Great white shark closes Newcastle beaches

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.

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

It's believed to be the same shark 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 told AAP.

"It's quite irregular to have them hanging around constantly," he said.

He cited increased marine activity, overcast and warm weather as possible reasons for the shark's prolonged presence.

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Great white shark closes Newcastle beaches