Weather on September 17
Allentown, PA
55 Years of Data
Avg High
75°F
Avg Low
54°F
Warmest
1991
84°F avg
Coldest
1990
51°F avg
About This Date
September 17th in Allentown, PA typically brings pleasant fall weather, with average highs around 75°F and lows near 54°F. Over 55 years of records, the warmest September 17th was in 1991 (84°F average), while the coldest was 1990 (51°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 35% of September 17th dates historically, with the wettest September 17th recording 4.09" of rain. The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
Planning for September 17th in Allentown, PA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 60° | 67° | 0.03" | — |
| 2024 | 78° | 57° | 68° | — | — |
| 2023 | 73° | 48° | 61° | 0.58" | — |
| 2022 | 79° | 57° | 68° | — | — |
| 2021 | 76° | 65° | 70° | — | — |
| 2020 | 73° | 48° | 61° | — | — |
| 2019 | 80° | 57° | 69° | — | — |
| 2018 | 79° | 63° | 71° | 1.8" | — |
| 2017 | 82° | 64° | 73° | — | — |
| 2016 | 82° | 51° | 67° | — | — |
| 2015 | 86° | 53° | 70° | — | — |
| 2014 | 72° | 44° | 58° | — | — |
| 2013 | 66° | 41° | 54° | — | — |
| 2012 | 77° | 46° | 62° | — | — |
| 2011 | 62° | 48° | 55° | — | — |
| 2010 | 70° | 48° | 59° | — | — |
| 2009 | 65° | 53° | 59° | 0.46" | — |
| 2008 | 75° | 47° | 61° | — | — |
| 2007 | 70° | 39° | 54° | — | — |
| 2006 | 81° | 55° | 68° | — | — |
| 2005 | 83° | 64° | 73° | — | — |
| 2004 | 76° | 63° | 69° | 0.58" | — |
| 2003 | 77° | 51° | 64° | — | — |
| 2002 | 79° | 52° | 65° | — | — |
| 2001 | 77° | 43° | 60° | — | — |
| 2000 | 69° | 41° | 55° | — | — |
| 1999 | 70° | 49° | 59° | — | — |
| 1998 | 68° | 57° | 63° | 2.54" | — |
| 1997 | 79° | 54° | 66° | — | — |
| 1996 | 61° | 56° | 58° | 4.09" | — |
| 1995 | 73° | 58° | 65° | 2.01" | — |
| 1994 | 84° | 66° | 75° | 1.85" | — |
| 1993 | 65° | 56° | 60° | 0.94" | — |
| 1992 | 83° | 58° | 70° | — | — |
| 1991warmest | 93° | 75° | 84° | — | — |
| 1990coldest | 59° | 43° | 51° | 0.03" | — |
| 1989 | 75° | 60° | 68° | — | — |
| 1988 | 63° | 48° | 55° | 0.69" | — |
| 1987 | 78° | 65° | 71° | 2.9" | — |
| 1986 | 66° | 39° | 53° | — | — |
| 1985 | 75° | 45° | 60° | — | — |
| 1984 | 70° | 41° | 55° | — | — |
| 1983 | 78° | 56° | 67° | — | — |
| 1982 | 69° | 53° | 61° | — | — |
| 1981 | 64° | 57° | 61° | 0.74" | — |
| 1980 | 83° | 63° | 73° | 1.32" | — |
| 1979 | 77° | 50° | 64° | — | — |
| 1978 | 78° | 52° | 65° | — | — |
| 1977 | 81° | 65° | 73° | 0.48" | — |
| 1976 | 80° | 65° | 72° | 0.3" | — |
| 1975 | 73° | 48° | 61° | — | — |
| 1974 | 75° | 53° | 64° | 0.03" | — |
| 1973 | 66° | 51° | 59° | — | — |
| 1972 | 91° | 53° | 72° | — | — |
| 1971 | 75° | 60° | 68° | 0.03" | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP