Perth Average Rainfall by Month

This page shows the average precipitation in each month of the year in Perth, Western Australia. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Perth?
In Perth, July has the greatest precipitation of any month. On average, Perth gets 13.8 cm of precipitation in July.
July is also the month where rain is most common. 53.5% of days in July will have at least some rain.
What's the Driest Month in Perth?
In Perth, January has the least precipitation of any month. On average, Perth gets 1.58 cm of precipitation in January.
January is also the month where rain is least common. Only 7.8% of days in January will have measurable rain.
Month Precipitation % Chance
January 1.58 cm 7.8
February 1.66 cm 8.8
March 1.79 cm 13.2
April 3.07 cm 20.6
May 8.14 cm 34.6
June 12.39 cm 48.2
July 13.77 cm 53.5
August 12.21 cm 49.5
September 7.89 cm 44.8
October 3.36 cm 26.2
November 2.87 cm 19.6
December 0.96 cm 10.8
Year 69.69 cm 28.2
Weather Station Details
Years Station Coordinates
1945–2024 Perth Airport location
1877–1944 Perth Regional Office location
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