Australia Day heatwave pushes temperatures above 40C

Temperatures are soaring into the 40s across large swathes of the country with a scorching hot Australia Day forecast.

Australia has sweltered through a heatwave for the past week that will in many areas including Sydney peak on Tuesday just as the barbeques are firing up.

Inland area reached as high as 45C with more of the same forecast, and the outer suburbs of major cities exceeded 40C. 

Southern NSW will enjoy relief on Australia Day tomorrow, while Sydney will cool down on Tuesday night. Pictured: Bondi Beach on Monday January 25

Southern NSW will enjoy relief on Australia Day tomorrow, while Sydney will cool down on Tuesday night. Pictured: Bondi Beach on Monday January 25

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Overnight temperatures in Sydney on Monday would remain high, approaching 30C

Overnight temperatures in Sydney on Monday would remain high, approaching 30C

Temperatures are soaring into the 40s across large swathes of Australia's southeast, providing fire authorities with their first major test this summer

Temperatures are soaring into the 40s across large swathes of Australia's southeast, providing fire authorities with their first major test this summer

Bureau of Meteorology NSW manager Agata Imielska said Australia Day temperatures in western Sydney would top 40C but coastal areas would benefit from a sea breeze, reaching about 35C.

Overnight temperatures on Monday would remain high, approaching 30C. But heat records are unlikely to tumble this week.

'Tomorrow we will see a change move across NSW, starting across the south, bringing cloud and rain in the morning to southern areas, so we will see cooler temperatures,' Ms Imielska told reporters on Monday. 

BoM senior meteorologist Gabrielle Woodhouse said people across SA, Victoria and NSW were unlikely to sleep easy.

'The important part with the heat we're seeing is those overnight temperatures remaining particularly warm,' she told reporters.

Total fire bans are in place on Monday across the three NSW Riverina districts and in six Victorian districts. Pictured: Bondi Beach on Monday

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Total fire bans are in place on Monday across the three NSW Riverina districts and in six Victorian districts. Pictured: Bondi Beach on Monday

A cool change is expected to move east across Victoria on Monday afternoon, dropping temperatures by 10 to 15C within an hour. Pictured: Port Melbourne beach on Monday

A cool change is expected to move east across Victoria on Monday afternoon, dropping temperatures by 10 to 15C within an hour. Pictured: Port Melbourne beach on Monday

'Over parts of the southern inland in particular, we're looking at (overnight) temperatures anywhere in the high 20s, even touching 30C... so very warm.'

Ms Woodhouse added that the heat - including overnight temperatures - was unlikely to subside in NSW until Tuesday night or Wednesday morning.

On Australia Day on Tuesday, temperatures would fall to between 38C and 41C in western Sydney and around 32C in the city due to a sea breeze. 

Canberra is also forecast to swelter, reaching the mid-30s before an evening shower.

'What we're seeing with this heatwave is multiple days of those really high maximum and minimum temperatures which can be quite difficult to manage when we haven't had a history of that this summer,' Ms Woodhouse said.

The heatwave is also giving firefighters their first major test this summer with several blazes burning around the country.

Total fire bans are in place on Monday across the three NSW Riverina districts and in six Victorian districts including the Mallee, Wimmera, Northern Country, North East and North Central and East Gippsland.

Two homes are also feared to be either damaged or destroyed by an uncontrolled bushfire in the hills southeast of Adelaide in South Australia.

On Australia Day on Tuesday, temperatures would fall to between 38C and 41C in western Sydney and around 32C in the city due to a sea breeze. Pictured: Bondi Beach on Monday

On Australia Day on Tuesday, temperatures would fall to between 38C and 41C in western Sydney and around 32C in the city due to a sea breeze. Pictured: Bondi Beach on Monday

The Bureau of Meteorology said Australia Day temperatures in western Sydney would top 40C but coastal areas would benefit from a sea breeze, reaching about 35C. Pictured: Bondi Beach on Monday

The Bureau of Meteorology said Australia Day temperatures in western Sydney would top 40C but coastal areas would benefit from a sea breeze, reaching about 35C. Pictured: Bondi Beach on Monday

The next tropical cyclone of the season could hit Northern Australia in coming days as a weather system develops in the Gulf of Carpentaria. Pictured: Bondi Beach on Monday

The next tropical cyclone of the season could hit Northern Australia in coming days as a weather system develops in the Gulf of Carpentaria. Pictured: Bondi Beach on Monday

A cool change is expected to move east across Victoria on Monday afternoon, dropping temperatures by 10 to 15C within an hour and sparing the state a third straight day of sweltering conditions on Tuesday.

BoM forecaster Dean Narramore told reporters temperatures in Melbourne dropped 10 degrees in 10 minutes on Monday, and the weather would remain cool on Australia Day.

'It could be a wet morning for Australia Day through Melbourne, but the rain

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