A 34-year-old man has died after being pulled from the water at Jervis Bay on Saturday afternoon.

Police and emergency services were called to Greenpatch Beach, on the southern shore of Jervis Bay, at about 4.45pm on Saturday, following reports of several people struggling to stay afloat in rough conditions.

The NSW man was brought back to shore, where CPR was begun; however, he was declared dead at the scene.

Three other people were assessed by paramedics, with none requiring further medical treatment.