The SES has urged residents to be prepared for wild weather forecast this weekend.
The Bureau of Meteorology has advised severe thunderstorms are on the cards Friday into Saturday, bringing with them the risk of heavy rain, large hail, and flash flooding.
Heavy rainfall is possible between the South Coast, Illawarra and extending to Canberra on Saturday.
The Bureau of Meteorology has also issued a marine wind warning for the Illawarra and Batemans coast on October 31.
NSW SES State Duty Commander Dean Storey said communities need to be prepared.
"We have seen parts of the state already get hit with severe storms, including communities out near Tamworth and Armidale," Mr Storey said.
"It is important that people move their cars from underneath trees and powerlines, clear their front and backyards of loose items, and check their gutters and downpipes for blockages to avoid any flooding."
Mr Storey also stressed the importance of people driving to the conditions of the roads during storms and heavy."
"This includes being mindful of floodwater," he said.
"If you come across floodwater, never drive, walk or ride through it.
"It doesn't matter how experienced a driver someone thinks they are, or if they think their car is capable - do not attempt to cross it," Mr Storey said.
Police have also urged road users to be cautious and factor the wet weather into their driving.
For more information on how to prepare for a storm, heavy rain or a flood, visit ses.nsw.gov.au.
For information on weather warnings and the latest forecasts, visit bom.gov.au.
To check the latest traffic conditions, please visit www.livetraffic.com.