Forecasters are predicting a "significant" rain event that will cover practically the whole country and "break records."
It will be colder and more humid in areas throughout the next several days. However, that might simply be a preview of what's to come later next week.
According to Sky News Weather meteorologist Rob Sharpe, over 90% of the country may get rain, with just northern Australia spared.
"Spring has arrived, and it's looking fairly rainy, especially over the following several weeks, compared to what we usually experience at this time of year," he added.
Record-breaking severe weather in Australia
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Rain will begin to fall across southwest Western Australia, north of Perth, early next week.
The large blob of slow-moving moisture then begins to move eastward, as per News.com.au.
"The rain and storm event will gradually spread out and over the country," Mr. Sharpe said.
All forecast models indicate (a rain system) moving in and throughout almost all of Australia over the next week, with the potential for heavy rainfall, particularly in the Murray Darling basin.
Falls of rain above 50mm is especially probable around the New South Wales coast.
Beginning in Perth, the city may be able to avoid much of the precipitation. There may be some rain throughout the weekend, with up to 10mm expected on Monday. Wetter farther south, with Albany expecting up to 25mm of rain on Monday and Tuesday.
For Adelaide, a dry and pleasant weekend is forecast, but rain is expected to begin on Wednesday, with up to 10mm falling on Thursday of next week.
Melbourne will get a few showers throughout the weekend before taking a rest. However, severe rains are expected later next week.
Those stronger showers are expected to arrive in Canberra on Thursday of next week.
As a low-pressure system settles over the east, Sydney may see nonstop rain for the next week.
Sunday may see 8-15mm of rain, with another 8mm possible on Monday. It then simply continues going and may pick up even more towards the end of next week.
This weekend saw extremely severe rainfall throughout NSW's mid-north coast. Rainfall of 70-100mm at Port Macquarie on Saturday and Sunday, with more expected as the week unfolds.
Brisbane might receive 10-20mm of rain on Friday, followed by 15-30mm on Sunday. The skies will clear, but rain is expected to return within a few days.
Showers are expected to clear in time for Brisbane's Riverfire
According to Weatherzone, a trough in the east is causing rain in Queensland, which might lead to floods.
"We've witnessed widespread amounts of 15 to 30mm and isolated falls of up to 50mm," said Dean Narramore, a meteorologist.
This may appear to be terrible news for festival-goers at Brisbane's famed Riverfire, which is expected to take place tonight with record attendance following the COVID-19 epidemic, as per 9News.
But, according to Narramore, there should just be one or two showers in Brisbane tonight, so viewers won't get drenched.
"The good news is that as we travel into the night for the all-important Riverfire in Brisbane, it appears that we will get one or two showers," Narramore said.
NSW is in the path of a rain
Meanwhile, northern NSW is under attack, with up to 100mm of rain anticipated today.
"Widespread falls of 40 to 50mm, with isolated falls exceeding 100mm; I've already seen 20 or 30mm," Narramore said.
"The rain should continue today, diminish later tonight, and be completely gone by tomorrow morning."
This rain has prompted additional flood warnings for rivers in the state's north.
"This may create riverine flooding in certain locations, with a flood watch issued for the Orara, Bellinger, and Hastings Rivers on Friday afternoon," Weatherzone warned.
