Weather on September 17
Philadelphia, PA
55 Years of Data
Avg High
78°F
Avg Low
62°F
Warmest
1991
84°F avg
Coldest
1990
55°F avg
About This Date
September 17th 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 17th was in 1991 (84°F average), while the coldest was 1990 (55°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 15% of September 17th dates historically, with the wettest September 17th recording 6.81" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for September 17th in Philadelphia, PA? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 73° | 64° | 69° | — | — |
| 2024 | 77° | 66° | 72° | — | — |
| 2023 | 80° | 59° | 70° | — | — |
| 2022 | 80° | 64° | 72° | — | — |
| 2021 | 80° | 71° | 76° | — | — |
| 2020 | 77° | 65° | 71° | — | — |
| 2019 | 87° | 68° | 78° | — | — |
| 2018 | 87° | 69° | 78° | — | — |
| 2017 | 89° | 68° | 79° | 0.41" | — |
| 2016 | 79° | 61° | 70° | — | — |
| 2015 | 89° | 66° | 78° | — | — |
| 2014 | 74° | 56° | 65° | — | — |
| 2013 | 71° | 50° | 61° | 0.05" | — |
| 2012 | 77° | 59° | 68° | — | — |
| 2011 | 66° | 54° | 60° | — | — |
| 2010 | 85° | 67° | 76° | 1.45" | — |
| 2009 | 63° | 59° | 61° | — | — |
| 2008 | 77° | 61° | 69° | — | — |
| 2007 | 70° | 52° | 61° | — | — |
| 2006 | 82° | 66° | 74° | — | — |
| 2005 | 92° | 75° | 83° | 0.15" | — |
| 2004 | 76° | 58° | 67° | — | — |
| 2003 | 81° | 61° | 71° | — | — |
| 2002 | 84° | 65° | 74° | — | — |
| 2001 | 80° | 55° | 68° | — | — |
| 2000 | 72° | 51° | 61° | — | — |
| 1999 | 72° | 58° | 65° | — | — |
| 1998 | 76° | 68° | 72° | — | — |
| 1997 | 86° | 70° | 78° | — | — |
| 1996 | 65° | 58° | 61° | 6.81" | — |
| 1995 | 72° | 62° | 67° | 3.56" | — |
| 1994 | 83° | 68° | 75° | — | — |
| 1993 | 64° | 60° | 62° | 0.38" | — |
| 1992 | 85° | 65° | 75° | — | — |
| 1991warmest | 92° | 76° | 84° | — | — |
| 1990coldest | 61° | 50° | 55° | — | — |
| 1989 | 76° | 65° | 70° | — | — |
| 1988 | 68° | 57° | 63° | — | — |
| 1987 | 79° | 69° | 74° | — | — |
| 1986 | 73° | 48° | 61° | — | — |
| 1985 | 82° | 60° | 71° | — | — |
| 1984 | 74° | 53° | 63° | — | — |
| 1983 | 84° | 64° | 74° | — | — |
| 1982 | 70° | 59° | 64° | — | — |
| 1981 | 69° | 61° | 65° | — | — |
| 1980 | 83° | 63° | 73° | — | — |
| 1979 | 78° | 59° | 69° | — | — |
| 1978 | 80° | 63° | 71° | — | — |
| 1977 | 80° | 70° | 75° | 1.12" | — |
| 1976 | 82° | 69° | 76° | — | — |
| 1975 | 76° | 58° | 67° | — | — |
| 1974 | 76° | 64° | 70° | — | — |
| 1973 | 70° | 59° | 64° | — | — |
| 1972 | 90° | 67° | 78° | — | — |
| 1971 | 78° | 68° | 73° | — | — |
55 years of data from PHILADELPHIA CITY