Meteorologist Miriam Bradbury said the worst rain had passed for the Central and South Coasts after heavy falls overnight.
Falls of between 50-100mm rained down between Port Macquarie and Nowra, with more than 100mm north of Sydney.
Almost 200mm fell around Belmont, in the Lake Macquarie region.
“We will continue to see showers across the coastal parts of NSW today, but the rainfall totals we’re looking at for the remainder of today will really ease off,” Ms Bradbury said.
The rain system will instead move west to inland NSW, trending away from steady heavy falls to showers and isolated thunderstorms across central and eastern NSW.
Meanwhile, after multiple evacuation orders yesterday and warnings still in place throughout the Sydney region, Ms Bradbury said the rivers still bore watching.
“The Nepean and Menangle reached a peak under seven metres yesterday afternoon,” she said.
“It’s dropping. That’s comparable to the April 1988 flood level there.”
But she said the impact of the heavy rainfall could continue for days, especially combined with spillage from the Warragamba Dam.
“It’s quite likely we’ll see further river rises, particularly downstream today, and some changing flood conditions there,” Ms Bradbury said.