The Fairfield State Emergency Service are reminding residents to not drive through floodwater, tie things down in case of wind and do not park cars under trees during a storm.
The advice comes as Fairfield was hit with more than 300 milimetres of rain across the weekend.
Fairfield SES received 237 calls for assistance across the four days consisting of leaking roofs, fallen trees and assistance in rising flood waters.
A team of 30 volunteers answered the call for help over the weekend with roads around Railway Parade/Sussex St, Cabramatta, Cook Ave at Canley Vale and Knight Street at Lansvale the hardest hit.
The Canley Vale commuter car park lower level was flooded with several cars caught in them.
The deluge is not over yet, with heavy rains and damaging winds again forecast to lash Sydney and the state of NSW.
NSW Police Assistant Commissioner Karen Webb urged drivers to take caution and avoid floodwaters.
"There are currently hundreds of calls for assistance, including trees, boulders or power poles down onto cars and homes, and across roads, as well as power outages and localised flooding impacting various roads and traffic lights," she said.
"I'm disappointed that I need to remind people to act responsibly and not to take risks in these types of conditions, especially when around floodwaters."
Dams around Sydney, including the major Warragamba Dam, are swelling to their highest levels in years.