Total fire bans have been issued for more than half of NSW, including the Greater Sydney region, by the Rural Fire Service, with hot and windy conditions set to create dangerous conditions.
Eleven of 21 regions will have severe fire conditions on Sunday, RFS spokesman Greg Allan told AAP on Saturday.
Sydney's west will swelter with Penrith set to reach 41 degrees Celsius.
"It's going to be very hot and windy," Mr Allan said.
"It's been so hot for so long that the recent rain hasn't really soaked the ground," he said.
The entire southeast corner of the state is in total fire ban, taking in the Greater Hunter, the Illawarra down to the Far South Coast.
The mercury is set to reach 40C in most of the Hunter region.
In the west, the Lower Central West Plains and Eastern Riverina have total fire bans with temperatures in the high 30s.
While the North Western region that borders Queensland has also been declared to be under a total fire ban.
Temperatures across the state in the mid to high 30s combined with winds between 30-60km/h will keep emergency workers on standby.
"Also being a weekend means people may be out and about and need to remain alert to the dangers of bushfires," Mr Allan said.
He reminded NSW residents that the official bushfire danger period was not over yet.
While it may be autumn the bushfire season doesn't end until March 31.
"We need people to remain vigilant," Mr Allan said.
"Call Triple-zero as soon as you see smoke."
A cool change is not expected until Sunday night, according to the Bureau of Meteorology.
The coolest place in the state on Sunday is at Thredbo Top Station with 18C.
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