The shark lurks behind a lifesaver on a jet-ski on Saturday. Photo: Nicholas Tonks

Newcastle beaches have been closed for a third straight day following the sighting of a great white shark off the city's coastline.

Lifeguards spotted the large shark on Monday morning and are monitoring its progress between Nobbys and Stockton beaches.

Newcastle City Council confirmed that jet-ski patrols on Monday had sighted the shark again, moving between Stockton and Nobbys.

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The beaches will not reopen until Tuesday at the earliest.

Nobbys beach inspector Paul Bernard said: "Our beaches are currently closed and the rest of the city's beaches will once again be closed today."

The shark is believed to be the same one that was first seen on Saturday afternoon at Merewether Beach and it appears to have moved up north, with the entire coastline being shut down.

A Westpac helicopter patrol on Monday morning returned with no sighting but lifeguards are continuing their watch.

"People have been sighting it from the break walls and lifeguards have been seeing fins in the water," Mr Bernard said.

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Newcastle shark sighting: Beaches closed after great white spotted over weekend