Forget about that sunny spring weekend, south-east Queensland, as it is shaping up to be a wet one.

Friday's scattered showers will to continue well into the evening ahead of expected thunderstorms and heavy rainfall across south-east Queensland from Saturday morning.

Weatherzone meteorologist Graeme Brittain said a low pressure trough crossing the bottom of the state was the cause behind the expected stormy weather.

"Some of the thunderstorms are likely to be severe with damaging gusts in places but these are going to be quite isolated," he said.