Sydney and parts of NSW sweated through the hottest November night on record, with no respite likely until late Sunday afternoon.
Sydney has broken the 40-degree barrier and swathes of western NSW, SA and northern Victoria are baking through even higher temperatures.
The toasty conditions from this week are set to continue across the weekend with many areas reaching above 40C.
The weather bureau said the country was in for some "pretty uncomfortable heat" but the maximum temperature raised a few eyebrows on Facebook.
Parts of Sydney hit 13 degrees above average on Monday as NSW, Queensland, Western Australia and Northern Territory all battle heatwaves.
Some areas of Victoria are being warned of a 'high pollen forecast' with the next two weeks 'critical' for hay fever and asthma sufferers.
The firies saved the man's house but apologised for the loss of his shed. The grateful homeowner called the fire crews 'superheroes'.
After some areas were lashed with a months' worth of rain there will be little reprieve for South East Queensland on Wednesday.
Southeast Queensland was hit with a month's rain in the space of one hour, causing flash flooding and major traffic delays.
Thunderstorms will continue to thrash Australia’s east coast this week, bringing 'giant hail and flash flooding'.
The Bureau of Meteorology has called it a 'multi-state thunderstorm outbreak' with days of rain, thunder and humidity.
Many states will see rainfall this weekend, and there's more expected over the coming weeks due to La Nina forming.
We're in for longer, more intense heatwaves and more cyclones, according to the Bureau of Meteorology's long-range forecast.
Heavy rain, thunderstorms and damaging winds will sweep across much of central and southeastern Australia in the coming days.