Lifeguard supervisor James Turnham said the hazardous conditions look set to continue for the next few days.

"Conditions will ease through the week but we still advise no swimming or surfing on beaches today," he said.

Beaches appear unlikely to reopen at any stage today, February 24.

"We have king tides, large swell and strong winds combining to make all water activities along the coast extremely dangerous.

"Even those walking along the beaches and breakwalls should be cautious with strong surges and unpredictable large waves."

The Bureau of Meteorology has issued a hazardous surf warning along parts of the NSW coastline for Sunday, February 24.

The BOM says surf and swell conditions are expected to be hazardous for coastal activities.

These include rock fishing, boating, and swimming.

Surf Life Saving NSW recommends only swimming at patrolled beaches and between the red and yellow flags.

The hazardous surf warning covers the Byron Coast, Coffs Coast, Macquarie Coast, Hunter Coast and Sydney Coast.

A strong wind warning is in place for the Macquarie Coast Byron Coast and Coffs Coast.

Weatherzone meteorologist Lachlan Maher says we can expect continued dreary conditions throughout Sunday and the much of the following week.

There could also be the chance of showers along the coastal fringe too.

But these showers will be light and intermittent, he said.

"Sunday, February 24, will be a dreary, cloudy kind of day," the weather forecaster said.

"And these conditions look set to continue into Monday. The modelling suggests that these showers will continue along the coastal fringe but the further you move inland, they will ease off.

"These showers are being driven by a coastal flow and a high pressure system in the southern Tasman.

"It is also due, in part, to the remnants of Oma which is continuing to drive moisture toward the coastal areas."

Mr Maher said winds will be "a bit dusty along the coast" for Sunday.

Oma is lingering  - but a fair bit offshore - and while it is tracking north, we can expect winds to start to drop off around midday on Monday.

Mr Maher said the dreary, overcast conditions, along with some light showers along the coastal fringe look like continuing throughout most of the weekday.

Winds to sea are strong but are likely to begin to decrease. 

The weather forecaster said the swell will persist a bit longer into the week.

"Significant wave heights of 4 metres are likely off shore but easing to about 3m on Monday and 2m by Tuesday," he said.

"On-shore wave heights will peak today (Sunday) at around 2.8m before dropping to around 1.5m by the middle of the week."

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