Most Monthly Precipitation in Philadelphia History

This is a list of the largest monthly precipitation totals ever recorded in Philadelphia, Pennsylvania history from 1894–2024.

What Was the Wettest Month in Philadelphia History?

According to NOAA records, the most precipitation that Philadelphia, Pennsylvania has ever received in a single month is 19.3 inches which occurred in August 2011.

Month to date though April 24, 2024: 4.0 inches

Philadelphia Most Rain in One Month

Rank	Precipitation	Month
1	19.3 inches	August 2011
2	13.2 inches	July 2013
3	13.1 inches	September 1999
4	10.8 inches	August 1915
5	10.6 inches	June 2013
6	10.5 inches	July 1926
7	10.4 inches	July 1994
8	10.3 inches	August 2009
9	10.3 inches	September 2011
10	10.2 inches	August 1933
11	9.8 inches	September 2018
12	9.7 inches	August 1955
13	9.6 inches	August 1971
14	9.4 inches	July 1989
15	9.4 inches	September 1938
16	9.1 inches	November 1972
17	9.1 inches	April 2007
18	9.0 inches	November 2018
19	9.0 inches	September 1902
20	9.0 inches	August 1901