The floods resulted in major highways being closed in Queensland and at least 50 homes in Brisbane have been reported flooded. A wildlife park home to threatened koalas has also been hit by the rainfall.
According to The Independent, Australia's Bureau of Meteorology Forecaster Kimba Wong, said in some areas 300 millimeters of rain had fallen in just a couple of hours.
She said: "The highest total that we have recorded is 330 millimeters at Loder Creek on the Gold Coast, so some very heavy rainfall there.
"We did have an emergency warning for that rainfall because we had some reports of flash flooding in some locations and in some locations it was a one-in-100-year event."
'Relief is here'
The floods have allegedly 'doused' some the fires, which have destroyed more than 2,000 homes, and burned more than 30,000 square miles, across the states of New South Wales and Victoria
"Relief is here for a number of firefighters working across NSW. Although this rain won't extinguish all fires, it will certainly go a long way towards containment," the New South Wales Rural Fire Service tweeted.