The Sydney all time hot day record of 45.8 tops the 45.3 on 14 Jan 1939 but is in the centre of our largest urban heat island, so the number has to be seen in that perspective. We are fortunate to have a map of NSW from the Sydney Morning Herald preserved online with max temperatures recorded as at 11 Jan 1939.

A check on how widespread were all-time high temperatures around the Sydney region on the 18 Jan 2013 finds little support for the 18 Jan 2013 being a regional non-urban all-time record hot day. This Table summarises the regional comparisons. Comments follow the Table in the same order.

Sydney Airport was open from 1929 but daily data is only digitised from April 1939.
Richmond RAAF data – no record there – the all-time hot day is 47.8 on 14 Jan 1939 – max on the 18th was 46.4, a long way shy of 47.8.
Newcastle Nobbys Signal Station recorded 42 which equaled the all-time high on 23 Dec 1990. But Nobbys daily data is only available from 1957 – about 90 years of daily data is waiting in archives for this wealthy nation to enter to disk.
Jerrys Plains Post Office is an interesting case – a site little changed over a century, site open 1907-2012 yet daily data has only been digitised from 1957. But we luckily have a map from the Sydney Morning Herald for 14 Jan 1939 showing the heatwave across NSW on the 11th. This shows Jerrys Plain recorded 120°F or 48.9°C. That puts the temperatures quoted in the map on the Australian today in perspective. Nothing like the heat of Jan 1939.
The Scone Airport reading was topped earlier this months by 44.2 on 12 Jan 2013 – so obviously no all-time hot day in Scone. But we note the 11 Jan 1939 SMH map had 114F or 45.5 for Scone which would have been at Scone Philip Street 61069.
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Picton on the 1939 SMH map recorded 116F – 46.6 and the closest I can find to Picton today is Camden which hit 46.4 on Friday 18 Jan. So so hint of all-time hottest day there.
Cowra on the 1939 SMH map recorded 114F – 45.5, likely at the Cowra Post Office 63021. Cowra Airport on Friday recorded 44.8 but pre 1957 data is not digitised. But no hint of all-time hottest day there.
Canberra on the 1939 SMH map recorded 109F – 42.8, now the Airport 70014 did not commence readings until March 1939 so we do not know for sure where the 109F was measured. In Jan 1939 weather records were kept at Duntroon 70103, Canberra Forest 70015, Canberra Solar Observatory 70100 and Acton 70099. I would guess Acton is the source of the 109F on the SMH map. Canberra Airport on Friday recorded 42 but there was a 42.2 on 1 Feb 1968 so no hint of all-time hottest day in the National Capital.
The SMH map shows Jervis Bay near Nowra was not notably hot on 11 Jan 1939 and I can not locate pre 1955 data to check against the 45.4 on last Friday.
Bega has no pre 1965 daily data available so the 44.6 on last Friday is hard to assess.
Moruya was entered on the SMH map at 111F – 43.9 no doubt from the long term station Moruya Heads Pilot Station which only has dailies entered from 1957. On Friday last Moruya recorded 43.8, so once again the all-time hottest day record still stands.
Summing up it looks obvious that claims of Sydneys hottest day ever on 18 Jan 2013 are not supported by surrounding regional stations. Everything the Australian BoM promotes in our main stream media needs examining with a fine-tooth comb.