Weather on September 20
Philadelphia, PA
55 Years of Data
Avg High
78°F
Avg Low
61°F
Warmest
1983
82°F avg
Coldest
1979
56°F avg
About This Date
September 20th in Philadelphia, PA typically brings pleasant fall weather, with average highs around 78°F and lows near 61°F. Over 55 years of records, the warmest September 20th was in 1983 (82°F average), while the coldest was 1979 (56°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 13% of September 20th dates historically, with the wettest September 20th recording 2.11" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 20th in Philadelphia, PA? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 63° | 76° | — | — |
| 2024 | 86° | 66° | 76° | — | — |
| 2023 | 88° | 56° | 72° | — | — |
| 2022 | 88° | 69° | 78° | — | — |
| 2021 | 82° | 65° | 73° | — | — |
| 2020 | 66° | 49° | 57° | — | — |
| 2019 | 73° | 56° | 64° | — | — |
| 2018 | 86° | 68° | 77° | — | — |
| 2017 | 79° | 70° | 74° | 0.3" | — |
| 2016 | 77° | 68° | 73° | 0.36" | — |
| 2015 | 86° | 67° | 76° | — | — |
| 2014 | 69° | 58° | 63° | — | — |
| 2013 | 77° | 60° | 69° | — | — |
| 2012 | 72° | 57° | 64° | — | — |
| 2011 | 71° | 63° | 67° | 0.08" | — |
| 2010 | 82° | 61° | 71° | — | — |
| 2009 | 75° | 57° | 66° | — | — |
| 2008 | 74° | 57° | 65° | — | — |
| 2007 | 77° | 61° | 69° | — | — |
| 2006 | 70° | 57° | 63° | — | — |
| 2005 | 85° | 71° | 78° | — | — |
| 2004 | 73° | 51° | 62° | — | — |
| 2003 | 86° | 69° | 78° | — | — |
| 2002 | 86° | 68° | 77° | — | — |
| 2001 | 73° | 69° | 71° | 1.42" | — |
| 2000 | 86° | 61° | 73° | — | — |
| 1999 | 77° | 61° | 69° | 2.11" | — |
| 1998 | 85° | 68° | 76° | — | — |
| 1997 | 86° | 61° | 73° | — | — |
| 1996 | 79° | 57° | 68° | — | — |
| 1995 | 77° | 62° | 70° | — | — |
| 1994 | 78° | 56° | 67° | — | — |
| 1993 | 68° | 44° | 56° | — | — |
| 1992 | 77° | 56° | 66° | — | — |
| 1991 | 65° | 54° | 59° | — | — |
| 1990 | 71° | 59° | 65° | — | — |
| 1989 | 83° | 73° | 78° | — | — |
| 1988 | 83° | 69° | 76° | — | — |
| 1987 | 65° | 57° | 61° | — | — |
| 1986 | 79° | 59° | 69° | — | — |
| 1985 | 87° | 66° | 77° | — | — |
| 1984 | 84° | 63° | 73° | — | — |
| 1983warmest | 92° | 73° | 82° | — | — |
| 1982 | 63° | 58° | 60° | — | — |
| 1981 | 74° | 58° | 66° | — | — |
| 1980 | 80° | 63° | 71° | — | — |
| 1979coldest | 66° | 47° | 56° | — | — |
| 1978 | 77° | 60° | 69° | — | — |
| 1977 | 81° | 59° | 70° | 0.1" | — |
| 1976 | 82° | 64° | 73° | 0.1" | — |
| 1975 | 82° | 71° | 77° | — | — |
| 1974 | 81° | 66° | 73° | — | — |
| 1973 | 75° | 55° | 65° | — | — |
| 1972 | 69° | 59° | 64° | — | — |
| 1971 | 82° | 66° | 74° | — | — |
55 years of data from PHILADELPHIA WSFO