The NSW Department of Environment and Heritage - NSW Climate projections map for 2020-2039 and 2060-2079 - click on the link below

http://www.climatechange.environment.nsw.gov.au/Climate-projections-for-NSW/Interactive-map

For the Macarthur region there will be an increase in hot days (temp >35C )

"Change in number of days a year max temp > 35ºC

Hots days are projected to increase across the region by an average of 11 days per year by 2070. The greatest increases are seen in the central part of the region from Picton to north of Wiseman's Ferry and out to Katoomba. These regions are projected to have additional 10-20 hot days per year"