Snowfall, with total amounts of 15 to 20 cm is expected.
It will bring snow to the area this afternoon which will intensify across Southern Ontario this evening.
Toronto's Pearson International Airport issued an advisory amid the snowy conditions.
"Snow will begin late Sunday afternoon with the bulk of the snow falling Sunday night".
Police also urged motorists to slow down and leave plenty of time to get around. "Roads are very slippery give yourself plenty of time", Toronto police said in a tweet.
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Northern Rhode Island residents have a chance to wake up to a white Christmas Monday, with a winter weather advisory in effect for the area from 10 p.m. Christmas Eve through 1 p.m. Christmas Day.
Active weather is expected to continue throughout the week in Toronto as temperatures are expected to drop.
While no further snowfall is expected Monday, gusting winds could continue to keep visibility poor on the roads.
Poronaysk, with a population of just 16,000, is expected to be blanketed by 50 cm of snow on Christmas Day. Travelers are encouraged to adjust their plans if possible.