The Bureau of Meteorology (BoM) says the severe weather has eased across NSW, while reports show Sydney experienced one of its wettest Septembers.
BoM stated it has cancelled its severe weather warning for the Mid North Coast, Hunter and Northern Tablelands Forecast Districts.
A coastal hazard warning was also cancelled in the same areas.
However, the bureau's strong wind warning for Sydney Enclosed Waters, Byron Coast, Coffs Coast, Macquarie Coast, Hunter Coast, Sydney Coast, Illawarra Coast, Batemans Coast, and Eden Coast remains in effect.
Weatherzone has reported the total of 122mm of rain in the 24 hours to Thursday 9am, which was the city’s heaviest daily rainfall total for September since 1879.
After three consecutive days of heavy rainfall across the central NSW coast, rainwater flooded homes in inner Sydney and seeped through roofs in Wollongong.
At least two tornadoes were reported across the state, including one captured on camera from a fire tower at Young as it tore through a field in NSW's southwestern slopes region.
The rain continued into Thursday, with Newport on Sydney's Northern Beaches recording 122mm of rain in the day to 9am and Cronulla notching 147mm.
It made this month one of Sydney's wettest Septembers on record.
Multiple severe weather warnings remain in place, including alerts for damaging winds and hazardous surf across NSW.
The State Emergency Service has received more than 850 calls in 24 hours, mostly due to heavy rain.
During 50 minutes on Wednesday, the service received a surge of calls from across Sydney from those stranded in their homes or trapped in vehicles on flooded roads.
A group of hikers was rescued at Wattamolla, south of Sydney, after heavy rainfall hit from 1pm on Wednesday.
