Hazardous surf conditions are forecast for the NSW coastline for Friday and across the weekend as Ex-Tropical Cyclone Uesi generates large swell.
Offshore rescue boats based in Kiama, Sydney and Ballina are on standby to respond to any critical coastal incidents.
The Bureau of Meteorology has issued a Hazardous Surf Warning for the coast due to the severe weather being generated by Ex-Tropical Cyclone Uesi.
Surf Life Saving NSW lifesaving director Joel Wiseman said that surf conditions on the NSW coastline Saturday and across the weekend will be large and dangerous.
"With conditions forecast to be hazardous today and across the weekend, we are urging members of the public not to engage in risky coastal activities," Wiseman said.
"If people don't heed emergency service warnings and put themselves in danger in these extreme conditions, it's possible that lifesavers will not be able to save them."
With damaging sea swell forecast in many locations, there is a threat of coastal inundation and erosion in low-lying areas.
Large tidal surges are a possibility in some areas which will exacerbate the damage caused by the extreme weather event last weekend.
In anticipation of the forecast hazardous surf and high wind conditions, Surf Rescue emergency call-out teams will remain on high alert from today and across the weekend.
Some NSW beaches may be closed on the weekend due to the large swell, poor water quality and large amounts of debris in the water in some areas.
This weekend's Illawarra surf lifesaving championships have been called off.
The Thirroul carnival - originally scheduled for February 8 - was postponed due to dangerous surf conditions.
"Ex-Tropical Cyclone Uesi will produce very large and damaging surf. It will create extremely dangerous conditions for swimmers, surfers, rock fishers and boaters," Wiseman said.
"Surf Life Saving NSW anticipates that some NSW beaches may be closed this weekend due to dangerous surf conditions. If lifesavers and lifeguards haven't put the red and yellow flags up, the beach is not safe for swimming."
Visit beachsafe.org.au or download the Beachsafe App, to find patrolled locations and up-to-date beach conditions.