Sydney will be battered with its heaviest downpour since winter on Sunday night.
Weatherzone meteorologists predicted the New South Wales capital would cop 50mm overnight, with experts saying it could be one of the worst wet seasons on record.
Sydney residents were also warned to brace for thunderstorms and flash flooding on Sunday night.
The Bureau of Meteorology also issued a severe weather warning for residents in Wollongong, Nowra, Bowral, Goulburn and Yass.
Forecasters expected the showers to continue well into Monday.
Sydney residents were also warned to brace for thunderstorms and flash flooding on Sunday night
It’s been a gloomy day in Sydney with clouds on the harbour bridge setting the scene for an expected steady downpour of rain expected to continue until Monday
Severe weather warnings have been issued for Queensland and New South Wales
Meanwhile, torrential rain has brought parts of Canberra to a standstill, with some residents watching on as their homes were inundated with floodwater.
The ACT emergency services agency responded to more than 150 requests for assistance as Canberra was lashed by high winds and heavy rainfall on Saturday and Sunday.
Some parts of Canberra were hit with 60mm of rain within two hours on Sunday, following heavy rain overnight.
More rain is expected for the afternoon as residents battled flooded homes and road closures, including a major highway that allows trucks to bypass the city.
Meanwhile, Queensland was hit by up to 300mm of rain over the course of the weekend.
The State Emergency Service advised people in Queensland to keep clear of creeks and storm drains and refrain from driving, walking or riding through floodwaters.
The bad weather caused havoc at the weekend, with emergency services reporting a number of dramatic rescues.
A social media post showing cloud cover in Brisbane as Queensland continues to get hit with severe weathert
Canberra looked under water in parts as floods hit the nations capital
A 66-year-old man was rescued by helicopter on Saturday after he became lost on a walking track in Gordonvale in southern Cairns.
Two people were rescued at 7pm Friday night after driving their car into floodwaters on Mount Sampson Road in Kobble Creek, north west of Brisbane.
The tourists’ car had swept from a causeway and they were washed 200m downstream.
On Thursday night four people were trapped in two cars in Hervey Bay after trying to cross a flooded creek, while a man was charged after he abandoned a flooded car with two puppies inside. The dogs have since been re-homed.
Queensland State Emergency Services responded to 400 calls for help in the 24-hours up to Saturday.
A man abandoned his flooded car in Archer River Queensland, leaving two puppies in the car. Police charged the man and the puppies reportedly have a new home.
A spokesperson said most of the jobs had been ‘leaking roofs’ and people sandbagging their homes in response to the ‘heavy rain’.
He said about 10 people had been rescued from floodwaters which he said was ‘quite good’ considering it had been ‘fairly widespread’.
Friday’s deluge continued into early Saturday morning, with several areas receiving more than their average monthly rainfall in 24 hours.
Tamborine Mountain received the most rain with more than 200mm in 24 hours, while Park Ridge had 167mm, Nambour 157mm and more than 150mm falling in some Brisbane suburbs.
SEQ Water has advised several dams are spilling and outflows have increased.
A Brisbane resident noted it was ‘raining cats and dogs’
This motorist decided to take the risk and found themselves in a spot of bother
Emergency services have warned motorists in Queensland’s south east are warned to not drive through flooded roads
In the country’s west, a thunderstorm has torn roofs off homes, and caused flash flooding across Perth.
The Department of Fire and Emergency Services attended dozens of call outs of storm damage in Perth’s south, after a severe thunderstorm battered Rockingham.
Weatherzone meteorologists said winds of 130km/h were recorded off the coast, moments before the storm hit the mainland.
Hail and torrential rainfall caused flash flooding on suburban streets in Western Australia’s capital.
The storm was expected to track through Western Australia and into the Great Southern.
A dramatic rescue took place when four people were trapped in cars in Hervey Bay, Queensland
Emergency vehicles coming to the aid of people trapped in flood waters in Queensland as people were rescued from cars
It appears some motorists aren’t getting the message with Queensland Police having to help people get out of trouble near Brisbane
The Bureau of Meteorology forcasted heavy rainfall and possible flash flooding across coastal and adjacent inland areas extending from the Sunshine Coast hinterland down through Brisbane and into the Gold Coast hinterland on Friday night and into Saturday morning.