Riverside Average Rainfall by Month

This page shows the average precipitation in each month of the year in Riverside, California. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Riverside?
In Riverside, February has the greatest precipitation of any month. On average, Riverside gets 2.5 inches of precipitation in February.
February is also the month where rain is most common. 24.2% of days in February will have at least some rain.
What's the Driest Month in Riverside?
In Riverside, August has the least precipitation of any month. On average, Riverside gets 0.024 inches of precipitation in August.
August is also the month where rain is least common. Only 1.1% of days in August will have measurable rain.
Month Precipitation % Chance
January 2.10 in 19.2
February 2.48 in 24.2
March 1.38 in 18.2
April 0.59 in 11.2
May 0.18 in 5.5
June 0.08 in 1.4
July 0.11 in 2.4
August 0.02 in 1.1
September 0.11 in 1.8
October 0.33 in 7.1
November 0.55 in 10.5
December 1.46 in 16.1
Year 9.49 in 9.9
Weather Station Details
Years Station Coordinates
1999–2024 Riverside Municipal Airport location
1893–1998 Riverside Fire Station location
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