The heat which has building over the interior of WA will move across to SA and VIC, bringing with it high temperatures on Sunday.
Adelaide will see temperatures pushing to 39 degrees on Sunday, which is about 12 degrees above average for December. The northerly winds that will be transporting the hot airmass into southern Australia will also be very dry, leading to increased fire dangers.
Sunday temperatures in Melbourne will also reach into the high thirties. The city is forecast to reach 39 degrees, which will make it the hottest day of the month so far.
Relief from the heat for coastal SA will arrive later on Sunday with a cool southwesterly change, bringing the temperature down for Christmas. Temperatures will return to normal for Adelaide, around 26 degrees on Monday. On Christmas Day, the temperature will also sit in the mid twenties with mostly sunny skies.
For Melbourne, the cool change will arrive early on Monday morning. This will bring a few showers early on Christmas Eve with temperatures only reaching into the mid twenties. For Christmas Day in Melbourne, cool southerly winds will hold the temperature in the low twenties, but showers will clear to mostly sunny skies.
It will be a great day to head to the Boxing Day Test in Melbourne as skies remain clear and temperatures reach the mid twenties.
© Weatherzone 2012
17:34 EST The weather bureau's long-term forecast is predicting a drier than normal October to December for much of eastern Australia and north-west Western Australia.