Temperatures soared in Penrith yesterday to a record-breaking 47.3 degrees.
The temperature was just shy of the city's all-time high of 47.8 C (118F), set in 1939.
The Penrith observatory recorded a minimum of above 30 degrees Celsius, with humidity as high as 91 percent. The winds are expected to move west, providing some relief to Penrith, Richmond and other suburbs to the west.
Some 9,000 properties were left without power throughout the region.
Parts of this plan include a fire ban and an urge for citizens to stay hydrated and sheltered from the sweltering heat.
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According to CBS News, the Police Deputy Commissioner of New South Wales (Catherine Burn) said the state activated its #heat wave plan in an attempt to combat the extreme and unsafe conditions.
According to the country's meteorological department, Sydney's localities - Parramatta, Liverpool and Richmond recorded maximum temperatures of around 40, 39 and 41 degrees Celsius respectively.
On Monday morning, the sporting world was rocked by the news that the captain of England's Cricket team had to be rushed to hospital after battling severe dehydration during the fourth day of the final test match against Australia in Sydney.
Climate scientists say rising sea and land temperatures as a result of global warming explain the hundreds of weather records broken or nearly-broken over the last several years in Australia.