Weather on September 4
Allentown, PA
55 Years of Data
Avg High
81°F
Avg Low
59°F
Warmest
1973
81°F avg
Coldest
1997
56°F avg
About This Date
September 4th in Allentown, PA typically brings warm fall weather, with average highs around 81°F and lows near 59°F. Over 55 years of records, the warmest September 4th was in 1973 (81°F average), while the coldest was 1997 (56°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 18% of September 4th dates historically, with the wettest September 4th recording 4.78" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for September 4th in Allentown, PA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 56° | 70° | 4.78" | — |
| 2024 | 77° | 46° | 62° | — | — |
| 2023 | 91° | 66° | 79° | — | — |
| 2022 | 89° | 66° | 78° | — | — |
| 2021 | 77° | 53° | 65° | — | — |
| 2020 | 82° | 62° | 72° | — | — |
| 2019 | 89° | 65° | 77° | — | — |
| 2018 | 93° | 69° | 81° | — | — |
| 2017 | 81° | 51° | 66° | — | — |
| 2016 | 83° | 52° | 67° | — | — |
| 2015 | 90° | 69° | 79° | 0.66" | — |
| 2014 | 90° | 57° | 73° | — | — |
| 2013 | 79° | 57° | 68° | — | — |
| 2012 | 83° | 69° | 76° | 2.64" | — |
| 2011 | 84° | 68° | 76° | 0.18" | — |
| 2010 | 78° | 52° | 65° | — | — |
| 2009 | 80° | 58° | 69° | — | — |
| 2008 | 92° | 60° | 76° | — | — |
| 2007 | 82° | 60° | 71° | — | — |
| 2006 | 75° | 51° | 63° | — | — |
| 2005 | 81° | 53° | 67° | — | — |
| 2004 | 84° | 58° | 71° | — | — |
| 2003 | 77° | 65° | 71° | 0.05" | — |
| 2002 | 86° | 63° | 74° | — | — |
| 2001 | 83° | 61° | 72° | 0.41" | — |
| 2000 | 86° | 61° | 73° | — | — |
| 1999 | 84° | 63° | 73° | — | — |
| 1998 | 82° | 58° | 70° | — | — |
| 1997coldest | 66° | 47° | 56° | — | — |
| 1996 | 79° | 67° | 73° | — | — |
| 1995 | 86° | 53° | 70° | — | — |
| 1994 | 73° | 50° | 62° | — | — |
| 1993 | 77° | 65° | 71° | 1.98" | — |
| 1992 | 84° | 64° | 74° | — | — |
| 1991 | 81° | 55° | 68° | 0.3" | — |
| 1990 | 77° | 55° | 66° | — | — |
| 1989 | 73° | 52° | 62° | — | — |
| 1988 | 69° | 60° | 65° | 4.72" | — |
| 1987 | 74° | 46° | 60° | — | — |
| 1986 | 70° | 63° | 66° | — | — |
| 1985 | 89° | 70° | 79° | — | — |
| 1984 | 73° | 57° | 65° | 1.22" | — |
| 1983 | 84° | 61° | 72° | — | — |
| 1982 | 71° | 51° | 61° | — | — |
| 1981 | 67° | 61° | 64° | — | — |
| 1980 | 90° | 60° | 75° | — | — |
| 1979 | 86° | 64° | 75° | — | — |
| 1978 | 77° | 58° | 67° | — | — |
| 1977 | 81° | 59° | 70° | — | — |
| 1976 | 77° | 54° | 65° | — | — |
| 1975 | 77° | 51° | 64° | — | — |
| 1974 | 68° | 50° | 59° | — | — |
| 1973warmest | 93° | 69° | 81° | — | — |
| 1972 | 75° | 53° | 64° | — | — |
| 1971 | 85° | 60° | 72° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP