Most Daily Precipitation in Waterloo History

This is a list of the largest daily precipitation totals ever recorded in Waterloo, Iowa history from 1895–2024.

What's the Most It Has Ever Rained in Waterloo?

According to NOAA records, the most rain that Waterloo, Iowa has ever received in a single day is 5.5 inches which occurred on Friday July 2, 1999.

Also see most rain in: 2 days | 1 week | 1 month

Waterloo Most Rain in One Day

Rank	Precipitation	Date
1	5.5 inches	July 2, 1999
2	5.3 inches	July 16, 1968
3	5.3 inches	July 30, 1942
4	4.9 inches	August 20, 1966
5	4.5 inches	September 19, 1919
6	4.4 inches	June 15, 1980
7	4.1 inches	August 28, 2015
8	4.1 inches	July 17, 1968
9	4.0 inches	September 26, 1915
9	4.0 inches	August 19, 1912
11	4.0 inches	June 13, 1947
12	3.6 inches	August 7, 1991
13	3.6 inches	August 27, 1928
14	3.4 inches	May 29, 1980
15	3.3 inches	August 5, 1998
16	3.3 inches	December 13, 2015
17	3.3 inches	August 19, 1902
18	3.2 inches	September 1, 2018
19	3.2 inches	June 26, 2005
20	3.2 inches	September 22, 2016