Severe weather warning is issued for Sydney as Australia is battered by a ...

Sydneysiders are bracing for wild weather on Monday after New South Wales' south coast was drenched by up to 300mm of rain - forcing residents living in tents in bushfire-affected towns to evacuate.

A severe flood warning is in place for coastal regions of Sydney and the Hunter region with winds expected to exceed 90km/h as a low pressure trough moves northwards through the state. 

Photos of Hurstville in Sydney's south showed cars crushed by falling trees while emergency crews worked through the night to clear the scene.

The NSW State Emergency Service issued three evacuation orders late on Sunday night for the south coast covering nearly a dozen major population centres including Moruya, Nowra and Sussex Inlet. 

Mark Ethell, an evacuated resident from the Moruya Waterfront Hotel, told Channel Nine he was afraid of the impact flooding could have on his community still reeling from the bushfire season. 

'I'm actually concerned for a lot of the people that have been through the fires, the COVID,' he said.

'They're living in tents, they're actually living in caravans right now and a lot of our low-lying areas around town. It's going to be pretty hard.'  

The Shoalhaven River at Nowra - the largest town in the City of Shoalhaven region - is predicted to peak near 4.4m about 1pm on Monday with authorities warning of 'major flooding'. 

About 6pm on Sunday, the body of a missing kayaker was pulled from Murrumbidgee River, south of Canberra, highlighting the dangers of getting caught out during the deluge.  

The man was reported missing about 2pm after he was separated from his kayaking group amid rising river levels, torrential rain and increasingly difficult conditions. His kayak reportedly got caught under a bridge.     

A car is pictured crushed by a fallen tree in Hurstville in Sydney's south. A severe flood warning is also in place for coastal regions of the Harbour City as a trough which has already dumped 300mm of rain on parts of the south coast moves northwards

A car is pictured crushed by a fallen tree in Hurstville in Sydney's south. A severe flood warning is also in place for coastal regions of the Harbour City as a trough which has already dumped 300mm of rain on parts of the south coast moves northwards

New South Wales State Emergency Service workers cut up parts of a tree which fell on a ute in Hurstville. Winds exceeding 90km/h expected as a trough moves northwards through the state

New South Wales State Emergency Service workers cut up parts of a tree which fell on a ute in Hurstville. Winds exceeding 90km/h expected as a trough moves northwards through the state

Wild weather in Kogarah, in southern Sydney, tore a tree out of the ground and left it lying across the roof of a suburban home

Wild weather in Kogarah, in southern Sydney, tore a tree out of the ground and left it lying across the roof of a suburban home

Pictured is the damaging weather system in satellite imagery shared by the Bureau of Meteorology moving north on Sunday evening

Pictured is the damaging weather system in satellite imagery shared by the Bureau of Meteorology moving north on Sunday evening

Cars were caught in rising waters in Canberra on Sunday (pictured). The SES has told residents in Queanbeyan in the Australian capital's eastern fringe the surging flood waters should not be considered a 'tourist attraction'

Cars were caught in rising waters in Canberra on Sunday (pictured). The SES has told residents in Queanbeyan in the Australian capital's eastern fringe the surging flood waters should not be considered a 'tourist attraction'

Mudslides filled with bushfire debris from the catastrophic blazes of the summer are also a cause for concern. 

Residents have reported flash flooding, particularly along the Deua River, which peaked at eight metres on Sunday afternoon, and authorities are warning Monday's deluge could be even more catastrophic.  

People in low lying areas of Sussex Inlet were told to evacuate with flood levels expected to damage properties.  

The SES has received more than 1,000 calls for help as of Monday morning. 

Most of the calls came from within Greater Sydney - many of which were related to falling trees crushing roofs, blocking roads and leaving Bankstown, Padstow and Revesby residents without electricity for several hours before emergency crews restored power.  

The torrential downpour has left waterfront homes in Wamberal, about 100 kilometres north of Sydney, facing collapse after a weekend of heavy surf.

Pictured: Rescue crews saving two horses amid rising flood levels in Canberra, as a kayaker's body is pulled from a stream

Pictured: Rescue crews saving two horses amid rising flood levels in Canberra, as a kayaker's body is pulled from a stream

A catchment area in ACT was overflowing at the weekend as torrential rain lashed the territory, causing flash flooding

A catchment area in ACT was overflowing at the weekend as torrential rain lashed the territory, causing flash flooding

Up to 200mm of rain fell on the burnt-out town of Moruya on the south coast of NSW on Sunday as residents in low lying areas were urged to evacuate and seek higher ground

Up to 200mm of rain fell on the burnt-out town of Moruya on the south coast of NSW on Sunday as residents in low lying areas were urged to evacuate and seek higher ground

Canberra suffered extreme and torrential rain on Sunday. Pictured: A car is pictured submerged in the rising floodwaters

Canberra suffered extreme and torrential rain on Sunday. Pictured: A car is pictured submerged in the rising floodwaters

Meanwhile, waterfront homes in Wamberal, north of Sydney, have been hit by major erosion after a weekend of wild weather

Meanwhile, waterfront homes in Wamberal, north of Sydney, have been hit by major erosion after a weekend of wild weather

NSW Transport Minister and Bega MP Andrew Constance said the heavy rain was the latest challenge to face the region after bushfires ravaged the state's south coast last summer.

'There was 260mm of rain in some areas over the past three days... It has caused extensive damage, a lot of infrastructure takes a lot of battering,' he told 2GB's Ben Fordham. 

Sussex Inlet was forecast to rise to 1.2m with the high tide on Sunday night and the nearby river at Island Point Road expected to peak around 1.3m later on Sunday, causing minor flooding.

Torrential rain has pummeled the south coast of New South Wales in particular, but also in Perth - where the downpour has been accompanied by powerful winds (pictured)

Torrential rain has pummeled the south coast of New South Wales in particular, but also in Perth - where the downpour has been accompanied by powerful winds (pictured)

Cars were struggling to make it through flood waters on Sunday following torrential rain

Cars were struggling to make it through flood waters on Sunday following torrential rain

Man running in the rain

Person walking with an umbrella

People made a mad dash in the rain on Sunday night, carrying umbrellas

Roads were inundated with water both in NSW and ACT (pictured). SES warned residents who chose to remain in their properties that they may get stuck

Roads were inundated with water both in NSW and ACT (pictured). SES warned residents who chose to remain in their properties that they may get stuck

People who can't stay with family and friends have been advised to go to the Sussex Inlet Police Station to register for emergency accommodation.  

Anyone who chooses to stay behind after the evacuation orders were put in place faces being stranded, with authorities warning they may not be able to rescue all those who are trapped.

Similar warnings were distributed during the fire season, when the NSW Rural Fire Service warned they simply didn't have the

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