But, Environment Canada said that the winds will "diminish quickly" later tonight, making way for a handsome day tomorrow.
Roughly 3,500 of those people in the dark are in the Walkerville neighbourhood, with small pockets also in the downtown, university area, South Cameron and South Central.
Environment Canada has issued a severe wind warning for the city of Toronto, alerting residents of the presence of strong, gusty southwest winds this afternoon and well into the evening.
As a cold front edges in later in the day, wind gusts up to 90 km/h are possible.
IPL: Young Gill powers KKR to comfortable win over CSK
Gill pulled and cut Asif for three sixes in the 15th over and hit two fours off Jadeja in the next to get his maiden half-century. But Narine's incredible spell of 4-0-20-2 ensured Chennai couldn't breach the 200-run mark despite a late charge by Dhoni.
Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are likely to produce or are producing one or more of the following: large hail, damaging winds, torrential rainfall. Remember, severe thunderstorms can produce tornadoes.
The thunderstorm and wind warnings are in effect for Windsor-Essex, Chatham-Kent and Sarnia-Lambton.
A low pressure system coming across Lake Huron will bring rain and thunderstorms along with the winds.
Winds will diminish late this evening as a high pressure ridge moves in.