Police will target out-of-control parties and unruly behaviour as Perth revellers prepare to ring in the new year amid a searing week-long heatwave.
Two new police vehicles, which can hold up to 14 detained people, will support the Regional Operations Group as it focuses on out-of-control New Year's Eve gatherings tonight.
With the Health Department warning about excessive alcohol consumption and staying indoors during this week's sweltering weather, it is expected many people will celebrate the new year at house parties or beach barbecues in a bid to keep cool.
WA Police Cdr Fred Gere said officers would be out in force, including on water and traffic patrols and with drug detection dogs.
"Police stations in popular locations in the metropolitan and regional areas will have additional staff seconded to their location to deal with the influx of tourists," Cdr Gere said.
Despite the stifling weather, thousands of punters will don their best threads to mark the new year at glamorous events across the city.
Hundreds will enjoy the night's balmy air at inner-city rooftop parties, including a masquerade ball at The Aviary, the Sky High party at Northbridge's Rooftop Cinema and a white party at the Conservatory.
While the City of Perth is saving all its fireworks ammunition for Skyworks on Australia Day, there will be midnight fireworks at Crown Perth and at a music festival on the East Perth foreshore.
Mandurah and Rockingham foreshores will also have fireworks for families looking for a free and low-key way to celebrate the new year.
The invitation-only Hopman Cup Ball remains Perth's hottest ticket but hundreds more glammed-up revellers will hit the Fire and Ice Ball at the Parmelia Hilton.
Punters planning to catch a cab home need to plan ahead. Taxis will be in heavy demand and there is a $5.55 surcharge from 6pm tonight until 6am tomorrow.
Security officers will be at the Milligan Street cab rank in Northbridge and the South Terrace rank in Fremantle tonight.
In his new year address, Colin Barnett said the people of WA had adjusted to cope with the growing pains of a booming city. The Premier said pride in their home State was growing.
Mr Barnett used the address to ask the community to "hold on to the qualities we still value" such as courtesy and kindness as Perth evolved into a bigger city.
He said the past year had seen many changes in WA and next year would have even more as several major projects got under way.
"West Australians have really embraced the changes in the city and the vision for its future, even if they don't like every aspect of the developments," he said.
"I have noticed that in the past year, people's pride in the State and the city is growing. I have noticed how this is reflected in the way West Australians behave and even in the way they dress."
In Sydney, pop princess Kylie Minogue will lead New Year's Eve celebrations as creative ambassador for the famous fireworks that this year will include a one-off musical note in her honour. Her theme for the event is "embrace".