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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the BuzzLayer Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Southern Ontario is in for a sharp shift as a cold front sweeps across the region late this week, bringing a risk of lake-effect snow squalls east of Lake Huron and Georgian Bay. The live forecast above shows the current conditions and the timing of the change.
What is driving this week’s weather pattern?
A strong low-pressure system tracking north of the Great Lakes will drag a cold front through Southern Ontario late Thursday and into Friday. Behind it, a northwesterly flow will pull frigid air across the relatively warm lakes, triggering intense lake-effect snow bands. These bands can produce rapid accumulations and whiteout conditions, especially for areas like London, Barrie, and the Bruce Peninsula. Environment Canada has issued snow squall warnings for these zones, and ontario weather warnings today cover much of the lakeshore region.
How long will the unsettled weather last?
The lake-effect snow will persist through Friday and into Saturday morning before a ridge of high pressure builds in. By Sunday, skies will clear and temperatures will moderate, though a southern ontario weather warning today remains in effect for squall-prone areas. Looking ahead, the weather in ontario 10 days shows a return to near-seasonal readings next week, with no major storms on the horizon. For a broader look at the province, visit our Canada weather hub.
Where can I see a southern ontario weather warning today map?
Environment Canada’s weather.gc.ca site provides an interactive map with all current warnings. Look for the “Warnings” layer to see squall watches and warnings across Southern Ontario. The map updates in real time as conditions change.
What is the southern ontario weather 14 day forecast?
Extended forecasts beyond 10 days have lower confidence. However, most models suggest a dry and seasonably cold pattern for the second week, with daytime highs near -2°C to -4°C and overnight lows around -10°C. Check back for updates as the pattern evolves.
Is there a southern ontario weather warning tomorrow?
Yes, lake-effect snow squall warnings are likely to remain in effect through Friday for areas east of the lakes. The risk of sudden whiteouts will persist until the flow shifts. Travel may be hazardous in squall bands, especially on Highway 400 and 401 corridors.