National Weather Service United States Department of Commerce

PRECIPITATION RECORDS AT SIOUX FALLS
 

The following are the official top ten heaviest 24-hour precipitation events
on record for Sioux Falls

 

1.  5.07 inches  Sep 19-20th 2018
2.  4.65 inches  Jun 14-15th 2014
3.  4.59 inches  Aug 1st 1975
4.  4.54 inches  Oct 9th 1973
5.  4.40 inches  Jun 20-21st 2018
6.  4.35 inches  May 29-30th 2004
7.  4.32 inches  Jun 16-17th 1957
8.  4.13 inches  Jun 6th 1896
9.  4.04 inches  Oct 5th 1911
10. 4.02 inches  Sep 11th 1966

 

The following are the greatest 24-hour precipitation events by month for
Sioux Falls (in inches melted and by date)

 

Jan   1.61   1-2nd 1960
Feb   2.00   17-18th 1962
Mar   2.39   25th 1995
Apr   3.72   22nd 2001
May   4.35   29-30th 2004
Jun   4.65   14-15th 2014
Jul   3.35   1st 1992
Aug   4.59   1st 1975
Sep   5.07   19-20th 2018
Oct   4.54   9th 1973
Nov   2.68   23-24th 2001
Dec   1.44   2-3rd 1955

 

Note that the most rain ever recorded within the city of Sioux Falls was
7.52 inches in parts of southwest Sioux Falls between 5 pm and 10 pm on
August 27, 2015. Generally 4 to 8 inches fell over most of the southern half
of Sioux Falls, with considerable flash flooding across the southern portions
of the city.  There was also 7.50 inches in a small part of southwest Sioux
Falls between 4 am and 8 am on June 16th in 2004. Southwest Sioux Falls was also
the target with 7.46 inches 4 PM and 7 PM on May 22nd 1993, which resulted in
some of the worst flash flooding in Sioux Falls history.

 

Updated Sep '20