An elderly man was trapped inside his Oatley house when a huge tree was uprooted and crashed on to it during last night's fierce winds.
SES crews in St George and Sutherland Shire attended dozens of calls during the wild weather.
John Rodger, deputy commander of Kogarah SES, said, "We were at at Rockdale about 8pm when we received a report a large tree on the council strip had fallen on to a house and a person was inside," he said.
"The resident of the house in Hurstville Road was an elderly Asian gentleman, whose first language was not English, which made communication a bit difficult.
"We told him there was structural damage to the building and he could not stay in it. We finally persuaded him to come out.
"We contacted his son, who came over and translated and took care of his father. We assisted in getting some gear together for him to take.
"Ausgrid came out and did some work on the power lines and we also called Sydney Water because a water main was broken when the tree fell.'
Deputy Commander Rodger said there had been a lull in the wind before 8pm, "but then everything went bang, and it was very strong for about half an hour".
"Another tree on the media strip in the parallel street, Woonoona Road East, also came down."
SES crews in St George and Sutherland Shire have been busy attending to damage caused by fierce winds overnight.
Trees have been brought down, including one which fell on to overhead wires at Caringbah, causing trains to be suspended between Sutherland and Cronulla for several hours.
Some passengers were stranded on trains between stations.
Services resumed for the morning peak but flow-on delays of about 15 minutes were expected.
A huge tree fell on to a house at Oatley and a crane will be needed to remove it.
NSW SES Kogarah Unit responded to this incident, and reported requests for assistance in many locations.
At Woronora Caravan Park, a van was flipped on to its end by an uprooted tree.
The Bureau of Meteorology reported wind gusts of up to 78km/h at Sydney Airport and 72km/h at Kurnell.
Last night, the bureau issued a Severe Weather Warning for damaging winds and damaging surf for large parts of coastal NSW, including Sydney.
Waves of more than five metres are expected, with the likelihood of significant beach erosion.
Sydney is expected to be windy and wet again on Monday.
The forecast is for up to 10 millimetres of rain, southerly winds up to 45km/h and a maximum temperature of 15 degrees.
The rain is expected to clear during the week, with Thursday tipped to reach 22C ahead of a wet weekend with up to 25 millimetres of rain on Saturday and up to 15 millimetres on Sunday.
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A severe weather warning has been issued for large parts of coastal NSW - including metropolitan Sydney - as heavy rain and wild winds lash the state, forcing some South Coast communities to evacuate.
On Sunday night the Bureau of Meteorology warned of damaging winds gusting up to 90km/h along coastal areas between the Hunter and the Illawarra overnight stretching into Monday.
Heavy rain will continue north towards the Mid North Coast on Monday.
Damaging surf conditions are also expected with large waves exceeding five metres to batter the coastline, with a warning the swell could lead to significant beach erosion along parts of the Sydney metropolitan, Illawarra, Central Coast and South Coast regions.
Meanwhile, Sydney is expected to be windy and wet again on Monday after a soggy weekend.
On Monday the bureau expects up to 10 millimetres and southerly winds up to 45km/h. The forecast top is a chilly 15 degrees.
The rain will clear during the week with Thursday tipped to reach a sunny 22 degrees, before another wet weekend with up to 25 millimetres of rain on Saturday and up to 15 millimetres on Sunday.
FRNSW Flood Rescue strike teams have been deployed over past two days to the south coast NSW to support NSW SES for flood rescues.
Hurstville's Rescue Pump is working around the Oallen Ford area where there head been significant rainfall.