Residents across Australia’s southeast are enduring a sleepless night as a summer heatwave settles in for much of South Australia, NSW and Victoria.
Extreme heat hit South Australia – including Adelaide – along with regional NSW and Victoria on Sunday, with temperatures in some regions climbing into the mid-40s.
In NSW, the mercury soared to 40C in Sydney’s west and 43.8C at Hay in the state’s western Riverina region.
There was expected to be little relief across affected areas into Monday morning, with forecast overnight minimums hovering in the high 20s and even pushing 30C at Mildura in Victoria’s northwest.
Adelaide and Melbourne were headed for forecast lows of 27C, with Sydney tipped to fare slightly better with 21C.
“We’re looking at an oppressive night,” meteorologist Michael Efron told reporters on Sunday.
Victoria, Tasmania, and western and southern parts of NSW are likely see their hottest temperatures of the heatwave on Monday, while the mercury is due to peak on Tuesday for eastern NSW and Greater Sydney.
Bureau of Meteorology senior meteorologist Gabrielle Woodhouse said heat records were unlikely to tumble over the coming days.
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 will rise to between 38C and 41C in western Sydney and hover around 32C in the city due to a sea breeze.
Canberra is also forecast to swelter, reaching the mid-30s before an evening shower.
A cool change is expected to move east across Victoria on Monday afternoon, rapidly dropping temperatures by 10 to 15C.
That change is expected to reach Hobart by midday but not before temperatures rise into the mid-30s across much of Tasmania’s east and south.
Total fire bans have been declared for six districts across Victoria and NSW’s Riverina southern, eastern and northern regions for Monday.