Millions of Australians face wet and gloomy long weekend weather

Millions of Australians may need to switch up their long weekend plans as the east coast prepares for an Anzac Day deluge.

A cool change is sweeping across New South Wales and Victoria this week and a low pressure system is forecast to bring a rainy washout from now until Sunday.

While some capital cities will enjoy some pleasantly warm temperatures for late April, dark clouds threaten to cast a gloomy shadow over the three-day weekend.

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New South Wales

In Sydney, around 46mm of rain is expected to drench the city across the three-day long weekend after an already wet start to the week.

The temperature will remain balmy with a top of 25 degrees on Friday but showers may dampen any campers hoping the make the most of the final blast of April warmth.

Northern NSW will likely be hit with the bulk of the gloomy weather with a deluge smashing towns across the coast including Lismore and Yamba with 25-50mm of rain on Friday.

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Victoria

Melbourne is in for a similarly rainy weekend and the worst of the deluge is expected to hit on Friday with up to 25mm of rain lashing the city on Anzac Day, with a small chance of showers on Saturday and Sunday.

Temperatures are set to dip to 19 degrees in Melbourne on Saturday after a warmer end to the week.

Parts of western Victoria will see between 10 and 25mm on Friday, with conditions easing by Saturday.

Queensland

Those in Brisbane will enjoy some late April high temperatures with a chance of light showers on Friday as the city narrowly avoids the rain from northern NSW.

It's forecast to reach a top of 26 degrees on Friday and Saturday, jumping slightly to 27 degrees on Saturday.

In Far North Queensland, between 10-15mm of rainfall could lash the edge of the coast on Saturday and Sunday.

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Western Australia

It'll be clear skies for Perth on Anzac Day with not a drop of rain forecast for the start to the long weekend.

A small chance of rain is expected on the south-west coast of WA including Albany, Eucla and Cape Leeuwin.

On Saturday, Western Australia's North West Cape is forecast for 5mm of rainfall and this system is expected to move slightly south-east towards Meekatharra on Sunday.

South Australia

Adelaide is in for a mostly dry weekend with only light scattered showers across South Australia's south coast.

It's set to reach a top of 24 degrees on Friday and 20 degrees on Saturday.

ACT

The nation's capital will enjoy a partly cloudy day on Anzac Day with a top of 24 degrees, however a shower or two is expected on Saturday as temperatures drop.

Northern Territory

Darwin won't escape the light showers on Friday and Saturday but temperatures will reach a high of 30 degrees across both days, so it'll be a gloriously hot few days in the Northern Territory.

But Sunday could bring around 25mm of rain in the Top End.

Tasmania

The cool change is also set to sprinkle some rain across Hobart on Friday despite it being a balmy 21 degrees, before temperatures plunge to 18 degrees on Saturday.

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