An "unseasonable" rain event gripping northern Australia is expected to move further east after hitting the outback with record-breaking rain.
The wet winter weather is being fuelled by "an unseasonable abundance of tropical moisture, Weatherzone said.
This moisture has been heavily reinforced by an upper-level trough, leading to record-breaking rain totals across parts of the Northern Territory.
Tennant Creek received 39.4mm of rain, its highest daily rainfall for the month of July in 45 years, in the 24 hours to 9am Sunday.
While the Territory Grape farm in Anmatjere, NT, registered its highest July rainfall total in 18 years, with 23.3mm.
As the rain sweeps eastwards across the country, more states are set for a soaking.
"Another wet day is in store for Queensland," Today weather presenter Tim Davies said.
"We will see showers moving into parts of NSW as well today. We can also expect to see cloudy conditions around our southeastern corner."
"We will see showers moving into parts of NSW as well today. We can also expect to see cloudy conditions around our southeastern corner."
The comments come after Camooweal, near Queensland's western border, received 25.4mm of rain by 9am Sunday.
This makes for the outback town's highest July rainfall total in 37 years.
The weather system is expected to stick around until Wednesday when it will "weaken significantly," according to Weatherzone.
"The heaviest falls will be concentrated over Qld until Wednesday, with most of the state expected to receive 30-80mm in the next 72 hours," Weatherzone said.
Most of the capitals have also shivered through a frosty start to the day, and the chill is expected to intensify thanks to an icy blast.
Fires to floods: Wild weather hits Australia's east-coast
A thick cloud forming over Australia will see temperatures plummet up to 15 degrees below average later this week.
Today residents in Canberra woke to a knee-knocking -3 degrees, while those in Hobart experienced a 3 degree start.
The mercury dipped to just 7 degrees in both Melbourne and Adelaide, while Perth was hit with a low of 9 degrees.
Things were slightly warmer in Sydney, with the Harbour City recording a minimum of 10 degrees.
Brisbane saw a low of 14 degrees and Darwin clocked a balmy 19 degrees.
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