Newcastle's beaches have been closed for a fourth straight day because of fears over a shark.

Continued sightings of a five-metre great white shark off the Newcastle coast has closed beaches for a fourth straight day.

Newcastle City Council beach inspector Mick Body says the closure has been the longest in his memory.

"We're a little bit frustrated, especially today because it's such a nice day," he said.

"We are still searching and being cautious, we're constantly getting sightings from members of the public."

Mr Body said he was waiting for the Westpac Life Saver Helicopter to fly over the coastline and hopefully give the all clear.

The helicopter has been busy with medical emergencies throughout Tuesday.

While some surfers have found the waves too tempting, most had kept clear of the water since the shark was first seen on Saturday afternoon at Merewether Beach.

The latest sighting at Dudley beach on Tuesday morning could indicate the shark was moving south of Newcastle, reversing its northbound route overnight.

Although a jet ski has been patrolling the beaches, Mr Body said a helicopter was needed to get a good look.

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Newcastle beaches shut over shark fears