Revellers will be out in force tonight with a range of events and gigs planned for New Year's Eve but police are warning them to be on their best behaviour.

MetService predicted sunshine and a high of 24C for today, tomorrow and January 2.

The biggest events were expected to be the Mount New Year's Festival, Mount Vibes and The G2 Resolution NYE Party.

The temporary jail behind Mount Maunganui's police station infamously known as "Alcatraz" had been set up for tonight.

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Senior Sergeant Deirdre Lack said holiday-makers had been well behaved and she did not expect much trouble.

"We've done a lot of build-up work so we wouldn't expect there to be too many people in here," she said as she showed the Bay of Plenty Times through the makeshift cells.

Ms Lack expected a large number of people to be out and about following the cancellation of other popular New Year's Eve festivals such as Coro Gold.

Ms Lack said three teams would be stationed at Mount Vibes but the busiest period would come as people were leaving after the concerts wrapped up.