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Kununurra Airport has been hit with heavy rainfall overnight, but the Pilbara is next in line - followed by Perth later this week. Vision: Nine News Perth.
Perth is set to cop a lot of rain over coming days.
The bureau says a weak low may form in the monsoon trough on Monday near the west Kimberley coast.
"The system will slowly develop while moving west or southwest away from the Kimberley during Tuesday," the bureau says.
"There is a moderate risk of this system developing into a tropical cyclone during Wednesday as it moves over open waters north of the Pilbara coast."
Perth has so far experienced a relatively cool start to February. The highest maximum so far this month was 32.6 degrees on February 3.
This time last year the city was sweltering through a boiling hot four day heatwave. Between February 7-10, the maximum in Perth went above 40 degrees on all four days.