Heaviest amounts are forecast for this afternoon and early evening, the national weather agency says.
Severe weather has prompted a number of cancellations and delays in our coverage area.
The forecaster warns that the afternoon commute could be particularly tricky, and air travellers are being advised to check on the status of their flights before heading out to the region's airports.
Much of the GTA is under the winter weather travel advisory; however, Halton Region is under a snowfall warning.
The snow is expected to taper off overnight and more flurries are possible on Tuesday.
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Toronto will see a high of -2 C today but the temperature will feel closer to -11 with the wind chill.
Vince Sferrazza, director of operations and maintenance for the City of Toronto, said that crews were working Sunday night in preparation for the snowfall.
"Last night we actually began pre-treating the expressways, hills and some other significant areas..."
Meanwhile, the City of Toronto is opening a warming centre at Metro Hall at 7 p.m. today.
Environment Canada urges drivers to adjust their driving with changing road conditions and cautions visibility may suddenly reduce at times with heavy snow.