Most Daily Precipitation in Portland History

This is a list of the largest daily precipitation totals ever recorded in Portland, Maine history from 1871–2024.

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

According to NOAA records, the most rain that Portland, Maine has ever received in a single day is 11.7 inches which occurred on Monday October 21, 1996.

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

Portland Most Rain in One Day

Rank	Precipitation	Date
1	11.7 inches	October 21, 1996
2	7.8 inches	August 19, 1991
3	7.5 inches	October 6, 1962
3	7.5 inches	September 11, 1954
5	6.4 inches	August 13, 2014
6	5.6 inches	October 10, 1998
7	5.6 inches	September 30, 2015
8	5.3 inches	September 6, 1896
9	5.2 inches	April 2, 1973
10	5.0 inches	November 14, 2009
11	4.8 inches	May 17, 1916
12	4.7 inches	November 10, 1990
13	4.4 inches	September 16, 1999
14	4.4 inches	October 8, 2005
15	4.4 inches	June 18, 1922
16	4.3 inches	July 28, 1939
17	4.2 inches	April 21, 1991
18	4.1 inches	August 2, 1946
18	4.1 inches	June 17, 1917
20	4.0 inches	September 23, 1994