Hot tropical air from a cyclone forming off the coast of Darwin is expected to spread to south-eastern parts of the country this weekend, nudging temperatures into the 30s.

A hot spell will spread across south-eastern parts of the state over the next few days, with Melbourne and Adelaide set to experience maximum temperatures 10 degrees warmer than the April average.

The warm weather has been triggered by the combination of a strong high pressure system moving east from WA, and a tropical low north-west of Darwin, which is likely to form into a tropical cyclone this weekend, Weatherzone reports.

Adelaide and Melbourne will experience a mid-autumn heatwave this weekend. (Weatherzone)

Melbourne is forecast to reach 30 degrees tomorrow and could hit 32 degrees in some areas on Sunday.

The warm weather in Victoria will remain in the high 20s throughout the week.

The mercury will soar to 34 degrees in Adelaide on both tomorrow and Sunday, and will remain in the 30s until Thursday, sitting well above the maximum April average of 22.2 degrees.

Minimum temperatures are also expected to sit six to eight degrees above the average across the weekend in both cities.

The low pressure system is expected to develop into a Category 1 tropical cyclone tomorrow and could strengthen to Category 2 by Sunday evening as it tracks in a southwesterly direction, close to the Kimberley coastline, according to Weatherzone.

The tropical low pressure system is currently forming in the Timor Sea, off the coast of Darwin.
The tropical low pressure system is currently forming in the Timor Sea, off the coast of Darwin. (Weatherzone)

It could develop into a severe tropical cyclone next week, but early indications suggest it is unlikely to cross the WA coast.

Damaging winds and heavy rain could however lash the Kimberley coastline this weekend and early next week as a result of the system.

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