A total fire ban has been issued for the greater Sydney region after the city sweated through its hottest day in almost 80 years.
Penrith, in the city's west, exceeded 47 degrees Celsius on Sunday afternoon but conditions across the city cooled slightly on Monday morning with some early rainfall.
Temperatures in the city on Monday will sit in the mid 30s but the mercury in the city's west will hit the 40s, according to the weather bureau.
Rural Fire Service (RFS) spokesman James Morris has warned the public against becoming complacent about the risk of fires.
More than 50 new fires were sparked on Sunday, with 21 blazes continuing to burn into Monday, according to the RFS, and a severe fire danger rating was issued for the Hunter region.
As temperatures soared across the state, thousands of people were left without power, according to electricity provider Ausgrid.
Power outages across the NSW Central Coast affected more than 4,000 properties, while almost 3,000 properties were left without power throughout Sydney.
An Ausgrid spokeswoman said while additional load on the network from the high temperatures had contributed to some of the outages, there were several other factors at play.
