Severe winds that hammered parts of NSW have eased, but thousands remain without power as the clean-up begins.
As a cold front moved across the state on Monday, gale force winds of up to 100km/h blew trees over and damaged roofs on about 100 houses, mainly in Sydney's south and west.
The powerful gusts eased in Sydney on Monday afternoon but a severe weather warning remains in place for the ACT and alpine regions, a Bureau of Meteorology spokesman told AAP.
"It will remain fairly fresh (on Tuesday) ... but not likely to reach the sorts of levels we saw (on Monday)," he added.
Strong westerly winds are predicted to return later in the week and through the weekend but temperatures should stay about average.
About 13,000 homes and businesses remained without power on Monday evening.
A spokesman for Endeavour Energy said about 6,000 homes in southwest of Sydney had lost electricity while about 2,300 were affected in the city's south and west.
Crews are also working to reconnect about 600 properties in the Hawkesbury, he told AAP.
About 3,000 homes and business in Sydney and the Central Coast have also lost power, an Ausgrid spokeswoman said.
The SES has attended to 637 calls for assistance, 433 of which are for fallen trees.
About 100 homes have damaged roofs, predominantly in the south and west of Sydney, a spokeswoman said.
More calls for help are expected as people return home from work, she added.
Paramedics in Sydney and the Illawarra region responded to several calls for help as a result of the strong winds.
A Punchbowl woman had a lucky escape after being left with only a small cut to her head after she was hit by a falling tree.
She was taken to Bankstown Hospital in a stable condition.
The Westpac Life Saver helicopter was sent on five search and rescue missions over 90 minutes during the afternoon.
Four boats were overturned due to the strong winds, three in waters around Sydney's south and the other near Jervis Bay.
Authorities have warned people to stay away from coastal waters.
A man was treated for hypothermia by paramedics after his canoe overturned on Lake Illawarra.
And a kayaker who fell into the water near Avoca Beach clung to a buoy until lifesavers rescued him.
Trains services were delayed and several roads were closed earlier on Monday but most have since reopened.
Citybound train services resumed between Glenfield and Revesby after a fallen tree on the tracks at Panania forced the partial closure of the Airport and East Hills line.
