Australia Day celebrations in Brisbane are set to run as scheduled although rain and storms could mar festivities in parts of central and northern Queensland.

Rainy weather that has clouded the start of the public holiday long weekend in southeast Queensland is expected to clear in time for Australia Day festivities.

However, celebrations in other parts of the state could be dampened by showers and thunderstorms that are forecast for central and northern Queensland.

Bureau of Meteorology forecaster Michael Knepp says the sun should be out in the southern parts of the state, including the southeast, on Sunday.

“It should be fairly good conditions except along the coast where the wind might be a little bit strong,” he told AAP.

Mr Knepp said showers and thunderstorms were predicted for the Queensland coast north of Bundaberg and in northwest Queensland around Mt Isa and Cloncurry.

A spokesman for the Premier’s Department said Brisbane’s Australia Day Festival was set to run as scheduled.

Thousands are expected to visit South Bank Parklands for celebrations that will include a flag-raising ceremony, a flyover by air force jets and fireworks.

Meanwhile, about 4500 people have registered to become Australian citizens at ceremonies around the state, with one of the largest to be held at Brisbane’s City Hall.

The Gold Coast will host a huge inflatable waterslide at Evandale Parklands in Surfers Paradise as part of a day of entertainment at the park.

On the Sunshine Coast hundreds of giant inflatable thongs will be carried into the ocean at Mooloolaba to try to break the world record for the longest line of inflatable Havaianas joined in the water.

The record of 2093 was set last year in Western Australia.

Live music and a thong-throwing competition will mark the national day in Cairns while a fun run and a cricket match are some of the festivities planned for Townsville.