Walla Walla Average Temperature by Month

This page shows the average temperature in each month of the year in Walla Walla, Washington. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Walla Walla?
In Walla Walla, Washington, the warmest month is July, with an average daily high temperature of 90.3 °F and an average low of 62.1 °F.
What's the Coldest Month in Walla Walla?
In Walla Walla, Washington, the coolest month is January, with an average daily high temperature of 41.9 °F and an average low of 30.5 °F.
Month Avg. High Avg. Low
January 41.9 °F 30.5 °F
February 46.5 °F 32.4 °F
March 55.7 °F 37.4 °F
April 62.8 °F 42.1 °F
May 71.9 °F 49.1 °F
June 79.5 °F 55.0 °F
July 90.3 °F 62.1 °F
August 88.9 °F 61.6 °F
September 78.7 °F 53.6 °F
October 63.8 °F 43.8 °F
November 49.1 °F 35.1 °F
December 40.9 °F 29.8 °F
Year 64.2 °F 44.4 °F
Weather Station Details
Years Station Coordinates
1949–2024 Walla Walla Regional Airport location
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