The Perth metropolitan area has recorded more than three times its average monthly rainfall for March, its wettest in more than 40 years.
A cold front which passed over the southern half of the state dumped more than 23 millimetres of rain in Perth.
The weather bureau says so far this month the city has received almost 70 millimetres of rain, while the average is 19 millimetres.
Strong winds have been recorded along the coast between Albany and Geraldton.
Rottnest Island recorded a gust of 100 kilometres an hour.
Forecaster Neil Bennet says it is the wettest March since 1971.
The Bureau of Meteorology is predicting an encouraging rainfall outlook for the state in coming months.
Mr Bennett says the three month seasonal outlook suggests there will be 'average' conditions which is better than other years.
He says in the past, 'drier than average' conditions have been predicted.
Mr Bennett says the increase in rainfall is mainly due to above average sea surface temperatures.
"That's better than the starts we've had over the last couple of years where we've had very dry and hot conditions coming out of summer and continuing through March and the early part of April," he said.
The wettest March on record was in 1934 when 145 millimetres fell.
© ABC 2013
18:56 EDT A series of spectacular electrical storms over Perth has blacked out more than 27,000 homes and businesses and caused flight delays.