Three students have been taken to hospital suffering from the heat after paramedics were called to a school north of Brisbane on Friday morning.
An ambulance spokeswoman said they were called just before 10am to College Street in North Lakes.
A teenage girl has been taken to Prince Charles Hospital, a teenage boy to Redcliffe Hospital and another teenage girl to Caboolture Private Hospital.
All patients were in a stable condition suffering from heat-related illness and paramedics remain on scene.
Health officials have issued warnings for the intense heatwave much of Queensland is set to face at the weekend, with records expected to be broken.
Brisbane was expecting tops of 39 degrees on Sunday, but Birdsville could reach 46, with temperatures about nine degrees above the February average.
Southerly winds would bring a brief reprieve on Monday, with maximums of 36 forecast.
Gold Coast beaches were also closed on Friday and a very high fire danger was also in place for the weekend in the south-east.