The national park will remain closed today as conditions are forecast to worsen.
Several fires are burning out of control and firefighters face for another hot and dry day on Sunday, with total fire bans in place for parts of the state.
More than 100 firefighters battled the blaze on Saturday evening, supported by water bombers and aircraft.
The Sydney's south, firefighters are now battling an out-of-control blaze in the Royal National Park.
Hundreds of hikers and tourists had to be rescued by boat as the blaze spread on Saturday but firefighters, with the help of a large air tanker, worked throughout Sunday to contain the fire.
Embers are believed to have caused a second fire nearby on Sir Bertram Stevens Drive at Flat Rock.
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Authorities have said beaches may provide safety for people who are unable to leave and the park is now closed to the public.
Given the limited mobile coverage in the Royal National Park, Mr Morris said many people in the bushland were "unlikely" to have received emergency text warnings.
In the southern tablelands, a bushfire has burnt more than 1600 hectares at Bannaby, with firefighters working overnight to establish and strengthen containment lines.
A number of bushfires sparked across the state of New South Wales on Saturday, with temperatures soaring above 39C in some areas as a heatwave advanced across the eastern states where the Bureau of Meteorology issued fire weather warnings.
Meanwhile, firefighters continue to battle with a bushfire that's burnt about 20,000 hectares in the Pilliga Forest between Coonabarabran and Narrabri.