A total state wide fire ban has been put in place as NSW braces for a scorching day, reports Nine News.
In Sydney the mercury is expected to reach 37 degrees by midday, while parts of north-western NSW are expected to exceed 40 degrees by 11h00.
Hot dry winds are also expected for much of the state, prompting concerns from the Rural Fire Service that dust storms may become an issue later in the day.
Authorities are concerned that lightning strikes, combined with a humidity level below 20 percent, provide the most dangerous conditions for bushfires.
The fire danger for the Hunter, Sydney basin, Illawarra, South Coast and the ACT has been upgraded to severe.
Travellers are advised that all fire permits are suspended and lit cigarette butts should not be thrown on the ground. Travellers are not allowed to make fires out in the open and any unattended fires should be reported to triple zero (000).