The New South Wales State Emergency Service (SES) is on standby this morning, with a low pressure system bringing increasing rain along the south coast.
The SES says conditions have eased since the wild weather began on Saturday, but rainfall is expected to pick up again this morning.
Crews have received around 350 calls for help with leaking roofs and fallen trees since the wild weather began.
Spokesman Todd Burns says crews are not expecting any serious incidents today.
"Usually in this type of rain, we will just experience leaking roofs and trees down," he said.
"So hopefully it won't get any more serious than that."
The Shoalhaven copped the brunt of storms last night.
Greg Murphy from the Illawarra South Coast SES says it received 155 call outs with half of those in and around Nowra.
"A high majority of them are leaking roofs and overland flows," he said.
"Later yesterday quite a few trees started to fall as well as the wind hit later last night so we have had a full range of jobs."
Some rural residents further inland may face evacuation today.
The Goulburn region has received nearly 100 millimetres of rain in the past 24 hours with another 50 millimetres expected.
The State Emergency Service says some roads are already under water.
Meanwhile, motorists planning to use the Illawarra Highway are being asked to make alternative arrangements because of flooding.
Traffic is also affected in both directions on the Princess Highway near Bewong.
© ABC 2013
14:22 EDT Autumn has begun in a warm and thundery way across much of New South Wales and it looks like lasting into the weekend.