Record-breaking heatwave wreaks havoc on Australia’s southeast

Southeastern Australia is set to sizzle for another day as a record-breaking autumn heatwave rolls on.

Melbourne is expected to bake on Monday, with the Bureau of Meteorology forecasting a top of 37C after a low of 24C.

Hot weather is predicted across most of Victoria, with temperatures in the mid to high 30s likely.

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An extreme fire danger rating is in place for the southwest region of Victoria, with emergency crews on high alert.

Adelaide is also sweltering, with the South Australian capital tipped to peak at 38C after an uncomfortable overnight minimum of 27C.

Hot conditions in the high 30s and low 40s are forecast for most regional areas in SA, with a total fire ban widely declared.

The bureau warns the conditions will persist in parts of SA, Victoria, NSW and Tasmania until Wednesday.

The temperature peaked at 36.9C in Melbourne late on Sunday, with Avalon recording 40C and Geelong 39.6C.

It followed a record-breaking Saturday night in the Victorian capital, with the mercury hovering about 30C until Sunday morning, when it dropped to 27.3C.

That toppled the previous March record-high minimum temperature of 26.5C in 2013.

Hobart was also stifling on Saturday night, with a minimum 24C, well above the previous March record of 21.1C.

Adelaide recorded a top of 38.8C on Sunday as the mercury soared into the high 30s and 40s across most of the state.

The warmer weather, roughly 10 to 15 degrees higher than average, is being caused by a high-pressure system in the Tasman Sea that directs hot northerly winds over south-eastern Australia.

Extreme heat will continue to wreak havoc on Australia’s southeast. Credit: AAP

The weather bureau says those “blocking high-pressure systems” also prevent cold fronts being able to sweep across the southern parts of the country and flush away the heat.

“A southerly change is expected to move through early on Tuesday, giving the southern states some reprieve but it won’t be until Wednesday or Thursday that a colder air mass will push in and bring those temperatures down,” senior meteorologist Sarah Scully told ABC News.

Extreme conditions on Saturday forced event organisers to cancel some outdoor festivals and parades.

Melbourne’s famous Moomba Parade was cancelled over safety concerns for performers and spectators.

Patrons at the Pitch Music and Arts Festival in southwest Victoria were told to leave by Saturday morning, as those yet to arrive were warned to stay away.

One of the stages at Adelaide’s WOMAD was closed on Sunday due to the heat, while a handful of other events was postponed until late at night or cancelled.

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