Brisbane is set to sweat this weekend, with temperatures expected to be more than eight degrees above the monthly average and come close to being the warmest September day during the past 10 years.

The Bureau of Meteorology forecast released on Tuesday afternoon predicted temperatures to rise by eight degrees over the four days, hitting a top of 34 on Sunday.

Brace yourselves Brisbane, a sizzling spring is well and truly here. Credit:Glenn Hunt

Despite only being in the early stages of spring, conditions were expected to get even warmer on Monday, peaking with a maximum of 35 degrees - just 0.1 degree below the warmest September day during the past 10 years, which came in 2008.

Meteorologist Sam Campbell said a hot, dry air mass, which was expected to move into the south-east during Thursday and Friday, had been lingering over Queensland for past week.