Howling winds overnight will lead to extensive clean-up work today in NSW's south-east and parts of Victoria, with October heat records also broken in Western Sydney.

Intelligence and warnings officer at the NSW State Emergency Service, Adam Williams, said damaging winds had led to a large amount of fallen trees, branches and roof damage.

Since midday Wednesday over 250 calls were made for assistance regarding storm damage in NSW, particularly in the Greater Sydney area, with Sutherland, Hornsby and Parramatta the busiest SES units.

"Conditions have now eased with the severe weather warning now cancelled, but SES volunteers are out today to clean up their communities,"

Mr Williams said.

"If you see any downed powerlines stay well clear."

Senior meteorologist at the Bureau of Meteorol

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