Kennewick Average Temperature by Month

This page shows the average temperature in each month of the year in Kennewick, Washington. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Kennewick?
In Kennewick, Washington, the warmest month is July, with an average daily high temperature of 92.2 °F and an average low of 58.3 °F.
What's the Coldest Month in Kennewick?
In Kennewick, Washington, the coolest month is January, with an average daily high temperature of 41.6 °F and an average low of 28.1 °F.
Month Avg. High Avg. Low
January 41.6 °F 28.1 °F
February 48.4 °F 28.9 °F
March 58.6 °F 33.7 °F
April 66.9 °F 39.6 °F
May 76.2 °F 47.1 °F
June 82.9 °F 53.5 °F
July 92.2 °F 58.3 °F
August 90.7 °F 57.3 °F
September 80.8 °F 48.9 °F
October 65.9 °F 39.7 °F
November 50.5 °F 32.3 °F
December 41.1 °F 27.9 °F
Year 66.3 °F 41.3 °F
Weather Station Details
Years Station Coordinates
1999–2024 Pasco Tri Cities Airport location
1894–1998 Kennewick location