The New South Wales Rural Fire Service said it was concerned that flying embers could spark new blazes ahead of the advancing fire front.
The fire continues to burn in an easterly direction towards Barden Ridge, but the threat has been reduced.
The RFS is now advising residents in Pleasure Point, Sandy Point, Alfords Point, Barden Ridge, Voyager Point, Illawong, Menai & Bangor to "remain vigilant throughout the day and keep themselves up to date by checking the NSW RFS website".
Residents in the suburbs of Voyager Point, Pleasure Point, Sandy Point and Illawong, Menai and Bangor were warned of the danger of ember attacks as many scrambled with hoses and buckets to protect their houses.
The blaze was downgraded from watch-and-act to advice about 2am on Monday.
There's also a risk that winds could also pick up to 35km/h later today.
By 5pm, some Menai residents were starting to relax.
Morrison said there were still about 100 firefighters responding to the inferno, which they were finally bringing under control.
"So I'm sure everyone's been out checking their roof, making sure everything's wetted down and keep an eye on those spot fires".
The fire began on Saturday afternoon in Casula and quickly spread to the Holsworthy area, with threat levels reaching "emergency" and forcing residents to evacuate.
Police are investigating whether the fire was deliberately lit. (9NEWS) More than 500 firefighters have worked to contain the blaze over the weekend.
Conditions are expected to aid the firefighting effort on Monday, with winds about half the strength they were on Sunday.
He said the aircraft had unfortunately already been returned to the United States because they were always sent back by the end of March when temperatures were traditionally cooler.
"As we say all the time, no one tolerates this in the community".
A spokeswoman for Mr Constance said the minister had asked the Secretary of Transport for NSW to refer the operation of the train to the Office of Transport Safety Investigations for review.
The RFS said there was very little rain forecast over the next few days across the fire ground and most parts of the state.
Authorities believe there is no obvious natural cause for the fire and have labelled it as suspicious.