It comes after parts of Queensland dropped below freezing on Friday morning, with the southern Queensland town of Roma hitting a low of -1.7 degrees at 6.20am.

Brisbane reached a minimum of 11 degrees just after 7am on Friday while the Ipswich suburb of Amberley hit a morning low of 3.2 and Gatton, west of Brisbane, dropped to 4 degrees.

Roma, 400 kilometres north-west of Toowoomba, was the coldest Queensland town. Applethorpe, near the state border, dropped to -1.4 and Oakey, in the Toowoomba region, dipped to -1.6 degrees.

Looking ahead, Brisbane was forecast to drop to 6 degrees on Saturday and Sunday morning.

However, Stanthorpe, also near the state border, was expected to shiver through overnight minimums of -6 degrees on Saturday, -5 on Sunday, -4 on Monday and -3 on Tuesday.

Roma was predicted to drop to -3 degrees on Saturday and -4 on Sunday while Oakey was forecast to hit lows of -3 on both weekend mornings.

BoM meteorlogist Michael Knepp said a combination of a dry air mass, clear skies and light winds over Queensland was the cause for the sudden drop in temperatures.

He said Brisbane could on the weekend shiver through temperatures below those experienced on the coldest 2018 day so far, which was recorded on June 16 when minimums dropped to 6.9 degrees.

He said there was also the potential for frost in coming days with temperatures expected to drop into negative figures in the south-east and southern interior.

Mr Knepp said more moisture was expected near the surface next week, meaning temperatures were forecast to gradually warm up.

Meanwhile, Brisbane's low-lying and coastal suburbs face the risk of flash flooding until next week with a "king tide" forecast to bring tidal peaks of more than 2.7 metres.

Residents in areas prone to localised flooding have been asked to not park their cars on the street, with Brisbane City Council saying sandbags were also available if needed.