Seattle Average Rainfall by Month

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

Average temperature by month

What's the Rainiest Month in Seattle?

In Seattle, November has the greatest precipitation of any month. On average, Seattle gets 6.3 inches of precipitation in November.

November is also the month where rain is most common. 61.4% of days in November will have at least some rain or snow.

What's the Driest Month in Seattle?

In Seattle, July has the least precipitation of any month. On average, Seattle gets 0.59 inches of precipitation in July.

July is also the month where rain is least common. 15.2% of days in July will have measurable rain.

Month	Precipitation	% Chance
January	5.77 in	60.3
February	3.76 in	55.9
March	4.16 in	55.1
April	3.18 in	50.1
May	1.88 in	36.3
June	1.44 in	30.6
July	0.59 in	15.2
August	0.97 in	15.9
September	1.59 in	27.8
October	3.91 in	46.0
November	6.31 in	61.4
December	5.71 in	59.5
Year	39.28 in	42.8

Weather Station Details

Years	Station	Coordinates
1948–2024	Seattle Tacoma International Airport	location
1894–1947	University of Washington	location