Melbourne has sweltered through its hottest November night in more than 100 years, with temperatures staying above 24 degrees for the first time since 1901.
The lowest temperature recorded in the city was 24.6 degrees Celsius.
Senior meteorologist Phil King says a front bringing rain and possible storms will move over Melbourne later today.
"Already right through South Australia, storms are approaching our western border, so we're likely to see a very humid, sticky day today, humidity is very high," he said.
"I think the wettest period will come late afternoon, evening."
Hot conditions yesterday sparked numerous grass and scrub fires, all of which have been brought under control.
Ouyen in Victoria's north-west recorded a high of 45.8C, the highest November temperature ever for the state.
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00:30 EDT Locals on the Cocos Islands have spent Christmas Day hunkered down in their homes, as Tropical Cyclone Kate passed just north of the tiny community more than 2,000 kilometres off the West Australian coast.