The State Emergency Service (SES) had crews working over the weekend and into Monday morning after receiving more than 44 calls for assistance.

Port Macquarie SES unit controller Michael Ward said by Sunday evening more than 250mm had filled rain gauges with crews working hard to prevent further water damage at homes, many of which were impacted because of blocked gutters.

"Many of the jobs we attended over the weekend were preventable," Mr Ward said.

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He reminded residents that we remain in storm season and there are simple precautions and measures that can be undertaken to keep property safe in a severe weather event.

A marine wind warning remains in place for much of NSW's north coast, while most of the state is under a hazardous surf warning.

Flash flooding impacted low-lying areas, roads and bridges across the region over the weekend while a sink hole developed at Middle Rock beach car park caused by a crack in the stormwater pipe running under the road.

The road collapsed on Sunday afternoon forming a deep channel with stormwater, rocks and debris pouring out to sea.

The Bureau of Meteorology's Alex Majchrowski said the weather is expected to persist throughout the week.

In the 24 hours to 9am Monday, the Bureau of Meteorology recorded more than 124mm fell across Port Macquarie, 105mm at Lake Cathie and 72mm at Laurieton.

"A lot of the weather is due to that low pressure system just sitting to the northwest of Lord Howe Island," Mr Majchrowski said.

"Hazardous surf conditions will persist throughout today before easing on Tuesday, and the rainfall should start to ease from then as well."

Mr Majchrowski also said that a cold front would likely move across NSW late on Monday, with temperatures dropping by about 10 degrees.

Damaging winds would continue on Lord Howe Island until Tuesday.

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