Sioux City Average Rainfall by Month

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

Average temperature by month

What's the Rainiest Month in Sioux City?

In Sioux City, June has the greatest precipitation of any month. On average, Sioux City gets 4.3 inches of precipitation in June.

June is also the month where rain is most common. 39.0% of days in June will have at least some rain.

What's the Driest Month in Sioux City?

In Sioux City, January has the least precipitation of any month. On average, Sioux City gets 0.69 inches of precipitation in January.

November is the month with the lowest chance of precipitation. 19.8% of days in November will have measurable rain or snow.

Month	Precipitation	% Chance
January	0.69 in	21.8
February	0.86 in	22.7
March	1.76 in	26.0
April	3.15 in	33.4
May	3.87 in	38.8
June	4.35 in	39.0
July	3.35 in	29.1
August	3.94 in	31.6
September	2.84 in	26.7
October	2.20 in	24.5
November	1.27 in	19.8
December	0.99 in	21.9
Year	29.24 in	28.0

Weather Station Details

Years	Station	Coordinates
1948–2024	Sioux City Gateway Airport	location