Firefighters supported by waterbombing aircraft have brought a blaze in the Budderoo National Park near Jamberoo under control overnight.
Strong winds and inaccessible terrain had hampered firefighters' efforts to contain the fire, which began as a hazard reduction burn on Tuesday.
The fire had burned through more than 250 hectares of bushland by this morning.
In an update posted on its website, the Rural Fire Service said the fire was brought under control overnight by about 30 firefighters from the NSW Rural Fire Service and National Parks and Wildlife Service, supported by three aircraft.
''Although no property is under direct threat at this time, people in the Jamberoo, Knights Hill and surrounding areas are asked to remain vigilant as winds become stronger and may change and become variable through the day,'' the update read.
The Bureau of Meteorology says strong winds will buffet the region intermittently until Sunday.
Gusts of more than 100km/h were recorded at Bellambi late Wednesday evening, but winds had calmed to gusts of about 45kh/h by 9.30am.
At the peak of firefighting efforts yesterday, four helicopters, 15 tankers and 90 crew from the RFS and NSW National Parks and Wildlife Service were fighting the blaze.
Jamberoo Mountain Road was closed in both directions for several hours yesterday as a result of the fire.
NSW RFS Illawarra zone Superintendent Richard Cotterill said the bushfire was actually burning in two areas.
One section that began as an NPWS hazard reduction burn had been contained yesterday, but a spot fire that broke out during the burn was still causing concern.
Last night an RFS spokesman said the fire had been mostly contained, but the concern was that strong winds overnight could pick up embers and cause spot-fires.
The Budderoo fire was one of several burning across the state yesterday. Fire crews in Dorian, near Jindabyne, were last night fighting a 200-hectare grass fire, which was threatening property, while a similar-sized fire was burning at Double Tanks near Bourke, in the state's west.
There were also several smaller fires throughout the state. A 10-hectare fire in Warren, north-west of Dubbo, was brought under control late yesterday, as was a scrub fire near Forbes.
The winds caused concerns on the water as well, with Roads and Maritime Services last night issuing an alert for dangerous surf conditions from Port Kembla to Montague Island into toda