Perth has had its wettest January day in 18 years after ex-Cyclone Joyce drenched South West WA on Monday.
The Bureau of Meteorology said the Perth rain gauge has received 96mm since 9am Monday.
This is nearly ten times the January average of 9.7mm.
Other parts of the metro area copped more than 100mm of rain in the same period.
Bickley recorded 139mm, Swanbourne 139mm and Rottnest was inundated with 142mm.
The rain is set to continue on Tuesday morning with up to 20mm forecast.
BOM says a severe weather warning remains in place for people in parts of Lower West, South West and Great Southern districts.
Main Roads is reminding commuters to allow extra travel time and ensure a safe braking distance when driving on wet roads.
Ex-tropical cyclone Joyce is moving slowly across the Perth coast, bringing showers through until Thursday, according to BOM.