BIG SURF: Dangerous conditions at Currumbin Alley on the Gold Coast. Picture: Jono Searle Source: The Courier-Mail

LIFESAVERS have warned people to keep out of the water as huge swells pound southeast Queensland and northern NSW beaches.

All beaches except two were closed on the Gold and Sunshine coasts yesterday.

Appealing to people to follow directions, Gold Coast City Council chief lifeguard Warren Young said lifeguards had been placed in danger trying to rescue stubborn swimmers.

"It's not right that people put others' lives at risk," he said.

Beaches would remain closed this morning and the situation reassessed in the afternoon.

Sunshine Coast chief lifeguard Scott Braby said all beaches were closed except for Noosa and Mooloolaba.

"We'll reassess things (today). It might be dropping a little," he said.

Weather Bureau forecaster Michelle Berry said a low about 400km east of Cape Moreton was generating the dangerous swell.

Queensland's cold snap is set to ease, with average temperatures expected for the rest of the week after Brisbane got down to 11C.

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Swell danger closes southeast beaches