After a blustery night that saw a series of massive infernos in New South Wales and Victoria states merge into a mega-blaze four times the size of Greater London, temperatures dropped and rain fell on fire-scarred regions.
"Whilst it was a very long and -- in parts of New South Wales -- difficult night, we're relieved this morning that no lives have been lost and no substantial property damage," New South Wales Premier Gladys Berejiklian told reporters on Saturday.
The milder conditions are expected to last around a week, giving firefighters time to try to get the fires under control.
New South Wales Rural Fire Service commissioner Shane Fitzsimmons described the conditions as the "best seven days we have had without a rise of very dangerous fire ratings".
In a matter of months, the catastrophic bushfires have killed at least 26 people, destroyed more than 2,000 homes and scorched some ten million hectares (100,000 square kilometres) -- an area larger than South Korea or Portugal.
University researchers estimate that more than one billion mammals, birds and reptiles have been killed in the blazes.
Despite the cool change, authorities warned that the bushfire season is not yet over, with hundreds of fires across several states still raging.
In Victoria State, Premier Daniel Andrews called on communities to remain vigilant and warned that the months-long crisis was "a long way from over".
The head of a firefighting "strike team" in the New South Wales village of Towamba, Nathan Barnden, told AFP the rainfall was "fantastic" but "not enough at this stage to put these fires out".
"We're going to need hundreds of millimeters over a period of time to... make firefighting easier for us," he said.