Multiple Aussie states are set to be hammered by fierce winds, rain and thunderstorms as a low pressure system batters the country's south-east.

Damaging winds are expected to cut power and bring down trees across parts of South Australia, Victoria and NSW tomorrow.

Coupled with a cold front, the weather system has already lashed SA with strong winds today as it tracks southeasterly towards western Victoria.

"Tomorrow is going to be amongst the windiest days, if not the windiest day of the springtime," meteorologist Angus Hines said.

Strong winds are expected to intensify overnight and move into eastern parts of Victoria and NSW tomorrow.

Severe weather warnings are in place across SA, Victoria and NSW, with wind gusts reaching 90 to 110 km/h expected in some areas overn

See Full Page