Significant wave heights of up to 4 metres have and will continue to batter the NSW coast this weekend.

A strong burst of southerly winds moving up Australia's eastern seaboard is the reason behind this large swell. These winds were whipped up by a frontal system that crossed southeastern Australia.

At 3am AEDT Saturday morning, 4.0 metre waves were recorded at Crowdy Head, along the Macquarie Coast. Late on Friday evening, Batemans Bay (3.4m), Eden (3.3m), Sydney (3.3m) and Port Kembla (3.0m) recorded similarly large waves.

This swell is expected to continue throughout Saturday and into Sunday morning, where waves, particularly along the Macquarie and Hunter coastline, could again reach up to 4 metres.

Image: Wave Watch III Significant Wave Height forecast at 2pm AEDT on Saturday

 On Sunday the swell is expected to gradually ease as winds lighten and shift direction. However, a hazardous surf warning remains in place throughout the NSW coast for the entire weekend. Keep up to date with the latest warning information here.