Weather on September 15
Philadelphia, PA
55 Years of Data
Avg High
78°F
Avg Low
62°F
Warmest
2005
83°F avg
Coldest
1975
59°F avg
About This Date
September 15th in Philadelphia, PA typically brings pleasant fall weather, with average highs around 78°F and lows near 62°F. Over 55 years of records, the warmest September 15th was in 2005 (83°F average), while the coldest was 1975 (59°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 18% of September 15th dates historically, with the wettest September 15th recording 6.27" of rain. The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in Philadelphia, PA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 67° | 77° | — | — |
| 2024 | 87° | 67° | 77° | — | — |
| 2023 | 81° | 56° | 68° | — | — |
| 2022 | 82° | 65° | 73° | — | — |
| 2021 | 90° | 73° | 81° | — | — |
| 2020 | 77° | 56° | 66° | — | — |
| 2019 | 79° | 70° | 74° | 0.33" | — |
| 2018 | 75° | 68° | 72° | — | — |
| 2017 | 84° | 70° | 77° | — | — |
| 2016 | 77° | 65° | 71° | — | — |
| 2015 | 77° | 61° | 69° | — | — |
| 2014 | 71° | 52° | 61° | — | — |
| 2013 | 67° | 51° | 59° | — | — |
| 2012 | 82° | 63° | 72° | — | — |
| 2011 | 77° | 50° | 64° | 0.25" | — |
| 2010 | 80° | 60° | 70° | — | — |
| 2009 | 81° | 64° | 72° | — | — |
| 2008 | 84° | 62° | 73° | — | — |
| 2007 | 70° | 58° | 64° | — | — |
| 2006 | 75° | 66° | 71° | 0.15" | — |
| 2005warmest | 90° | 76° | 83° | 0.58" | — |
| 2004 | 71° | 63° | 67° | 0.3" | — |
| 2003 | 82° | 72° | 77° | 2.62" | — |
| 2002 | 81° | 72° | 76° | 0.51" | — |
| 2001 | 71° | 50° | 61° | — | — |
| 2000 | 74° | 58° | 66° | — | — |
| 1999 | 73° | 69° | 71° | 6.27" | — |
| 1998 | 88° | 72° | 80° | — | — |
| 1997 | 82° | 66° | 74° | — | — |
| 1996 | 75° | 60° | 68° | — | — |
| 1995 | 80° | 65° | 72° | — | — |
| 1994 | 87° | 67° | 77° | — | — |
| 1993 | 88° | 70° | 79° | — | — |
| 1992 | 78° | 59° | 69° | — | — |
| 1991 | 79° | 64° | 71° | — | — |
| 1990 | 77° | 63° | 70° | — | — |
| 1989 | 78° | 67° | 72° | — | — |
| 1988 | 71° | 60° | 66° | — | — |
| 1987 | 81° | 65° | 73° | — | — |
| 1986 | 80° | 62° | 71° | — | — |
| 1985 | 79° | 54° | 66° | — | — |
| 1984 | 72° | 54° | 63° | — | — |
| 1983 | 76° | 58° | 67° | — | — |
| 1982 | 85° | 65° | 75° | — | — |
| 1981 | 76° | 65° | 70° | — | — |
| 1980 | 73° | 62° | 68° | — | — |
| 1979 | 69° | 58° | 63° | — | — |
| 1978 | 73° | 58° | 65° | 0.05" | — |
| 1977 | 72° | 58° | 65° | — | — |
| 1976 | 76° | 66° | 71° | — | — |
| 1975coldest | 68° | 50° | 59° | — | — |
| 1974 | 73° | 54° | 63° | — | — |
| 1973 | 74° | 59° | 66° | 0.23" | — |
| 1972 | 79° | 60° | 69° | — | — |
| 1971 | 89° | 68° | 79° | — | — |
55 years of data from PHILADELPHIA CITY