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.
© ABC 2012
13:51 EST Southeast Queensland has been engulfed by heavy rain due to an east coast low.