Vacaville Average Rainfall by Month

This page shows the average precipitation in each month of the year in Vacaville, California. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Vacaville?
In Vacaville, January has the greatest precipitation of any month. On average, Vacaville gets 5.3 inches of precipitation in January.
January is also the month where rain is most common. 37.9% of days in January will have at least some rain.
What's the Driest Month in Vacaville?
In Vacaville, July has the least precipitation of any month. On average, Vacaville gets 0.004 inches of precipitation in July.
July is also the month where rain is least common. Only 0.22% of days in July will have measurable rain.
Month Precipitation % Chance
January 5.27 in 37.9
February 4.70 in 33.1
March 3.45 in 29.4
April 1.27 in 16.2
May 0.81 in 11.0
June 0.17 in 3.3
July 0.00 in 0.2
August 0.02 in 0.7
September 0.06 in 2.3
October 0.93 in 9.9
November 2.33 in 24.9
December 5.15 in 33.7
Year 24.17 in 16.9
Weather Station Details
Years Station Coordinates
1999–2024 Vacaville Nut Tree Airport location
1893–1998 Vacaville location
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