Widespread rainfall is expected to hit Australia's east coast today, paving the way for more wild, wet weather next week.

The heavy showers will impact communities from southeast Queensland all the way down to South Australia from today right through to next Thursday at least.

Meteorologists say the conditions are due to a large upper-level cut-off low pressure system which will move over Australia's southeast in coming days.

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The heaviest of that weather system will hit the east coast between Tuesday and Friday next week before moving further towards the Southern Ocean.

A high-pressure system is keeping most other locations dry.

Sydney will see tops of 18C today while Melbourne and Queensland will have tops of 17C and 22C respectively.

Adelaide will have a top of 17C while Canberra will not go past 14C.

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Elsewhere, Hobart will have top of 16C while Perth will be 21C and Darwin will be a warm 32C.

The east coast's wet weather comes after a week of icy conditions saw records break for the coldest May days in decades.

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The owner of a small sunflower oil factory in Bulgaria has accused US soldiers of illegally storming his facility during a NATO military exercise last month.

Marin Dimitrov told reporters on Wednesday that he had filed a lawsuit against those responsible for the May 11 incident.

Swift Response 2021 was a US Army-led multinational exercise held across Estonia, Bulgaria and Romania and involving more than 7,000 paratroopers from 10 NATO countries.

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During the drill, members of the Italy-based 173rd Airborne Brigade simulated seizing and securing the decommissioned Cheshnegirovo Air Base in southern Bulgaria by clearing bunkers and other structures, a US Army statement said.

On May 11, American soldiers entered and cleared a building next to the airfield that they thought was part of the training area but turned out to be occupied by Bulgarian civilians operating a private business, according to the statement.

"No weapons were fired at any time during the interaction," the Army statement said.

Bulgarian President Rumen Radev said it was "absolutely unacceptable to have the life and calm of Bulgarian citizens put at risk by military units, be they part of the Bulgarian or foreign armed forces."

"Exercises in Bulgarian territory involving our allies should boost the sense of security and trust in collective defence, instead of causing tension among Bulgarians," Mr Radev said.

The US Embassy in Bulgaria offered apologies to the business and its employees.

"We always learn from these exercises and are fully investigating the cause of this mistake," the embassy said in a statement.

"We will implement rigorous procedures to clearly define our training areas and prevent this type of incident in the future."

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A client at a massage parlour and several workers have run for their lives from a central Adelaide building police believe was deliberately set on fire.

Witnesses said a client smashed the window and jumped from the second storey before he and some passersby wheeled an industrial bin over to the window to allow four trapped workers to escape.

The fire broke out just after 6pm at a massage business on the corner of Rundle Street and Vaughan Place in the middle of the city.

9News obtained exclusive vision of a stairwell on fire, as well as a woman running down that stairwell trying to get away.

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It is understood the building has multiple businesses inside of it.

Police believed the fire was deliberately lit, although the business' owner told 9News she thought it was an accident.

Most of the building was saved it's feared the damage bill could top $200,000.

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Four people were treated for minor injuries including smoke inhalation.

Any witnesses are asked to call Crime Stoppers on 1800 333 000, or online at www.crimestopperssa.com.au