Australia bushfires: Emergency services prepare for more catastrophic conditions as temperatures soar

Australian emergency services are bracing for another catastrophic day of bushfires on Saturday with temperatures set to soar yet again.

Winds are also expected to speed up and authorities are warning the flames could move frighteningly quickly if they do.

Thousands of people are fleeing coastal towns, and emergencies have been declared in New South Wales and Victoria.

Early Saturday (local time), the NSW Rural Fire Service (RFS) said 137 blazes were burning across the state with more than 60 yet to be contained. More than 2000 firefighters have worked overnight to prepare for the predicted severe and extreme fire danger on Saturday.

In a Twitter post late Friday, the RFS said southern NSW will experience dangerous fire conditions on Saturday.

"If you are in the path of these fires leave tonight [Friday] before these conditions worsen tomorrow morning."

The Australia Bureau of Meteorology says "severe heatwave conditions" are expected through central NSW on Saturday, with temperatures ranging between the mid-30s and mid-40C.

Campgrounds throughout the city will not be open on Saturday due to the looming threat of bushfires, The Sydney Morning Herald reports. Among those were the Royal National Park.

In Victoria, a state of disaster was declared earlier this week, and the local government issued an additional six "evacuate now" alerts overnight.

It was the first time the Victorian Government had used its state of disaster powers since they were introduced in 2009. Since Monday, eleven people have died in both NSW and Victoria.

Meanwhile, NSW's Emergency Services Minister has apologising for jetting off to Europe amid the crisis. 

David Elliott returned on Friday night and admitted his trip was "inexcusable". 

It comes a week after Prime Minister Scott Morrison made a similar apology for travelling to Hawaii with his family.