Temperatures soared in Penrith yesterday to a record-breaking 47.3 degrees.
The temperature in Sydney hit an nearly 80-year high of 47.3 degrees Celsius (117 Fahrenheit) on Sunday - a sharp contrast to the bitter cold that has gripped much of the U.S.
The previous record was set in 1939, when Richmond station in the city's west topped out at 47.8C.
It is forecast to reach 33 degrees Celsius in Sydney city, and 40C in western suburbs.
The Penrith observatory recorded a minimum of above 30 degrees Celsius, with humidity as high as 91 percent.
An afternoon breeze helped cool the city a few degrees.
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Australia is looking at a continuation of the hot weather, with a little rain toward the end of the week, according to most weather reports.
People in Sydney were left without electricity due to a mystery power outage as well.
Parts of this plan include a fire ban and an urge for citizens to stay hydrated and sheltered from the sweltering heat. Wildfires are common during southern Australia's arid, hot summers.
Tomorrow things are expected to be better as, according to the Meteorological Service, the temperature is expected to fluctuate to 40 degrees.
It also took its toll on England in the fourth day of the Fifth Ashes test at the Sydney Cricket Ground, with the tourists struggling to stay in the contest in the extreme heat.