The Bureau of Meteorology says Christmas Day will be fine and sunny with a top of 30 degrees and a light breeze.
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Duty forecaster Peter Newham said the weather either side of Christmas would also be sunny with 29 degrees on Christmas Eve and 24 on Boxing Day.
He said there was a chance of showers on Boxing Day but no other rain was expected over the week.
Mr Newham said the night of Christmas Eve would drop to about 11 degrees and Christmas night would be about 17 degrees.
He said the weather would gradually heat up over the weekend with 28 degrees on Saturday, 32 on Sunday and 36 expected on Monday next week.
He said the next three months were likely to be hotter than average.