Weather on September 19
Allentown, PA
55 Years of Data
Avg High
75°F
Avg Low
53°F
Warmest
1977
74°F avg
Coldest
1990
50°F avg
About This Date
September 19th in Allentown, PA typically brings pleasant fall weather, with average highs around 75°F and lows near 53°F. Over 55 years of records, the warmest September 19th was in 1977 (74°F average), while the coldest was 1990 (50°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 35% of September 19th dates historically, with the wettest September 19th recording 4.09" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for September 19th in Allentown, PA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 55° | 69° | — | — |
| 2024 | 84° | 57° | 71° | — | — |
| 2023 | 71° | 51° | 61° | — | — |
| 2022 | 83° | 60° | 71° | 0.28" | — |
| 2021 | 78° | 55° | 67° | — | — |
| 2020 | 64° | 39° | 52° | — | — |
| 2019 | 73° | 45° | 59° | — | — |
| 2018 | 83° | 65° | 74° | — | — |
| 2017 | 82° | 66° | 74° | 0.05" | — |
| 2016 | 76° | 67° | 71° | 1.98" | — |
| 2015 | 84° | 55° | 70° | — | — |
| 2014 | 70° | 48° | 59° | — | — |
| 2013 | 76° | 42° | 59° | — | — |
| 2012 | 68° | 49° | 58° | 0.08" | — |
| 2011 | 69° | 46° | 58° | — | — |
| 2010 | 83° | 50° | 66° | — | — |
| 2009 | 72° | 47° | 59° | — | — |
| 2008 | 68° | 46° | 57° | — | — |
| 2007 | 78° | 43° | 60° | — | — |
| 2006 | 74° | 56° | 65° | 0.03" | — |
| 2005 | 84° | 56° | 70° | — | — |
| 2004 | 67° | 44° | 55° | — | — |
| 2003 | 81° | 66° | 73° | 2.08" | — |
| 2002 | 76° | 55° | 65° | — | — |
| 2001 | 80° | 50° | 65° | — | — |
| 2000 | 66° | 54° | 60° | 2.57" | — |
| 1999 | 74° | 45° | 59° | — | — |
| 1998 | 77° | 59° | 68° | — | — |
| 1997 | 80° | 50° | 65° | — | — |
| 1996 | 74° | 54° | 64° | — | — |
| 1995 | 74° | 47° | 60° | — | — |
| 1994 | 75° | 47° | 61° | — | — |
| 1993 | 68° | 45° | 56° | — | — |
| 1992 | 76° | 51° | 63° | 0.03" | — |
| 1991 | 71° | 54° | 62° | 0.91" | — |
| 1990coldest | 59° | 41° | 50° | 0.69" | — |
| 1989 | 65° | 58° | 61° | 4.09" | — |
| 1988 | 81° | 59° | 70° | — | — |
| 1987 | 58° | 54° | 56° | 0.18" | — |
| 1986 | 71° | 56° | 63° | 0.18" | — |
| 1985 | 84° | 54° | 69° | — | — |
| 1984 | 76° | 42° | 59° | — | — |
| 1983 | 93° | 56° | 74° | — | — |
| 1982 | 72° | 48° | 60° | — | — |
| 1981 | 67° | 51° | 59° | 0.64" | — |
| 1980 | 82° | 50° | 66° | — | — |
| 1979 | 67° | 48° | 57° | 0.18" | — |
| 1978 | 67° | 58° | 62° | 1.35" | — |
| 1977warmest | 83° | 65° | 74° | 0.43" | — |
| 1976 | 81° | 61° | 71° | — | — |
| 1975 | 68° | 59° | 64° | 1.35" | — |
| 1974 | 75° | 55° | 65° | — | — |
| 1973 | 67° | 45° | 56° | — | — |
| 1972 | 76° | 60° | 68° | 0.03" | — |
| 1971 | 68° | 61° | 64° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP