Cronulla beach suffered severe erosion when big seas pounded the oceanfront during the extreme weather event on Sunday.
A large amount of sand has disappeared from the northern end of the beach, exposing big boulders which have been placed there in the past to counter erosion.
Concrete steps that normally lead gently to the sand now end in a big drop.
The Leader reported early on Monday the beach had escaped substantial damage, but the full picture later became apparent, particularly at low tide.
Sutherland shire Council has erected safety barriers around the area.
At high tide on Tuesday, waves were crashing over the Esplanade at this point.
While the erosion is not as severe as during the big storm in June 2016, the damage is substantial and the council faces another costly sand restoration process.
In 2016, thousands of tonnes of sand were sucked into the ocean, exposing masses of hidden boulders at the northern end of the beach and rock shelves.
Some older residents claimed it was the worst damage since the 1974 storm, which caused massive damage.
