A freezing rain warning was issued Friday for areas including Waterloo-Wellington, Huron-Perth and southern portions of Grey-Bruce.
"Significant icing and gusty winds are expected", the weather service said, with total ice accumulations of around half an inch.
Power outages began Saturday around noon as rain turned to ice along power lines. The temperature will fall to minus 3C in the afternoon.
The freezing rain could cause ice accumulations of up to 20 mm in some places.
- McMaster University and Mohawk College are both closed Saturday because of the freezing rain warning for the region.
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In the Greater Toronto Area, the weather agency predicts that there could be ice buildup of about 15 millimetres, noting that ice pellets are also likely.
After a Saturday night "lull", another area of snow and ice pellets is expected to move into the region Sunday morning.
"Precipitation may start out as rain, but increasing northeasterly winds will draw colder air from an arctic high pressure system to the north, resulting in a changeover to freezing rain".
An area of rain and isolated thunderstorms is expected to affect extreme southwestern Ontario.
Surfaces such as highways, roads, walkways and parking lots will become icy, slippery and extremely hazardous.
Hydro One said it has crews ready to respond to outages 24/7, and additional resources are on standby this weekend.