Australian firefighters used cooler conditions on Christmas Day to try and contain bushfires ahead of hot, dry weather later in the week, as leaders and communities thanked them for sacrificing time with their families over the holidays.

In the state of New South Wales (NSW), which saw entire towns devastated by fires over the weekend, state premier Gladys Berejiklian and the head of the NSW rural fire service, Shane Fitzsimmons, attended a breakfast organized by volunteers in the small town of Colo, 90 kilometers (55 miles) northwest of Sydney.

"Community volunteers provided food, company, conversation, wrapped presents & hampers to share for crews heading into the field," Fitzsimmons tweeted.

Christmas Day offered cooler conditions in many parts of the country as firefighters, many of them volunteers, spent the day trying to contain blazes.

Intense heat is forecast to return again by the weekend, especially in the country's south part, where temperatures are expected to exceed 40 degrees Celsius (104 Fahrenheit).

The last few months have seen more than 900 homes lost across the dry continent, according to authorities, even though the southern hemisphere summer has not yet reached its mid-point.

The fires have destroyed more than 3.7 million hectares (9.1 million acres) across five states and at least six people have died in NSW and two in South Australia during the bushfire emergency.

Prime Minister Scott Morrison used a Christmas message to thank volunteers for their willingness to spend the day away from their families.

"As we look forward to next year and as we celebrate this Christmas I want to thank all of those who serve our nation," Morrison said in a video shared on social media on Wednesday morning.