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Huge waves and strong winds battered Bondi on Wednesday.

Beaches along much of the NSW coast are copping a battering from gale-force winds generated by a deep low pressure system over the Tasman.

Sydney's beaches and the harbour were hit by wind gusts of as strong as 93km/h in the early hours of Wednesday, with Wattamolla to the city's south registering winds of 115km/h.

The Bureau of Meteorology issued a severe weather warning for the regions from the Illawarra up to the mid north coast.

Sightseers scramble to safety as big waves lash Dee Why beach. Photo: Nick Moir

"Very heavy surf, which may lead to localised damage and coastal erosion, is forecast for the Hunter and southern parts of the mid north coastduring Wednesday," the bureau said.

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Brett Dutschke, a senior meteorologist with Weatherzone, said that, by mid-morning, the winds had eased in the Sydney region but should pick up again in the afternoon.

"Beaches will continue to get a hammering throughout the day," Mr Dutschke said.

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Beaches pummelled by strong winds and surf