Published on Apr. 5, 2026, 3:50 PM
Don’t put away the winter gear, yet. Southern Ontario is facing an abrupt return to winter weather with plunging temperatures, incoming snow and strong wind gusts–impacting early-week commutes
Southern Ontario will take a step back into winter early this week as temperatures will tumble back into the single digits, with the chance for snow to spread across into early this week. Brace for slippery roads and tricky travel.
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Over the next couple of days, a deepening trough will build across southern Ontario, siphoning in Arctic air from Nunavut. This air mass exchange will have a drastic impact on temperature and the weather pattern to kick off the week.
Weather Highlights
Sharp cooldown as Arctic air sends temperatures plummeting Sunday
Wintry conditions spread into the region on Sunday evening for parts of the region
More organized snow possible Monday night
April chill, snow return to southern Ontario
The first several days of April have featured volatile temperature swings and changeable weather across southern Ontario. Temperatures on Friday soared to Canada’s warmest values this year, reaching 25.8°C in the Hamilton srea.
Winds have been particularly gusty, as well, at times reaching 70 km/h, along with scattered thunderstorm activity.
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Through Sunday night into Monday, bursts of snowflurries are forecast near Georgian Bay, Dundalk and eastern Ontario.
Widespread temperatures will be below freezing to start Monday.