Most Monthly Precipitation in Baltimore History

This is a list of the largest monthly precipitation totals ever recorded in Baltimore, Maryland history from 1871–2024.

What Was the Wettest Month in Baltimore History?

According to NOAA records, the most precipitation that Baltimore, Maryland has ever received in a single month is 18.4 inches which occurred in August 1955.

Baltimore Most Rain in One Month

Rank	Precipitation	Month
1	18.4 inches	August 1955
2	16.7 inches	July 2018
3	13.8 inches	August 1933
4	13.3 inches	September 2011
5	13.1 inches	June 2015
6	12.4 inches	September 1934
7	12.3 inches	August 1911
8	11.8 inches	August 2020
9	11.5 inches	September 1999
10	11.0 inches	July 1889
11	10.9 inches	August 1971
12	10.7 inches	July 1905
13	10.5 inches	September 1876
14	10.4 inches	August 2011
15	10.2 inches	July 1945
16	10.1 inches	August 1942
17	10.0 inches	June 1972
18	9.9 inches	August 1915
19	9.7 inches	August 1928
20	9.5 inches	August 1873