However, parts of the east coast now face a new threat from flooding, Sydney is facing one of its wettest three-day periods in years. Bushfires are an annual problem during the southern summer, but flared far more widely and earlier than usual following months of severe drought and high temperatures linked to climate change.
The flooding in this area is likely to be worse than the 2016 flood disaster.
The Gosper Mountain blaze, north-west of Sydney, had been "too big to put out".
"The strong rains and wind have caused more than 2400 hazards to the electricity network such as fallen power poles, large trees across roads, damaged wires and extensive flash flooding", Ausgrid said.
"We are hoping by the end of the week we may be able to have zero uncontained fires across NSW", he said.More news: Oscars 2020: Renee Zellweger wins Best Actress for ‘Judy’
In contrast, flood evacuation warnings have now been ordered for parts of the Conjola region, authorities said, where deadly fires razed dozens of homes on New Year's Eve. Power is out in thousands of homes and businesses.
Sydney alone was expected to receive as much as 130 millimetres of rain in the 24 hours to Saturday morning, the biggest one-day rainfall since February 5, 2002, data on the bureau's website showed on Friday.
Heavy flooding can carry a huge amount of wreckage.
Phin Ziebell, agribusiness economist at National Australia Bank, said the rain would also encourage farmers in the north-east state of Queensland to rebuild their stock numbers now they had water and feed.
Bush fires have wreaked havoc in New South Wales since September.More news: Backstreet Boys tour coming to Phoenix in October 2020
Bureau of Meteorology duty forecaster Abrar Shabren said Byron Bay received one of the highest rainfalls in the state since 9am on Thursday.
Another positive is that the Warragamba Dam which supplies around 80 percent of Sydney's drinking water has risen from 43 percent capacity to 62 percent. Sydney was forecast to receive around 100 millimeters of rain Sunday, with the deluge expected to continue into Monday.
Australian forest fires that have killed at least 33 and destroyed more than 3,000 homes in an unprecedented burning season that started late in a record dry 2019.
The stormy weather has brought days of chaos and destruction, with one man missing after his auto was swept off a road in Sydney's north and hundreds more rescued from floodwaters across the state.
"We are all very, very happy that you are here today, but also importantly that you're bringing this fine British rain with you", AstraZeneca CEO Pascal Soriot told guests.More news: 3 weather warnings remain as Storm Ciara rages on
But Adam Morgan, a meteorologist at the Bom, said the rainfall totals in those areas were not expected to be "anything near as heavy as what we've seen over the past few days".