Forecast CentreThe Weather Network
Published on Dec. 8, 2025, 12:18 PM
A brief surge of Arctic air kicks off the week in southern Ontario, leading to the coldest day in nine months
Southern Ontario faces some of the coldest temperatures since last winter as the new work week begins.
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Daytime highs will hover around -6°C in Toronto on Monday, marking the lowest highs since January and February. Temperatures are sitting approximately 10°C below seasonal averages.
Wind chills will vary across the region, with northern areas feeling temperatures in the minus teens. Ottawa is also set to see its coldest daytime high since March.
Temperatures are expected to rise slightly by mid-week before another plunge occurs heading into the weekend and early next week.
Colder-than-normal conditions are anticipated to persist through much of December. Although a few milder days may occur, no significant shift in the weather pattern is expected this month.
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Stay safe out there as hypothermia can be a real risk this time of year.
