In Penrith, west of Sydney, residents sweltered as the town bore the brunt of the heat on Sunday.
Severe fire warnings were issued for the greater Sydney area and total fire bans were put in place across the city.
Sunday’s temperatures fall short of the scorching heat to hit the area in 1939, when the mercury reached 47.8C.
The sweltering temperatures reached in Penrith were confirmed by the Bureau of Meteorology.
Players participating in the Sydney international tennis tournament were forced off the court at 10:00 local time on Sunday (23:00 GMT Saturday) by the event’s organizers after temperatures court side exceeded 40C.