More wild weather for NSW

NSW's northeast is set for another night of heavy rain and high winds as a trough extending from devastating Cyclone Marcia moves out to sea.

Emergency workers have so far responded to more than 700 requests for help in the region following the arrival of wild weather and localised flooding.

Damaging winds of about 65 km/h featuring peak gusts of 100 km/h are forecast for southern parts of the Northern Rivers and parts of the Mid North Coast before the low pressure system departs land on Sunday, the Bureau of Meteorology says.

A State Emergency Service spokeswoman told AAP response crews would remain on hand, with gale force winds likely to buffet the Byron, Coffs and Macquarie coasts on Sunday.

The SES has responded to 727 jobs since Friday, mostly related to inundation, minor property damage and fallen trees.

Most of the calls have come from Tweed Heads and Ballina.

Strong winds forecast for Saturday night could mean a pick-up in the requests, the spokeswoman said.

On Saturday night the BoM said flood warnings were current for the Tweed, Brunswick, Richmond and Wilsons Rivers.

It said the town of Lismore was experiencing minor flooding.

Widespread rainfall of 50 to 80mm is forecast with local falls as high as 100 to 150mm in the Northern Rivers district, with winds of up to 100km/h.

A flood watch is current for the Tweed Valley, Brunswick Valley, Richmond and Wilsons valleys, Clarence Valley, Bellinger Valley and Nambucca Valley.

The bureau said there was a more than 70 per cent chance of flooding in the areas on Saturday and Sunday.