Newcastle's beaches remain closed due to a shark, nicknamed Bruce, that is disrupting swimmers.

A five-metre great white shark, nicknamed Bruce, has failed to keep Newcastle beachgoers from dipping their toes, and more, into the water.

The problem is, it's summer, it's stinking hot and it's school holidays.

Beaches in the coastal NSW city remain closed for a record sixth consecutive day on Thursday after further sightings of the huge shark, first spotted on Saturday at Merewether Beach.

But scores of swimmers and surfers defied warnings and have taken to the water at Newcastle's beaches on Wednesday, when the mercury hit a high of 34 degrees, and Thursday, when it reached 28C.

The last confirmed sighting of the shark was at Nobbys Beach on Wednesday afternoon when more than 50 swimmers and surfers reportedly hit the water at Newcastle Beach.

Lifeguards continued their patrols on Thursday.

"The lifeguards there are doing their best to inform people of the danger and to keep them out of the water, but on a day like yesterday when it was 35 degrees and such a good day, it's hard to keep them out," said Nobbys Beach lifeguard Isaac Morgan.

"If we see people swimming in the water, we try and direct them over to the baths," he said.

Lifeguards and hotel guides have been directing bathers to the city's two natural ocean pools - Merewether Ocean Baths and Newcastle Ocean Baths.

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Beaches might shut for another day