An east coast low forming off the NSW coast could make things interesting with rainfall anticipated through Sydney Central Coast and Illawarra. Of course, positioning of the low can greatly influence totals!

Rain
Rain band and East Coast Low 25th to 26th December 2013
More storms near Sydney, NSW
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All storm reports from Sydney, NSW →
Also on 25 December
Extended Range Forecast of Record Heat!
25 Dec 2019 · Sydney, NSW
Bilpin Storm and Lightning 24th December 2016
25 Dec 2016 · Bilpin, NSW
Northern Tablelands Storm Chase 23rd December 2016
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Strong monsoon low and possible tropical cyclone Top End NT 25/12/2015
25 Dec 2015 · Top End, NT
Tropical Cyclone Kate forms near the Coca Islands 25th December 2014
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NSW & Victorian Storms 25/26-12-2011
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Possible severe flooding for SEQ and NE NSW from 26 Dec 2010
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NSW/QLD Storms, Widespread Rain and Floods 25-31st Dec 2009
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Cooler drier day today
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This system brought 26 mm of rain to Blacktown where I live. Generally rainfall across Sydney was not that heavy with 10 to 31 mm being common. Rainfall was evenly uniform across the city.
However this system has provided back to back cool, cloudy and rainy Christmas Days in a row (2012 and 2013 Christmas Days have been wet) and apparently at Observatory Hill Sydney, around 21 mm of rain fell which is the same amount that fell on Christmas Day in 2012.
The heaviest falls occurred around Wollongong where upwards of 50 mm fell.