Most Monthly Precipitation in Portage History

This is a list of the largest monthly precipitation totals ever recorded in Portage, Wisconsin history from 1889–2024.

What Was the Wettest Month in Portage History?

According to NOAA records, the most precipitation that Portage, Wisconsin has ever received in a single month is 18.3 inches which occurred in June 2008.

Portage Most Rain in One Month

Rank	Precipitation	Month
1	18.3 inches	June 2008
2	16.1 inches	August 1980
3	14.4 inches	September 1965
4	13.4 inches	July 1993
5	12.0 inches	September 1938
6	11.4 inches	August 2018
7	11.3 inches	August 2007
8	11.2 inches	June 1917
9	11.1 inches	July 1999
10	10.5 inches	September 2016
11	10.1 inches	May 2004
12	10.1 inches	September 1986
13	10.0 inches	June 1892
14	10.0 inches	September 1915
15	10.0 inches	September 1961
16	10.0 inches	July 2010
17	9.9 inches	August 1995
18	9.8 inches	August 1903
19	9.4 inches	August 1953
20	9.4 inches	May 2018