Walla Walla Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in Walla Walla, Washington. It is based on NOAA data for the years 1991–2020.

Average temperature by month

What's the Rainiest Month in Walla Walla?

In Walla Walla, November has the greatest precipitation of any month. On average, Walla Walla gets 2.2 inches of precipitation in November.

November is also the month where rain is most common. 43.8% of days in November will have at least some rain or snow.

What's the Driest Month in Walla Walla?

In Walla Walla, August has the least precipitation of any month. On average, Walla Walla gets 0.39 inches of precipitation in August.

August is also the month where rain is least common. Only 7.9% of days in August will have measurable rain.

Month	Precipitation	% Chance
January	1.93 in	42.8
February	1.59 in	39.4
March	2.07 in	39.1
April	1.91 in	37.1
May	2.06 in	31.6
June	1.24 in	23.7
July	0.46 in	8.7
August	0.39 in	7.9
September	0.62 in	12.7
October	1.58 in	28.4
November	2.22 in	43.8
December	2.14 in	43.8
Year	18.12 in	29.7

Weather Station Details

Years	Station	Coordinates
1949–2024	Walla Walla Regional Airport	location