El Cajon Average Rainfall by Month

This page shows the average precipitation in each month of the year in El Cajon, California. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in El Cajon?
In El Cajon, February has the greatest precipitation of any month. On average, El Cajon gets 2.6 inches of precipitation in February.
February is also the month where rain is most common. 23.7% of days in February will have at least some rain.
What's the Driest Month in El Cajon?
In El Cajon, August has the least precipitation of any month. On average, El Cajon gets 0.021 inches of precipitation in August.
August is also the month where rain is least common. Only 1.2% of days in August will have measurable rain.
Month Precipitation % Chance
January 2.30 in 18.1
February 2.57 in 23.7
March 1.78 in 16.4
April 0.75 in 11.9
May 0.31 in 7.1
June 0.06 in 1.9
July 0.18 in 1.8
August 0.02 in 1.2
September 0.09 in 2.0
October 0.57 in 5.4
November 1.03 in 11.2
December 1.95 in 17.3
Year 11.38 in 9.7
Weather Station Details
Years Station Coordinates
1979–2024 El Cajon location
1899–1979 El Cajon 2 E location
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