Last Thursday, 38 degrees, 100F.
Today (5th) 18 degrees, 64F.
Saturday, 37, 98F.
For those of you who don't live in Melbourne, when the wind blows from the north, it brings superheated warm air from the inland central desert area of Australia. It is a bone dry and searing heat and is usually accompanied by nasty and dirty wind and that is when we have bad bush fires.
The pattern usually starts with a nice sunny day, the next day gets quite hot, maybe 30 degrees and the following day the hot northerly wind arrives, followed not too long after, a day or two mid summer, by a cool southerly wind and the temperature drops right back.
This applies to Melbourne in the south of our state of Victoria. It is hotter in the north of the state. The weather works much the same for Tasmania, although being further south, it is a little cooler there.
It also applies to to a lesser extent to Adelaide in South Australia, but other states and their capital cities have quite different weather patterns.
Sydney never gets quite as hot as Melbourne, It is more humid and has a higher rainfall than Melbourne. Its far western suburbs can have a very different temperatures to Sydney City and the salubrious eastern suburbs. There are exceptions, but Sydney weather is often the opposite to Melbourne's weather
PS This is a bit old, like two weeks. The weather remains as variable as ever.