Kennewick Average Rainfall by Month

This page shows the average precipitation in each month of the year in Kennewick, Washington. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Kennewick?
In Kennewick, January has the greatest precipitation of any month. On average, Kennewick gets 1.1 inches of precipitation in January.
January is also the month where rain is most common. 34.5% of days in January will have at least some rain.
What's the Driest Month in Kennewick?
In Kennewick, July has the least precipitation of any month. On average, Kennewick gets 0.20 inches of precipitation in July.
August is the month with the lowest chance of precipitation. Only 6.6% of days in August will have measurable rain.
Month Precipitation % Chance
January 1.07 in 34.5
February 0.68 in 28.2
March 0.69 in 24.3
April 0.65 in 23.2
May 0.75 in 22.2
June 0.61 in 16.3
July 0.20 in 7.2
August 0.20 in 6.6
September 0.28 in 9.7
October 0.65 in 20.7
November 0.86 in 30.9
December 1.07 in 33.0
Year 7.69 in 21.5
Weather Station Details
Years Station Coordinates
1999–2024 Pasco Tri Cities Airport location
1894–1998 Kennewick location
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