The strongest cold front of the year so far is expected to hit Perth and the south-west corner of WA on Sunday evening, with the worst of the weather likely to last until Monday morning.
The Bureau of Meteorology (BOM) has warned it will be windier than a typical front.
"This sort of event occurs once or twice during winter storm seasons — this is the strongest one for this season so far," BOM's state manager Matt Collopy said.
"The most concerning thing is the damaging or destructive winds.
"The potential for some heavy rain is there but it's not the main concern this time."
Winds up to 100 kilometres per hour are likely south-west of a line from Jurien Bay to Narrogin to Albany from 5:00pm on Sunday and gusts of up to 125 kilometres per hour are possible in isolated areas.
The worst of the wild weather is most likely to hit areas south-west of a line from Bunbury to Bremer Bay between 11:00pm Sunday night and 5:00am Monday.
In Perth, the most severe conditions are expected between midnight on Sunday and 5:00am on Monday morning.
While the south-west has experienced a series of cold fronts over the weekend, the Department of Fire and Emergency Services' district officer of Natural Hazards Chris Kin-Muang warned residents to be prepared and secure any loose objects around their homes.
"It's not a time to be complacent. Even though householders may have been unscathed over the last couple of days, now is the time to prepare," Mr Kin-Maung said.
"Our state emergency service volunteers and our emergency services are ready and are on heightened alert, however we're asking the community to prepare themselves also."
A flood watch has also been issued for the South West and Lower West districts.
While only 20 to 40 millimetres of rain is expected in Perth over a 24-hour period, flooding is possible due to previous heavy rainfall.
Conditions are expected to ease on Monday.ABC