Health authorities are warning people in south-east Queensland to prepare for heatwave conditions.
The weather bureau says the mercury will hit 41 degrees Celsius in Ipswich tomorrow and 37 in Brisbane.
The bureau says a prolonged hot spell through western Queensland will spread to eastern districts, particularly around the state's south-east.
Queensland Health says people who work outdoors, the sick and elderly and young children are among those most at risk from heat-related illnesses.
Authorities say people should remain in an air-conditioned room if they can and drink plenty of water.
People are advised to use wet towels and cool showers to also keep their body temperatures normal.
Queensland Health says people at risk should also avoid sugary drinks, caffeine and alcohol.
Authorities also warn against strenuous outdoor activities and leaving children and animals in parked vehicles.
They are also asking people to keep in touch with those who are sick or frail to ensure they are coping with the conditions
© ABC 2013
14:56 EDT Horsley Park had its warmest December night in at least 15 years as the Sydney Basin barely cooled overnight.