The city of Sydney recorded its hottest day on Sunday with the mercury hitting 47.3 degrees Celsius after almost 80 years, according to Australian weather authorities.
Much of Sydney reached its peak temperature at about 3 p.m., with the city's west bearing the brunt of the heat, reports the Guardian.
A severe fire danger rating was issued for the greater Sydney region, while much of the rest of the state has a "very high" rating.
Total fire bans are in place for Sydney and the Hunter region.
The Bureau of Meteorology said cooler conditions were expected to reach coastal areas later in the day.