Weather on September 1
Allentown, PA
55 Years of Data
Avg High
80°F
Avg Low
59°F
Warmest
1980
82°F avg
Coldest
2002
59°F avg
About This Date
September 1st in Allentown, PA typically brings warm fall weather, with average highs around 80°F and lows near 59°F. Over 55 years of records, the warmest September 1st was in 1980 (82°F average), while the coldest was 2002 (59°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 1st dates historically, with the wettest September 1st recording 10.54" 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 1st in Allentown, PA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 51° | 66° | — | — |
| 2024 | 85° | 66° | 75° | 0.05" | — |
| 2023 | 76° | 50° | 63° | — | — |
| 2022 | 83° | 59° | 71° | — | — |
| 2021 | 73° | 62° | 68° | 10.54" | — |
| 2020 | 75° | 65° | 70° | 0.03" | — |
| 2019 | 82° | 61° | 71° | — | — |
| 2018 | 79° | 69° | 74° | — | — |
| 2017 | 70° | 48° | 59° | — | — |
| 2016 | 83° | 64° | 73° | 0.51" | — |
| 2015 | 90° | 65° | 77° | — | — |
| 2014 | 88° | 70° | 79° | — | — |
| 2013 | 87° | 70° | 78° | 0.28" | — |
| 2012 | 91° | 65° | 78° | — | — |
| 2011 | 81° | 58° | 69° | — | — |
| 2010 | 95° | 62° | 79° | — | — |
| 2009 | 74° | 46° | 60° | — | — |
| 2008 | 86° | 52° | 69° | — | — |
| 2007 | 79° | 53° | 66° | — | — |
| 2006 | 66° | 57° | 62° | 0.58" | — |
| 2005 | 82° | 62° | 72° | — | — |
| 2004 | 80° | 54° | 67° | — | — |
| 2003 | 68° | 64° | 66° | 2.01" | — |
| 2002coldest | 63° | 56° | 59° | 2.39" | — |
| 2001 | 75° | 52° | 63° | — | — |
| 2000 | 83° | 71° | 77° | 1.07" | — |
| 1999 | 82° | 53° | 68° | — | — |
| 1998 | 81° | 58° | 69° | — | — |
| 1997 | 82° | 64° | 73° | 0.05" | — |
| 1996 | 84° | 51° | 68° | — | — |
| 1995 | 83° | 68° | 75° | — | — |
| 1994 | 78° | 59° | 69° | 0.03" | — |
| 1993 | 87° | 69° | 78° | — | — |
| 1992 | 76° | 51° | 63° | — | — |
| 1991 | 74° | 52° | 63° | — | — |
| 1990 | 82° | 58° | 70° | — | — |
| 1989 | 83° | 57° | 70° | — | — |
| 1988 | 79° | 54° | 66° | — | — |
| 1987 | 71° | 53° | 62° | 0.03" | — |
| 1986 | 73° | 47° | 60° | — | — |
| 1985 | 72° | 56° | 64° | — | — |
| 1984 | 77° | 58° | 67° | — | — |
| 1983 | 85° | 61° | 73° | — | — |
| 1982 | 75° | 68° | 72° | 0.28" | — |
| 1981 | 78° | 64° | 71° | — | — |
| 1980warmest | 97° | 68° | 82° | — | — |
| 1979 | 84° | 64° | 74° | — | — |
| 1978 | 82° | 60° | 71° | — | — |
| 1977 | 84° | 69° | 77° | — | — |
| 1976 | 81° | 48° | 64° | — | — |
| 1975 | 68° | 58° | 63° | 0.03" | — |
| 1974 | 81° | 67° | 74° | 2.18" | — |
| 1973 | 94° | 64° | 79° | 2.64" | — |
| 1972 | 80° | 60° | 70° | — | — |
| 1971 | 75° | 56° | 65° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP