Melbourne and Sydney prepare for a small heat wave and residents are told to wait for their warmest day in four months.
The summer spell is ready to get to Melbourne first, with Victoria's capital forecast to reach a mild 24 degrees on Tuesday.
But there is still a warmer climate on the road to Sydney with maximums of 27 scheduled for the coast on Wednesday with the western suburbs to reach 29.
Wednesday and Saturday will be the best days to get some sunshine in Bondi Beach (pictured) this week
Similar temperatures are predicted in Sydney for Saturday.
Melburnians have been warned to enjoy its ephemeral taste of spring while it lasts.
"Tuesday will be the warmest day in Melbourne since May 3," Keris Arndt, chief meteorologist at the Meteorology Office, told Daily Mail Australia.
"A cold front will pass overnight, which will lower the temperature to 17 on Wednesday."
Tuesday's forecast for the country, where Melbourne is expected to be warmer than Sydney
Temperatures will rise again to 22 degrees on Friday before collapsing back to 15 degrees on Saturday and 14 on Sunday.
Fans of Collingwood Magpies and GWS Giants heading to the Melbourne Cricket Ground that night for the AFL semifinal may need to bring their raincoats and umbrellas.
An 80% chance of rain is forecast and may include wind gusts and possible hail.
Brighton Beach (pictured) is the place to be in Melbourne on Tuesday
The Melburnians are also expected to congregate at St Kilda beach (pictured) on Tuesday
North of the border, Sydney residents can also expect above-average temperatures this week with highs of 27 on the coast and 29 in the west.
The last time the Sydney Observatory Hill closed near 27 degrees was on May 4, while Penrith in the west of the city recorded 27.5 on May 24.
"Sydney can expect reasonably warmer temperatures as hot air from the middle of Australia drags down to the coast," Bureau of Meteorology forecaster Gabrielle Woodhouse told the Daily Mail Australia.
The people of Sydney should prepare to sizzle with the warmest weather in the city in four months this week
"A cold front will hit the southern states on Tuesday night, which will not affect the Sydney unit on Wednesday, which will cool things down, especially in the east of the city."
A warm front will sweep the coast, bringing more warm weather on Saturday before a temperature drop to 17 on Sunday, which is expected to bring rain.
Ms. Woodhouse said Sydney's average temperature for this time of year is 20.1 degrees.
The people of Sydney are expected to gather in the back on Saturday before a great change comes.
The hottest September day in Sydney was on September 26, 1965, when the city reached a scorching 34 degrees.
For the rest of Australia, Brisbane will remain sunny in the mid-20s before reaching a peak of 27 this weekend, the warmest day in Hobart this week will be Tuesday with 23 degrees, Darwin will remain humid in the mid-30s , while Adelaide will reach a high of 23 on Friday.
In the west, Perth will be much cooler with temperatures that will remain below 20 degrees until the weekend.
AFL fans should bring their raincoats and umbrellas to the MCG (pictured) this Saturday night