At its peak, Hydro One reported over 230,000 homes and businesses without power, with areas in southwestern Ontario the hardest hit.
Winds will peak early this evening, and will ease near midnight.
"We're responding to a large area outage affecting customers in & around the area of Mortimer south to Danforth & Greenwood east to Woodbine".
Crews are still making repairs to scattered outages across Lambton County, restoration times are unknown.
Hydro One was also reporting dozens of outages across Grey-Bruce. A rainfall warning is in effect for areas like Sault Ste.
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Shortly after 4 p.m., Peel police said sheets of drywall were blowing on a Highway 401 westbound ramp from Hurontario Street.
The City of Toronto is under a wind warning, issued by Environment Canada, suggesting southerly gusts of up to 70 kilometres an hour in the morning, followed by westerly gusts of up to 90 kilometres an hour late in the afternoon.
Winds will then shift to very strong southwesterlies with gusts of 90 to 110 km/h beginning this afternoon.
Hydro One says its crews have been working flat out to restore the power for tens of thousands of customers after it was knocked out by a ferocious wind storm.
High winds could also cause tree branches to break and damage roof shingles and windows.