Australia is experiencing persistent heat across the continent, with temperatures from October 2012 to September 1.25 degrees above the long-term average.
Since 1910, average temperatures have risen by 0.9C, with a significant increase in the frequency of hot days.
The Climate Council said a 0.9C temperature rise may not seem like much but even small increases could exacerbate the intensity of extreme weather experienced in Australia.
The latest assessment by the UN's Intergovernmental Panel on Climate Change concluded global warming was driving the frequency and intensity of extremely hot days and heatwaves.
Steffen said Australia was no stranger to baking days but climate change threatened to make extreme heat a much more common and - in the case of bushfires - dangerous occurrence.
The Climate Council was formed after the government abolished the Climate Commission in mid-September.
- AAP