Weather on September 11
Allentown, PA
55 Years of Data
Avg High
78°F
Avg Low
56°F
Warmest
1983
81°F avg
Coldest
1994
56°F avg
About This Date
September 11th in Allentown, PA typically brings pleasant fall weather, with average highs around 78°F and lows near 56°F. Over 55 years of records, the warmest September 11th was in 1983 (81°F average), while the coldest was 1994 (56°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 11th dates historically, with the wettest September 11th recording 7.67" 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 11th in Allentown, PA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 54° | 66° | — | — |
| 2024 | 80° | 49° | 64° | — | — |
| 2023 | 80° | 63° | 71° | 0.15" | — |
| 2022 | 68° | 64° | 66° | 1.78" | — |
| 2021 | 76° | 49° | 62° | — | — |
| 2020 | 78° | 61° | 69° | — | — |
| 2019 | 91° | 63° | 77° | — | — |
| 2018 | 76° | 61° | 68° | 0.33" | — |
| 2017 | 77° | 45° | 61° | — | — |
| 2016 | 83° | 58° | 70° | — | — |
| 2015 | 82° | 60° | 71° | 0.03" | — |
| 2014 | 83° | 63° | 73° | 0.08" | — |
| 2013 | 93° | 70° | 81° | — | — |
| 2012 | 75° | 45° | 60° | — | — |
| 2011 | 72° | 64° | 68° | 0.03" | — |
| 2010 | 79° | 49° | 64° | — | — |
| 2009 | 60° | 54° | 57° | 2.95" | — |
| 2008 | 74° | 56° | 65° | — | — |
| 2007 | 75° | 62° | 69° | 0.86" | — |
| 2006 | 69° | 51° | 60° | — | — |
| 2005 | 81° | 50° | 65° | — | — |
| 2004 | 75° | 56° | 65° | — | — |
| 2003 | 81° | 52° | 66° | — | — |
| 2002 | 74° | 60° | 67° | — | — |
| 2001 | 79° | 53° | 66° | — | — |
| 2000 | 81° | 63° | 72° | — | — |
| 1999 | 77° | 53° | 65° | — | — |
| 1998 | 77° | 49° | 63° | — | — |
| 1997 | 74° | 64° | 69° | 7.67" | — |
| 1996 | 74° | 63° | 68° | — | — |
| 1995 | 74° | 39° | 56° | — | — |
| 1994coldest | 68° | 45° | 56° | — | — |
| 1993 | 68° | 49° | 58° | — | — |
| 1992 | 75° | 54° | 64° | 0.03" | — |
| 1991 | 79° | 59° | 69° | — | — |
| 1990 | 85° | 59° | 72° | — | — |
| 1989 | 86° | 65° | 75° | — | — |
| 1988 | 68° | 52° | 60° | — | — |
| 1987 | 80° | 57° | 69° | — | — |
| 1986 | 84° | 67° | 75° | — | — |
| 1985 | 69° | 50° | 60° | — | — |
| 1984 | 80° | 58° | 69° | — | — |
| 1983warmest | 96° | 66° | 81° | — | — |
| 1982 | 85° | 60° | 72° | — | — |
| 1981 | 83° | 57° | 70° | — | — |
| 1980 | 83° | 52° | 67° | — | — |
| 1979 | 77° | 56° | 66° | — | — |
| 1978 | 80° | 62° | 71° | — | — |
| 1977 | 72° | 52° | 62° | — | — |
| 1976 | 72° | 45° | 58° | — | — |
| 1975 | 72° | 48° | 60° | — | — |
| 1974 | 79° | 57° | 68° | 0.05" | — |
| 1973 | 80° | 50° | 65° | — | — |
| 1972 | 77° | 45° | 61° | — | — |
| 1971 | 77° | 69° | 73° | 1.27" | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP