Residents in the area are advised to follow their bushfire survival plan, and Insp Shepherd said if anyone is planning on relocating to do so before any fire reaches their property.
The fire has burnt more than 247 acres and is being fanned by strong winds up to 68 miles per hour.
More than 800 firefighters were battling more than 80 fires across the state, with 50 of those not contained.
Police are reminding members of the public to check with the NSW Rural Fire Service before lighting fires as Total Fire Bans may be in place.
Five major fires on the south coast and to the north were still out of control on Friday evening.
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The fire near Nowra destroyed outbuildings and forced homes to be evacuated, but that threat had now eased.
Most of the large firefighting aircraft don't typically arrive in Australia until after September, and demand for their services is likely to remain high in Europe and North America amid record summer heat in many regions.
The RFS was expecting weather conditions across Sydney and the southern parts of the state to be cooler and less windy on Thursday, with temperatures to reach a high of 21 degrees in the city and 19 in Wollongong.
Conditions are deteriorating with stronger than expected winds..
"We're definitely not out of the woods yet but we're getting there", he said. "It's worrying, it's mind-bending".
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Firefighters are working to slow the bushfire's spread and establish containment lines, according to the RFS.
Two other fires - in Budawang National Park near Ulladulla and Nowra - also contributed to a hectic day for crews.
Proactive fire prevention had suffered a lack of government funding, the La Trobe University researcher said.
"We are concerned about a return to these gusty conditions on Saturday", he said.
"Don't be the fire risk to your community, know your obligations if conducting burns and know the costs if you do the wrong thing", Mr Fitzsimmons said.
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"It will take a lot of rainfall to make up for that moisture deficit", he said, adding that without a decent spring rainfall we would be "entering uncharted territory".
Commissioner Shane Fitzsimmons said the activity was extremely concerning.
"It is a really early start to these severe fires, and it's only really been three months since the last serious fire we had, which was in April".
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