The rest of the week will hover in the mid-to-high 20s, while the weekend will be a little cooler with both days forecast to reach 21.
Melbourne will have its hottest day on Thursday, also hitting a top of 33 degrees before a cool change brings likely showers and a drop to sub-20 temperatures on Saturday and Sunday.
Canberra will peak at 31 on Thursday, followed by 30 on Friday before a windy change brings temperatures briefly down below 20.
Uninterrupted sunshine is the forecast for Brisbane for the next seven days, hitting a top of 33 on Saturday. It’s a similar story in Perth, where the mercury will peak at 32 on Saturday.
Adelaide will hit 31 on Wednesday before reaching a sweltering 36 on Thursday. That heat will subside with a cool change for the weekend, while on Monday it will return to the high-20s.
Darwin, which had its second-hottest day in 78 years of records on Monday with a top of 38.2 degrees, will spend most of the remainder of the week in the mid-30s.
Mr Dutschke said there is a chance parts of western Sydney and Adelaide will see their hottest spring temperatures in five or more years.
As temperatures and winds pick up ahead of the cool change in the southern states, elevated fire danger may result in fire bans in parts of NSW, Victoria and South Australia, he said.
When the cool change hits, however, he said there’s also a chance of snowfall in the alpine regions.
Fire warning for NSW
The increasingly warm, dry and windy conditions in northern NSW are expected to cause problems for firefighters as the week progresses, with the possibility of fire bans towards the weekend.
More than 40 fires are currently burning in NSW, all of which are currently at ‘advice’ level – although 18 are currently burning out of control.
The Rural Fire Service is advising residents and visitors to the state’s north in particular to spend the coming days reviewing their bushfire survival plans in preparation for deteriorating conditions.
Jenny Noyes is a journalist at the Sydney Morning Herald. She was previously a writer and editor at Daily Life.