Firefighters have been working around the clock since last week to get dozens of bushfires under control.
Three people have died and more than 150 homes have been lost as the infernos continue to rage across New South Wales and Queensland.
However, residents have been told that the worst is yet to come and to be more vigilant than ever.
Anthony Clark from the RFS said: "There's a lot of hard work ahead of us, but the simple message is we're not going to get on top of those fires before these really bad conditions hit on Tuesday."
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Forecasters are expecting 'catastrophic conditions' for the Greater Sydney, Blue Mountains, Central Coast and Greater Hunter areas tomorrow. Temperatures are tipped to get into the mid-30s and wind is forecast to be high - which, teamed with the already extremely dry conditions, is the perfect storm for bushfires.
But it's not just New South Wales and Queensland that are being hit with rough conditions.
Meteorologist Ben Domensino told news.com.au: "It is elevating fire danger ratings in South Australia and parts of Victoria today on Monday, then on Tuesday, the threat will shift and focus into NSW and Wednesday, it pushes further north.
"So that's why we're seeing these danger ratings in South Australia elevated fire danger ratings across multiple states on multiple days.
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"We have known this has been coming for months because we've had this dry weather leading up to the hottest time of year.
"Now we're seeing the winds increasing, the temperatures increasing, which are typical of this time of year. But we don't normally have this much fuel.
"We are seeing all of those conditions combined to create the perfect conditions for catastrophic fire danger ratings which is the highest rating on that scale and the first time it has been issued for Sydney."
Prime Minister Scott Morrison spent the weekend touring some of the worst hit regions.
While he chatted with firefighters and residents affected by the situation, he's been criticised for not discussing the issue of climate change during a press conference.
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When asked whether he thought the two were linked, the Prime Minister responded with: "My only thoughts today are with those who have lost their lives and their families.
"The firefighters who are fighting the fires, the response effort that has to be delivered and how the Commonwealth has to responded in supporting those efforts."
Featured Image Credit: Channel 7