As a result, areas in and around New South Wales are precited to touch 40-degree Celcius by Wednesday.
Fire has consumed nearly three million hectares of land across the state this season, supported by hot, dry and windy conditions. Smoke from this fire and others has periodically shrouded the country's largest city in noxious smoke, posing serious health risks, particularly for the young, those with asthma and other chronic conditions, as well as the elderly.
With temperatures set to soar over coming days, NSW Rural Fire Service have declared the statewide total fire ban and is urging communities to prepare.
"The air pollution in NSW (New South Wales) is a public health emergency", said the Climate and Health Alliance.
More than 100 fires are still burning throughout the state, with more than 700 homes destroyed and six casualties in New South Wales bushfires this season.
'We're taking a stare at temperatures correct thru the daytime which will likely be spherical 18-to-25F (10-to-14C) above real looking for this time of year, ' said Jane Golding of the Bureau of Meteorology.
Morrison has defended his government's policies, nonetheless some former fire chiefs enlighten Australia's central government need to take more adjust.
Over the next few days conditions across the fire ground will deteriorate.
Watch and act alerts were also issued on Sunday for the Carrot Farm Road blaze in Deepwater, in the state's northeast, and the Green Wattle Creek fire, south of the Warragamba Dam wall in the Blue Mountains National Park.
Firefighters have been stretched to their limit for months tackling the NSW bushfire crisis, and it won't get any easier for rescue personnel with high temperatures and strong winds forecast for the end of the week.
Smoke haze from the bush fires blankets Sydney Harbour.
The fire is more than 45,000 hectares in size and is being controlled. This is expected to make back-to-back positive IOD events more common, and make Australia even more prone to drought conditions accompanied by extreme heat.
Speaking on Today, Mr Mullins said climate change was the reason for longer and hotter fire seasons.
Frustrated former fire chiefs have vowed to take matters into their own hands, hosting an emergency summit on the bushfire crisis.
At the most recent global climate talks in Madrid, Australia joined the USA and other countries in blocking language from the agreement that would have called for more ambitious cuts to greenhouse gas emissions.
Cassillis resident Stella Cornish, 79, said the fire was the worst she has seen - as she revealed she has lived in the town for most of her life with her husband Doug, 86.
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