Current heatwave conditions are forecast to really be seen on Saturday, which would lead to further records tumbling if predictions are fulfilled.
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The Mudgee Airport and Gulgong Post Office weather stations are expected to peak at 44°C, while Nullo Mountain in the Rylstone/Kandos area could hit 39°C. Before they're tipped to ease by 6-8 degrees on Sunday.
All three locations have already had their the hottest December day on record on Tuesday the 11th; Mudgee 40.4°C; Gulgong 41°C; and Nullo Mountain 34.4°C. Although, those benchmarks will be short-lived if Saturday's forecast comes to pass.
Furthermore, if the Airport Weather Station does hit 44°C it will be the hottest ever day at the location. Currently the record is 43.9°C, set on February 11, 2017, a day that saw the start of the Sir Ivan Fire.
At this stage a "milder" Christmas Day of the mid-30s is likely for the region.
The mass of hot air passing over the state, with the passage of a low pressure trough, that's still hanging around is responsible for the scorching weather. And although there are signs that showers and thunderstorms could also affect parts of eastern Australia on Christmas Day, the location of this activity will depend on the position of the low pressure trough.
A total fire ban is in place across NSW has been in place from midnight on Tuesday until midnight on Saturday as firefighters battle to contain more than 100 fires burning across the state.
The Western NSW Local Health District said people should be cautious during the extreme heatwave conditions that are forecast across the region for the rest of the week.
Heath protection district manager Priscilla Stanley urged people to stay indoors during the heat of the day, minimise physical activity and keep hydrated during the heatwave.
"I'd encourage everyone to take the risk of heat related illness seriously," she said. "We know that conditions like these can cause severe illness, hospital admission and even deaths.
"Heat puts a lot of strain on the body and can cause dehydration, heat stress and heat stroke. It can also make underlying health conditions worse.
"People over 75, people with chronic medical conditions and people who live alone are particularly vulnerable. It's also really important to stay in regular contact with elderly neighbours, friends and relatives because they may be more vulnerable to the heat."
