In Melbourne, temperatures are expected to hit 37 degrees with winds of up to 55 kilometres per hour.
Two thirds of the state will be under Total Fire Ban restrictions due to the hot, dry and windy conditions forecast.
Meanwhile, the AFL has enacted its extreme heat policy for tomorrow’s match between North Melbourne and West Coast at Marvel Stadium in Melbourne.
In Sydney is expected to reach 30 degrees, with Brisbane slightly warmer at 33 degrees.
If Sydney stays above 30 degrees across the weekend it will have sustained four consecutive days above 30 degrees for the first time in autumn since records began 165 years ago.
Read Related Also: What is the 2023 Chinese New Year animal and what does it mean?
The source of the heat is two separate tongues of hot air that are sweeping east across Australia’s south-east, raising temperatures and keeping the traditional sea breezes at bay.
There are 47 fires burning across NSW, with the previously out of control Curraweela fire now contained.
It burnt 3408 hectares before it was controlled but the Rural Fire Service (RFS).
Record heat in NSW sparks bushfires
Across the country, Adelaide and Perth are both expected to hit 28 degrees, Hobart 25, Canberra 32 and Darwin 33.