The SES has dealt with 2500 calls for help and 25 flood rescues from cars.
A house on Sydney's Northern Beaches was almost destroyed by a landslide after severe storms ripped through the city last night and this morning.
The house, which is on a hill near Great Mackerel Beach, was almost taken out completely after heavy rain caused the earth above it to give way.
The debris, a mound of mud, soil and trees, stopped just short of collecting the house.
READ MORE: Boy, 17, critically injured after car rolls near Bendigo
One woman was treated by paramedics.
Several warnings are still in place for parts of Sydney as the city deals with flash flooding caused by a deluge of rain this weekend.
The SES has dealt with 2500 calls for help and 25 flood rescues from cars.
Around 3000 people are without power according to Ausgrid.
An early morning storm, moving westward from the coastline, swept over the city's south and west at around 5.30am, with south-west Sydney and the Blue Mountains being hit hard.
About 68mm of rain was recorded at Liverpool in the Georges River from midnight to 5.15am, with Peakhurst copping a drenching of 44mm of rain in just one hour between 3.30 and 4.30am, according to the Bureau of Meteorology.
READ MORE: Man seriously injured after late night shooting in Sydney
The Northern Beaches were issued with several evacuation notices late last night.
Residents in the Narrabeen Lagoon area were urged to leave just before 11pm due to localised flooding.
An emergency warning was in place until early this morning, with the threat level now downgraded to Watch and Act, whilst some residents are being told they can return to their homes.
The Manly branch of the SES shared a photo showing Golf Parade in Manly completely submerged about 7am.
READ MORE: Flight turns back twice, passenger misses best mates' wedding in QantasLink nightmare
The SES has reported making dozens of rescues in the past 24 hours, with State Duty Commander Sonya Oyston urged drivers to take extreme care on roads around the state today due to the already wet weather and risk of flash flooding.
"There has been a lot of flash flooding which has closed roads, and we anticipate some may remain closed for some time," she said.
"We're asking the community to remain patient, and make safe, sensible decisions to never drive into flooded roads."
READ MORE: Brewery owner Jaz had a risky idea. It has paid off big time
The wet weather has hit large parts of coastal NSW, continuing from yesterday's wet and windy day.
People in areas that may be impacted by floods are being urged to avoid creeks and storm drains, and to not drive through flood water in any circumstances.
Storms stretched across Sydney and the surrounding areas yesterday, with the Central Coast and Wollongong being lashed with hundreds of millimetres of rain in the last 48 hours.
READ MORE: Flash flooding leaves trail of destruction in Victorian communities
A woman was killed in the Southern Highlands yesterday afternoon when the car she was travelling in was struck by a tree branch.
A house in Mona Vale narrowly avoided being crushed by a tree, which landed instead on the driveway of the home.
Road closures, transport chaos around Sydney
The weather has also wreaked havoc with the state's roads and transport, though these are beginning to ease.
Trains are now running between Hornsby and Gosford after earlier bus replacements du to floods.
Buses briefly replaced light rail services on the L3 Line between Moore Park and Kingsford due to flooding at ES Marks in the Eastern Suburb., but the line has now reopened after floodwaters subsided.
Several roads remain closed across Sydney, including Wakehurst Parkway between North Narrabeen and Oxford Falls and Oxford Falls Road between Wakehurst Parkway and Aroona Road.
DOWNLOAD THE 9NEWS APP: Stay across all the latest in breaking news, sport, politics and the weather via our news app and get notifications sent straight to your smartphone. Available on the Apple App Store and Google Play.
Third shark attack in Sydney in two days
Police 'traumatised' after woman, 19, found dead and surrounded by dingoes
Father of brave cancer fighter attacked by fox north of Melbourne
Labor figure dies in hospital weeks after alleged assault outside Perth nightclub
Safety plea after three cliff rescues across Victoria in as many days
Parts of outback WA could hit 50 degrees as temperatures surge
Australian billionaires' wealth rose by $600k per day in 2025: new report
Emotional scenes as parliament honours Bondi terror victims
Jarren is hailed the 'Indigenous Steve Irwin', but the issue is he is not real
'Anarchy': Call for action over e-bike gangs
Crowds turned away as Sydney's $830 million fish market finally opens
Iran's leader admits thousands dead after protests, but calls Trump a 'criminal'
'People have no idea': Hidden sinkhole problem in suburban Australia
Dashcam captures lightning strike metres away
