The agency has reminded people to put away loose items around their home, move cars under cover and to stay clear of fallen powerlines.
On Friday, Bureau of Meteorology forecaster Abrar Shabren said a line of thunderstorms was moving across the Sydney area but had cleared by the evening as a cold front settled in.
Sydney Airport recorded wind gusts of 100km/h on Friday afternoon, while Camden recorded 115km/h and Denison recorded 106km/h.
“We have rain, but not that heavy,” he said. “This line of storms, which are moving across, have a lot of down draughts. That is why we are seeing so much wind and horizontal rain.”
On Friday, Sydney experienced warm and sunny weather during the day, topping 24 degrees in Penrith. By 5pm, temperatures had plummeted to 11.5 degrees.
The fast-moving storm front caused 200 electrical hazards, bringing down trees and branches over powerlines, interrupting power for about 19,500 customers.
By 6am on Saturday, about 2100 customers across western Sydney were without power.
“Additional crews from the Blue Mountains and South Coast are travelling to Western Sydney this morning to help with the restoration effort,” a statement from Endeavour Energy said.
“There is still many hours of work ahead with 140 electrical hazards needing repair before supply is back on to affected homes and businesses.”