Queensland fire crews are still battling extremely difficult conditions as they try to save communities from two huge fires.

There are about 50 fires burning around the state on Sunday but a blaze at the border towns of Applethorpe and Stanthorpe and a fire in the Gold Coast hinterland are causing the most concern.

A fire burns in the Gold Coast hinterland. Credit:Aleksandar Romanov

"Firefighters are still fighting there in difficult conditions and that is expected to continue for days," a Queensland Fire and Emergency Services spokesman says.

Twenty structures have been destroyed by bushfires since Thursday when the state's fire season began with severe to extreme conditions across much of the south.