Several major bushfires have been extinguished by the deluge, including a "mega-blaze" that burned through 500,000 hectares (1.2 million acres) north of Sydney and a similar-sized fire to the city's south, bringing relief to residents and firefighters.
Torrential rain across Australia's east could extinguish all remaining bushfires in the country's most populous state by the end of the week, authorities said on Tuesday, raising hopes a deadly national crisis is nearly over.
Emergency response services in NSW said they had received about 10,000 calls across the state on Monday.
There are still 31 fires burning in New South Wales, but none are considered an immediate danger at present.
The Gosper Mountain blaze, north-west of Sydney, had been "too big to put out".
Conditions remain serious, with more rain forecast and the risk of rivers peaking still high.
On Monday, the Bureau of Meteorology said that in the last four days, 391.6 mm of rain have fallen in the city, the most since February 1990 when 414.2 mm of rainfall were recorded, and warned of more rainfall in coming days, reports Efe news.
After a day of wintry precipitation Thursday, Greater Boston will get hit with rain and some high winds Friday and Western Massachusetts could get a few more flakes before all is said and done. Water could be drawn from deeper in the dam or from elsewhere in the network if there were quality concerns. The horrific extended bushfire season has followed a three-year drought across the country.
"This wet and windy weather is really wreaking havoc on our roads today, with paramedics responding to five vehicle accidents every hour since Friday night", NSW Ambulance spokesman Giles Buchanan said on Sunday afternoon.
The Conjola community, on NSW's south coast, has been told to evacuate while dozens of towns sitting in low-lying areas are advised to watch emergency service alerts. "We expect rainfall to continue to fall across a lot of these firegrounds and that will result in a number of those being declared contained and hopefully we will be confident we won't see new ignitions from anywhere in those firegrounds", he said.
But experts say it will take some time yet to know to what extent the rainfall has replenished dried-up rivers and quenched parched soil in some inland areas most affected by the 3-year drought.
More than 38,000 are facing the possibility of a month without power after extreme rain and winds smashed the NSW coast over the weekend.
"Some of the driest parts of Queensland have received a drenching, which will help pasture growth", he said.