Weather on September 12
Allentown, PA
55 Years of Data
Avg High
78°F
Avg Low
56°F
Warmest
1974
76°F avg
Coldest
1985
55°F avg
About This Date
September 12th 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 12th was in 1974 (76°F average), while the coldest was 1985 (55°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 12th dates historically, with the wettest September 12th recording 4.19" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for September 12th in Allentown, PA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 51° | 66° | — | — |
| 2024 | 81° | 52° | 66° | — | — |
| 2023 | 82° | 59° | 71° | — | — |
| 2022 | 81° | 65° | 73° | 0.03" | — |
| 2021 | 81° | 54° | 67° | — | — |
| 2020 | 74° | 54° | 64° | — | — |
| 2019 | 87° | 61° | 74° | 1.5" | — |
| 2018 | 79° | 70° | 74° | 0.05" | — |
| 2017 | 81° | 51° | 66° | — | — |
| 2016 | 81° | 50° | 65° | — | — |
| 2015 | 72° | 57° | 64° | 0.89" | — |
| 2014 | 75° | 53° | 64° | — | — |
| 2013 | 85° | 67° | 76° | 1.35" | — |
| 2012 | 80° | 47° | 63° | — | — |
| 2011 | 81° | 60° | 70° | 0.05" | — |
| 2010 | 66° | 58° | 62° | 1.19" | — |
| 2009 | 67° | 60° | 63° | 1.47" | — |
| 2008 | 68° | 64° | 66° | 1.4" | — |
| 2007 | 73° | 52° | 62° | — | — |
| 2006 | 69° | 47° | 58° | — | — |
| 2005 | 91° | 53° | 72° | — | — |
| 2004 | 77° | 53° | 65° | — | — |
| 2003 | 74° | 58° | 66° | — | — |
| 2002 | 75° | 47° | 61° | — | — |
| 2001 | 79° | 48° | 63° | — | — |
| 2000 | 83° | 69° | 76° | 0.28" | — |
| 1999 | 80° | 49° | 64° | — | — |
| 1998 | 87° | 56° | 71° | — | — |
| 1997 | 77° | 58° | 67° | — | — |
| 1996 | 71° | 62° | 67° | — | — |
| 1995 | 80° | 45° | 62° | — | — |
| 1994 | 78° | 49° | 63° | — | — |
| 1993 | 73° | 43° | 58° | — | — |
| 1992 | 71° | 46° | 59° | — | — |
| 1991 | 77° | 51° | 64° | — | — |
| 1990 | 82° | 63° | 72° | — | — |
| 1989 | 77° | 59° | 68° | — | — |
| 1988 | 74° | 48° | 61° | — | — |
| 1987 | 70° | 66° | 68° | 0.33" | — |
| 1986 | 81° | 64° | 72° | — | — |
| 1985coldest | 66° | 44° | 55° | — | — |
| 1984 | 78° | 58° | 68° | — | — |
| 1983 | 84° | 61° | 72° | 1.17" | — |
| 1982 | 86° | 55° | 71° | — | — |
| 1981 | 87° | 63° | 75° | — | — |
| 1980 | 86° | 61° | 73° | — | — |
| 1979 | 76° | 48° | 62° | — | — |
| 1978 | 86° | 61° | 73° | — | — |
| 1977 | 73° | 43° | 58° | — | — |
| 1976 | 84° | 47° | 65° | — | — |
| 1975 | 75° | 51° | 63° | 4.19" | — |
| 1974warmest | 83° | 69° | 76° | 0.03" | — |
| 1973 | 74° | 52° | 63° | — | — |
| 1972 | 73° | 61° | 67° | 0.13" | — |
| 1971 | 80° | 69° | 75° | 1.65" | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP