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Authorities in NSW are warning the downpour over recent days has driven Warragamba Dam to reach almost full capacity.

WaterNSW said today it expects the dam - the main water supply for the Greater Sydney region - to hit peak capacity in coming hours.

"If you are downstream of the dam, stay away from fast flowing or deep water near waterways and floodplains.

Sydney's Warragamba Dam is expected to spill after days of heavy rainfall.

"These hazards potentially threaten the safety of you and your property. Never drive, ride or walk through floodwater."

Residents near Warragamba Dam are being urged to monitor weather conditions over coming hours.

Meanwhile, the Bureau of Meteorology says the winds and heavy rain across eastern NSW will ease from today.

The severe weather warning has been cancelled, but the SES says rising river levels remain a risk as floodwater moves downstream.

Emergency workers were kept busy over the weekend, responding to flooding, storm damage and snow impacts after a complex low-pressure system moved across the Northern and Central NSW coast and ranges.

The SES has been kept busy responding to thousands of incidents. (NSW SES)

Since the onset of the severe weather, the SES received more than 3600 calls and responded to 2092 incidents, including 25 flood rescues.

There is an emergency warning for major flooding along the Namoi River at Gunnedah, and people in low-lying properties have been asked to evacuate. Further evacuation warnings are possible throughout today.

At Tamworth, the Peel River peaked just below the major flood level, with moderate flooding continuing today.

In the Upper Hunter, an emergency warning for parts of Raymond Terrace advises people to evacuate. A moderate flood warning remains for the Hunter River at Denman, which peaked just below major overnight it has now fallen below moderate thresholds.

Minor flood warnings are current for the Manning, Gloucester, Macleay, Severn, Paterson, Williams, and Gwydir Rivers.

There are still more than 50 warnings current for residents across the Mid North Coast, Upper Hunter and New England regions.

For flood advice ring NSW SES on 132 500.