The blaze throughout 300,000 hectares (1,150 sq m) is simply an hour's drive from the nation's most-populous metropolis.
People who can not defend their property from approaching fires have been told they should leave immediately. Around 1000 homes have been damaged or destroyed by fire this season.
Fires have additionally raged throughout Queensland, Victoria, South Australia, Western Australia and Tasmania.
What's the latest on the ground?
Sydney is the capital city in New South Wales state.
At one point on Friday, nine fires had been raised to emergency level warnings, although these had decreased markedly amid a brief respite in conditions later in the day.
The north Sydney blaze was sending black fumes throughout town, inflicting an increase in medical issues.
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The New South Wales Rural Fire Service (RFS) said in a tweet that "a number of fires in the Hawkesbury, Hunter and Central Coast areas have now joined".
Video footage from the Orangeville space confirmed firefighters operating from a wall of fireplace and the Walkabout Wildlife Park has evacuated a whole lot of animals.
"The massive NSW fires are in some cases just too big to put out at the moment", the Bureau of Meteorology said on social media.
There seems to be little respite. Temperatures are forecast to reach 39C in Brisbane on Saturday, and above 40C inland, in Gatton and Ipswich.
Some firefighters have expressed concern that volunteer numbers might not be enough and that there are inadequate water supplies.
One mentioned the fires had been "all ticking time-bombs - with out rain these fires will not be put out".
In addition, NSW RFS Commissioner Shane Fitzsimmons said that low rainfall and higher-than-average temperatures could result in fires ravaging the country for weeks or even months.
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It hasn't come near the fatalities of 2009, when nearly 200 folks died, however the scale of the injury has been big.
Greater than 1.6 million hectares of land have burned in New South Wales alone.
The season has hit earlier than normal and has been exacerbated by drought conditions.
"They have the potential or are expected to spread further east, which unfortunately is getting into more populated areas, villages, communities, isolated rural areas, and other farming practices and businesses throughout the region", Fitzsimmons told reporters in Sydney.
Is climate change to blame?
The BOM says that local weather change has led to a rise in excessive warmth occasions and raised the severity of different pure disasters, akin to drought.
Last week, the bureau noted that NSW had endured its driest spring season on record. It additionally warned that Australia's coming summer season was predicted to deliver comparable circumstances to final yr's - the nation's hottest summer season on report.
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The government has been criticised over its efforts to address climate change.