San Luis Obispo Average Rainfall by Month

This page shows the average precipitation in each month of the year in San Luis Obispo, California. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in San Luis Obispo?
In San Luis Obispo, January has the greatest precipitation of any month. On average, San Luis Obispo gets 4.4 inches of precipitation in January.
However, February is the month with the greatest chance of precipitation. 34.9% of days in February will have at least some rain.
What's the Driest Month in San Luis Obispo?
In San Luis Obispo, August has the least precipitation of any month. On average, San Luis Obispo gets 0.008 inches of precipitation in August.
July is the month with the lowest chance of precipitation. Only 0.75% of days in July will have measurable rain.
Month Precipitation % Chance
January 4.43 in 30.3
February 4.03 in 34.9
March 3.31 in 28.1
April 1.18 in 17.2
May 0.50 in 8.8
June 0.10 in 3.0
July 0.06 in 0.8
August 0.01 in 1.3
September 0.11 in 3.0
October 0.87 in 11.9
November 1.55 in 18.1
December 3.33 in 27.1
Year 19.22 in 15.4
Weather Station Details
Years Station Coordinates
1999–2024 San Luis Obispo Airport location
1893–1998 San Luis Obispo Poly location
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