Potentially damaging wind conditions will hamper much of NSW and the ACT until Tuesday, with the Bureau of Meteorology warning the system has the potential to bring down trees and powerlines.

The NSW State Emergency Service is urging people to clean-up loose items around their properties and reconsider boating or rock fishing.

A cool change is expected with temperatures dropping by up to 10C in some places.

"It is possible that we may see snow in places like Goulburn and parts of the Central Tablelands, parts of the hills in Canberra, and then possibly stretching out to towns such as Armidale and Glen Innes," meteorologist Jackson Browne said on Monday.

"The front is pretty mobile so it blows off the fast northeastern parts of NSW during the course of Wednesday."

But left in its wake will be more strong winds which will develop along much of the coast, whipping up hazardous surf conditions in areas between Sydney and Port Macquarie.

Australian Associated Press