Surf life savers are urging caution on the NSW coast as a southerly swell intensifies during the first days of winter.
Southern-facing beaches are likely to bear the brunt of the powerful conditions, with sets in excess of four metres predicted for some areas.
NSW Surf Life Saving spokesman Andrew Ugarte says volunteer patrols have finished for the season and only a few NSW beaches are manned by lifeguards.
"While the strong winds and large waves are likely to deter many people from entering the water over the next couple of day, it is important that beachgoers are still mindful of the conditions," he said in a statement.
Friday also marks the first day rock fishers will be required to wear a life jacket along much of Sydney's eastern suburbs in the Randwick local government area.
Under the new rules anyone not wearing the safety gear in the Randwick area can be fined $100.