Home › Weather › Ontario Winter Weather Forecast
Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Maple Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Ontario’s winter weather forecast points to a colder-than-normal season with above-average snowfall across southern snowbelt regions. The live forecast above provides current conditions and short-term updates.
What does the long-range forecast for southern Ontario indicate?
Seasonal models show a persistent La Niña pattern through winter, which typically pushes the jet stream south. This brings colder air and increased precipitation to southern Ontario. For the best long-range weather forecast for southern Ontario, the trends in the live forecast above are a reliable guide. The southern Ontario winter weather forecast also suggests a higher frequency of storm systems crossing the region. For daily provincial updates, check the Canada weather hub.
What are the key weather risks this winter?
Lake-effect snow remains the primary hazard, especially east of Lake Huron and Lake Ontario. Heavy snow squalls can reduce visibility and cause road closures. A 30-day long range weather forecast for southern Ontario can help identify active snow periods. Cold spells in January and February may trigger extreme cold warnings. For city-specific forecasts, see the Toronto weather and Ottawa weather pages. A detailed 10-day outlook is available on the Weather 10 Days page.
When will the coldest temperatures occur?
The coldest stretch is expected between early January and mid-February. Arctic air intrusions may bring wind chills below -30°C in northern Ontario, with southern regions seeing overnight lows of -15°C to -20°C.
Will this winter be snowier than average?
Snowfall is predicted to be above average in southern Ontario’s lake-effect belts, especially east of Lake Huron and Lake Ontario. Other areas should expect near-normal snowfall with a few significant storms.
How reliable are long-range winter forecasts?
Long-range forecasts are most useful for identifying broad trends like whether a month will be colder or snowier than normal. For precise daily forecasts, refer to the 10-day outlook on Civic Maple.