Queensland is on edge and firefighters on high alert after a series of fires threatened homes on Saturday, with weather forecasts indicating the danger of further outbreaks remains high.

A bushfire alert for an area north of the Queensland city of Bundaberg was downgraded on Sunday, but residents are still being advised to monitor the situation in case it changes.

Firefighters had earlier warned local residents to prepare to leave their homes on Saturday evening as the unpredictable blaze at Round Hill threatened properties.

Earlier, a fire south of Brisbane near Undullah was also downgraded to an alert level.

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In Sheldon south of Brisbane, a large grassfire on Saturday afternoon destroyed a shed and two caravans.

More than 10 fire crews were needed to bring the blaze under control.

Conditions around Queensland are expected to be even worse on Sunday than on Saturday, with temperatures 10 degrees above average expected for central and northern parts of the state.

Combined with hot westerly winds and low humidity, much of the state was like a tinderbox, fire authorities said.

Residents in rural areas have been urged to take the usual precautions, including avoiding using machinery and power tools if possible, and to call triple-0 immediately if they spot a fire.

-with AAP