions are occurring or imminent. A watch indicates that conditions are favourable for a hazardous event but the timing or location remains uncertain. Warnings demand immediate action; watches call for preparedness.
Why does the Lake Ontario shoreline get frequent weather warnings?
Lake-effect snow forms when cold air moves over the relatively warm lake waters, picking up moisture and dumping snow in narrow bands. The Toronto and Ottawa corridors lie directly downwind of Lake Ontario and Lake Huron, making them prone to sudden snow squalls each winter.
Where can I find the latest canada weather warnings today?
Environment and Climate Change Canada issues official warnings at weather.gc.ca. You can also visit our Canada weather hub or use this page for a curated list of active weather warning for Toronto, Ottawa, and the rest of the country.