There are 50 bushfires burning across the state but authorities are most concerned about two blazes, with emergency warnings in place for fires at Myall Park near Miles and Montrose at Tara.
More than 40 residents from homes at Tara remain in evacuation centres on Monday.
Firefighters believe structures may have been lost but have been unable to access either area.
No fatalities or significant injuries have been reported, but firefighters said a number of people had been treated for smoke inhalation or heat exhaustion.
While conditions eased slightly overnight as humidity increased, firefighters are braced for another challenging day on Monday.
"Unfortunately, we are expecting another warm day, not as warm and not as challenging as yesterday, but still a very difficult day so the conditions will probably worsen through the day as the heat of the day comes on," Queensland Fire and Emergency Services state operations coordinator James Haig told the ABC.
Mr Haig said there had been reports of structure losses, but fire crews had yet to assess the damage.
"We're really focused on containing the fires, that's stopping them spreading further and then bringing them under full control."
The Myall Creek fire has burnt through about 2300 hectares and continues to pose a threat, travelling between Myall Park Road and the Leichhardt Highway towards Warramoo Road and Old Forrest Road.
Firefighters are working to contain the fire. However, major roads in the area have been impacted.
The fire at Tara is smaller at about 840ha in size.
It continues to burn between South Road, Chinchilla Tara Road, Wieambilla Road, Church Road and Weranga North Road.
Water-bombing aircraft, two air support crews and dozens of ground crews remain on alert at both blazes.
Queensland sweltered through its hottest day in nearly two years on Sunday, with 40-plus temperatures in various parts of the state.
18°C