Two people were injured and almost 10,000 homes were without power for a time after dangerous thunderstorms swept through south-east Queensland on Wednesday.

The severe thunderstorms come just a day before Queensland's extreme heatwave, with temperatures expected to soar nine degrees above the average.

A woman in her 50s was taken taken to hospital after being struck by lightning in Helensvale.

Paramedics were called at about 3.30pm for the woman, reportedly a traffic controller, who was holding a pole when it was struck by lightning.