Flood-hit Far North Queensland bracing for more heavy rain, while parts of the west swelter

Some parts of Far North Queensland have recorded more than 200mm of rain in the last 24 hours as the latest weather disaster bears down on the already saturated region.

Heavy rainfall is forecast to develop along the North Tropical Coast tonight, the Bureau of Meteorology warned, just weeks after devastating flooding caused by ex-Tropical Cyclone Jasper.

A severe weather warning was issued earlier this morning but has since been cancelled however rainfall is still forecast.

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A monsoon trough developing off the Gulf of Carpentaria is expected to bring more heavy rainfall and flooding to those regions.

Weatherzone said heavy rainfall, flash flooding and a minor flood warning in the Port Douglas and Daintree area has already been issued.

"Unfortunately, this rain is falling in the same area that received flooding rain from Tropical Cyclone Jasper and an associated monsoon burst last month," Weatherzone said.

The Daintree has already recorded more than 230mm of rain in the past 24 hours while the Stewert Creek Valley area has recorded almost 300mm.

Widespread thunderstorms and rainfall are forecast over the coming days.

Forecasters are warning of rainfall totals from 50mm to 150mm across parts of the far north tropical coast from today.

The monsoon has a 25 per cent chance of strengthening into a Tropical Cyclone, but that depends on the movement of another system forming west of Darwin.

That tropical low will likely bring widespread heavy rainfall to the Top End or Western Australia's Kimberley region into the weekend.

Western Australia has also been put on a heatwave alert this weekend, with the hottest areas of the state forecast to hit temperatures in the 40s.

In the state's north-east, the town of Marble Bar – traditionally the hottest in WA – is expected to reach a scorching 46 degrees on Saturday and Sunday.

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South Australia is also sweltering through a heatwave as temperatures soar to 35 degrees in Adelaide today and even hotter in the north, hitting 38 degrees.

An extreme heatwave warning has already been issued for the north of South Australia.

South Australians are urged to remember that prolonged heat can be dangerous for the elderly and young children or people who are unwell.

Meanwhile, parts of northern Victoria are being warned of further flooding.

Despite rainfall and floodwaters receding, authorities said dozens of homes in the state's north still remained at risk.

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VicEmergency issued a watch and act warning for the town of Shepparton where the Goulburn River level is expected to rise.

The Goulburn River at McCoys Bridge may exceed the minor flood level of nine metres tomorrow.