Sutherland Shire SES volunteers carried out 262 jobs between Friday and Tuesday as a result of damage caused by powerful winds and driving rain.
An SES spokeswoman said the shire unit was the "busiest in Sydney and the Blue Mountains by far".
One incident occurred on Monday evening after the wind died down.
A large gum tree fell across the driveway of the Fire and Rescue station, next to the Five Ways at Miranda.
Station Officer Ian Macauley said, "We had just got back from another call and were backing the truck in when the tree came down".
"We were lucky - had we driven in a couple of seconds later, we might have been under it," he said.
"The tree took out two power poles, and there were live wires across The Boulevarde.
"The Boulevarde was closed in both directions until Ausgrid made the area safe.
"The SES came and cut up the tree, and we assisted."