A strong wind warning for the Illawarra coast has been cancelled on Friday afternoon.
The Bureau of Meteorology had issued the alert on Friday morning following heavy rain that lashed the city on Thursday night.
There was also a high chance of rain and possible thunderstorm with winds predicted to be south to southwesterly and between 25 to 40 km/h.
An update of the forecast shows only a "shower or two" is expected.
Illawarra State Emergency Service spokeswoman said crews received 18 calls for help across Wollongong and Shellharbour on Thursday night.
Wollongong SES's flood rescue operators rescued two people from a car trapped in flash flood waters at Cringila.
There were only two other flood rescues in Sydney across the state.
The spokeswoman said most of the SES jobs were completed and were not serious.
The downpour caused extensive delays on the South Coast train line and left hundreds of properties without power.
Almost 20,000 lightning strikes were recorded across the greater Sydney area. The storm triggered flash flooding, power outages and more than 600 calls to the State Emergency Service, mostly for fallen trees and damaged and leaking roofs.