The Mandurah State Emergency Services (SES) unit is staying on their toes with more stormy weather poised to hit later this week.
The city was lashed by storms over the past two days, with more than 60 SES members attending more than 30 call outs as heavy rain left houses and businesses flooded.
In one house we had to poke holes through the ceiling just to relieve the pressure that had built up from all the water.Mandurah SES media manager Bec Burns
One house in Halls Head, which had its patio roof sent through a window during the storms that hit earlier this month, once again felt the brunt of the weather as this time the adjacent window was smashed.
Another in Dawesville had a tree collapse through the ceiling, leaving the home unsafe for its residents to live in.
"A lot of our call outs were flooding-based this time around, but the wind still made things really difficult," Mandurah SES media manager Bec Burns said.
"In one house we had to poke holes through the ceiling just to relieve the pressure that had built up from all the water."
According to the Bureau of Meteorology, Mandurah was drenched with 22.8mm of rain across the two-day span, a total that now accounts for more than half of the city's rainfall in the month of May.
The storm also delivered abnormally high tides, which contributed to much of the flooding around the region.
"The higher than normal tides were caused by a combination of the deep low pressure system moving over the southwest of WA yesterday causing a storm surge, and strong westerly winds," a spokesperson from the Bureau said.
"The strong westerly winds also helped create large waves, which, when combined with the higher than normal tides, caused significant beach erosion and coastal inundation."
But it won't be the last rain Mandurah sees this month, with thunderstorms to bring about more wet weather later this week.
The Bureau anticipates a cold front will bring up to 20mm of rain on Thursday, before intensifying into a storm Friday that could see a further 30mm dumped on the city.
That forecast has the local SES crews remaining vigilant.
"The storm on Friday is set to bring about thunder and lightning so that presents a different challenge for us," Ms Burns said.
"Whenever there is lightning we can't get up on roofs to work on houses, so we expect to be pretty busy again later this week."
Mandurah has currently endured 45.2mm of rain for the month of May, and could reach the average 86.6mm during the upcoming wet weather.