Weather on September 15
Allentown, PA
55 Years of Data
Avg High
75°F
Avg Low
54°F
Warmest
2005
78°F avg
Coldest
1975
50°F avg
About This Date
September 15th 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 15th was in 2005 (78°F average), while the coldest was 1975 (50°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 33% of September 15th dates historically, with the wettest September 15th recording 8.2" 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 15th in Allentown, PA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 56° | 68° | — | — |
| 2024 | 82° | 55° | 69° | — | — |
| 2023 | 75° | 51° | 63° | — | — |
| 2022 | 72° | 50° | 61° | — | — |
| 2021 | 88° | 66° | 77° | 0.86" | — |
| 2020 | 66° | 44° | 55° | — | — |
| 2019 | 83° | 59° | 71° | — | — |
| 2018 | 80° | 62° | 71° | — | — |
| 2017 | 84° | 62° | 73° | 0.97" | — |
| 2016 | 77° | 52° | 64° | — | — |
| 2015 | 83° | 49° | 66° | — | — |
| 2014 | 71° | 43° | 57° | — | — |
| 2013 | 72° | 41° | 56° | — | — |
| 2012 | 72° | 51° | 61° | 0.13" | — |
| 2011 | 67° | 47° | 57° | 0.79" | — |
| 2010 | 73° | 49° | 61° | — | — |
| 2009 | 78° | 54° | 66° | — | — |
| 2008 | 81° | 59° | 70° | — | — |
| 2007 | 68° | 47° | 57° | 0.03" | — |
| 2006 | 71° | 64° | 68° | 0.79" | — |
| 2005warmest | 88° | 69° | 78° | — | — |
| 2004 | 74° | 57° | 65° | 0.25" | — |
| 2003 | 80° | 67° | 73° | 8.2" | — |
| 2002 | 76° | 70° | 73° | 2.69" | — |
| 2001 | 70° | 40° | 55° | — | — |
| 2000 | 64° | 55° | 60° | 0.28" | — |
| 1999 | 70° | 65° | 67° | 3.15" | — |
| 1998 | 84° | 66° | 75° | — | — |
| 1997 | 77° | 53° | 65° | — | — |
| 1996 | 71° | 45° | 58° | — | — |
| 1995 | 74° | 48° | 61° | — | — |
| 1994 | 81° | 60° | 70° | — | — |
| 1993 | 88° | 67° | 77° | 2.29" | — |
| 1992 | 78° | 47° | 62° | — | — |
| 1991 | 78° | 67° | 72° | — | — |
| 1990 | 76° | 56° | 66° | 0.69" | — |
| 1989 | 76° | 64° | 70° | — | — |
| 1988 | 67° | 51° | 59° | — | — |
| 1987 | 77° | 50° | 64° | — | — |
| 1986 | 75° | 45° | 60° | — | — |
| 1985 | 72° | 40° | 56° | — | — |
| 1984 | 67° | 48° | 57° | 0.18" | — |
| 1983 | 71° | 46° | 59° | — | — |
| 1982 | 76° | 58° | 67° | — | — |
| 1981 | 70° | 60° | 65° | 0.84" | — |
| 1980 | 72° | 57° | 64° | — | — |
| 1979 | 71° | 53° | 62° | — | — |
| 1978 | 72° | 58° | 65° | 0.69" | — |
| 1977 | 71° | 51° | 61° | — | — |
| 1976 | 77° | 63° | 70° | 0.05" | — |
| 1975coldest | 63° | 38° | 50° | — | — |
| 1974 | 69° | 47° | 58° | — | — |
| 1973 | 73° | 55° | 64° | 0.03" | — |
| 1972 | 75° | 52° | 63° | — | — |
| 1971 | 81° | 63° | 72° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP