The bureau says a complex low pressure system over the Tasman Sea is combining with a high pressure system to the state's west to produce large southerly waves along southern and central parts of the coast.

Very heavy surf which may lead to localised damage and coastal erosion is possible for south-facing coastal zones south of Seal Rocks on Monday.

Beach conditions in these areas could be dangerous and people should stay well away from the surf and surf exposed areas. 

A hazardous surf warning is also current for the entire New South Wales coast.

Conditions are expected to ease later today as the low moves towards New Zealand.

Winds are likely to remain gusty throughout Monday while there is a strong chance of some good rainfall by the end of the week.

Meteorologist with weatherzone Graeme Brittain says maximum temperatures are likely to remain fairly consistent throughout the working week.

"Those winds will see gusts between 50 to 60 kilometres per hour and up to 70 km/h for exposed parts of the coastline," he said.

"The south westerly winds are likely to start to clear late on Monday evening.

"The maximum temperature is 17 degrees but there is a wind chill factor to consider as well, so it will probably feel about two or three degrees below that all day.

"Tuesday morning will see a cooler start with lighter winds and clear skies contributing for a minimum temperature of 1 degree, which is six degrees below the average for this time of the year.

"The maximum daytime temperature is expected to be 20 degrees."

Mr Brittain said Wednesday and Thursday's minimum temperatures will be between 3 and 4 degrees with a maximum for both days of around 19 degrees.

Both days are likely to be mostly sunny, dry and with no significant winds.

By Friday, conditions will change with an inland low pressure system likely to bring some possible good rainfall, Mr Brittain said.

"There is some uncertainty about the modelling and the amount of rainfall is quite difficult to forecast," he said.

"However, we are likely to see between 2 and 10mm of rainfall by late Friday while Saturday could see the best of the rainfall with between 20 and 40mm of rainfall possible.

"That rainfall could begin to clear by Sunday morning but we are still possibly going to see between 2 and 10mm of rainfall before that system clears."

Minimum temperatures for Friday and through the weekend are likely to be 5 to 6 degrees with maximum temperatures in the high teens.

The threat of damaging winds has eased for Port Macquarie, Newcastle, Sydney, Wollongong, Batemans Bay and Eden.

A gale warning for the Macquarie Coast continues for August 20.