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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scope Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
If you are in southern Ontario today, check the current alerts from Environment and Climate Change Canada before heading out. A weather warning means conditions that could cause harm or disruption—such as heavy snow, freezing rain, or severe thunderstorms—are imminent or already occurring in your area.
What does a southern Ontario weather warning mean for today?
A weather warning issued by Environment and Climate Change Canada signals a high likelihood of dangerous weather within the next 24 hours. For southern Ontario today, this could include snowfall rates above 2 centimetres per hour, ice accretion from freezing rain, or gusts that exceed 90 km/h. The warning is typically tied to a specific region or municipality, so the exact threat—and its timing—will vary between, say, Niagara and Ottawa. Always confirm your location on the southern Ontario weather warning today map available through Environment Canada’s alerts page.
How should you respond to an active warning?
When a warning is active, delay non-essential travel if road conditions are poor, and secure loose outdoor items if high winds are forecast. Power outages from freezing rain or wind are possible; having a flashlight and charged phone nearby is practical. For a live view of changing conditions, consult the southern Ontario weather warning today live feed from your regional forecast office. If the warning extends into the following day, the southern Ontario weather warning tomorrow updates will be posted by mid-evening.
Are there different types of weather warnings in southern Ontario?
Yes. The main categories are winter storm, snowfall, freezing rain, rainfall, wind, and severe thunderstorm warnings. Each is triggered by specific criteria set by Environment Canada. A watch means conditions are possible; a warning means they are imminent or happening.
How often are southern Ontario weather warnings updated?
Alerts are updated as new data arrives—often every 3 to 6 hours during an active event. For rapidly changing storms, updates may come hourly. Check the southern Ontario weather warning today hourly updates through Environment Canada’s weather page for the latest timing.
Do northern Ontario weather warnings differ from southern ones?
The criteria are the same provincially, but northern Ontario weather warnings today often involve extreme cold and blizzard conditions more frequently than in the south. Southern warnings are more likely to include freezing rain and heavy, wet snow due to proximity to the Great Lakes.
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Related reading: Canada weather hub · Weather Warning · Weather Warning Toronto · Canada Weather Warnings