All-time weather records — South Portland, ME

Record high
102.9°F
August 2, 1975
Record low
-38.9°F
February 16, 1943
Wettest day
11.74 in
October 21, 1996

Climate change signal in South Portland

12.6%

of South Portland's all-time daily heat records were set in the last decade (46 of 366 records since 2015).

3%

of all-time daily cold records were set in the last decade (11 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1940s
70
72
1950s
41
113
1960s
25
86
1970s
35
42
1980s
38
24
1990s
50
9
2000s
36
7
2010s
43
10
2020s
28
3

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1941, the latest in 2026. Period of observation: 1940-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 66.9°F — Jan 6, 2007 -26.0°F — Jan 19, 1971 3.56 in — Jan 10, 1977
February 68.0°F — Feb 21, 2018 -38.9°F — Feb 16, 1943 3.83 in — Feb 25, 2010
March 88.0°F — Mar 31, 1998 -20.9°F — Mar 4, 1950 3.47 in — Mar 31, 1951
April 91.9°F — Apr 28, 2009 8.1°F — Apr 4, 1954 5.21 in — Apr 2, 1973
May 93.9°F — May 31, 1987 23.0°F — May 9, 1956 3.41 in — May 2, 2006
June 99.0°F — Jun 24, 2025 33.1°F — Jun 4, 1944 4.03 in — Jun 20, 1967
July 100.0°F — Jul 22, 2011 39.9°F — Jul 3, 1962 3.37 in — Jul 13, 1996
August 102.9°F — Aug 2, 1975 33.1°F — Aug 31, 1965 7.75 in — Aug 19, 1991
September 95.0°F — Sep 7, 1945 23.0°F — Sep 30, 1941 7.49 in — Sep 11, 1954
October 88.0°F — Oct 7, 1963 15.1°F — Oct 28, 1976 11.74 in — Oct 21, 1996
November 79.0°F — Nov 6, 2024 3.0°F — Nov 24, 1989 5.03 in — Nov 14, 2009
December 71.1°F — Dec 6, 2001 -20.9°F — Dec 31, 1963 3.50 in — Dec 4, 1990

Click a month to see every daily record for that month in South Portland.