Most Monthly Precipitation in Sioux City History

This is a list of the largest monthly precipitation totals ever recorded in Sioux City, Iowa history from 1948–2024.

What Was the Wettest Month in Sioux City History?

According to NOAA records, the most precipitation that Sioux City, Iowa has ever received in a single month is 16.7 inches which occurred in June 2014.

Month to date though April 26, 2024: 3.4 inches

Sioux City Most Rain in One Month

Rank	Precipitation	Month
1	16.7 inches	June 2014
2	10.3 inches	July 1972
3	10.1 inches	August 2014
4	9.7 inches	September 1965
5	9.2 inches	July 2010
6	9.1 inches	August 2007
7	8.8 inches	June 1967
8	8.7 inches	June 1957
9	8.7 inches	June 2018
10	8.5 inches	May 1959
11	8.2 inches	August 2017
12	7.9 inches	June 1999
13	7.8 inches	August 1951
14	7.6 inches	June 1962
15	7.5 inches	September 1970
16	7.5 inches	May 1990
17	7.4 inches	September 2018
18	7.3 inches	July 1996
19	7.0 inches	August 1961
20	7.0 inches	July 2019