Perth braces for fifth monster storm in eight days

Perth is bracing for yet another monster storm, while frantically trying to repair the damage from Friday's weather event.

The ceiling at Deahnn Fanderlinden's Stratton home came tumbling down after a crack appeared during that storm.

Her 13-year-old daughter, Jasmine, only narrowly escaped disaster.

READ MORE: Perth smashed by severe storms

"I got a call so I stepped outside, went to the couch and then bang, everything fell," Jasmine said.

And now the family are fewer than 12 hours away from another superstorm.

It will be the fifth to batter Perth in the past eight days, and, authorities have warned, the biggest of the season.

People are even sandbagging their houses in an effort to prevent flooding.

The storm is set to hit at about 5am on Monday, and last up to 48 hours.

READ MORE: Thousands without power after storms smash Perth

The potential damage zone could stretch more than 770km, from Jurien Bay to Albany.

Winds of more than 100km/h and rainfall of up to 50mm are expected, alongside 8m waves.

People have in particular been warned to be careful of trees, with all the recent rain meaning some may not be as firmly rooted as normal.

It has been the wettest start to July in 56 years, with 117mm already recorded, 82 per cent of the monthly average.