Weather on August 20
Allentown, PA
55 Years of Data
Avg High
81°F
Avg Low
61°F
Warmest
1983
83°F avg
Coldest
1990
59°F avg
About This Date
August 20th in Allentown, PA typically brings warm summer weather, with average highs around 81°F and lows near 61°F. Over 55 years of records, the warmest August 20th was in 1983 (83°F average), while the coldest was 1990 (59°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 33% of August 20th dates historically, with the wettest August 20th recording 4.57" of rain. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Allentown, PA? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 69° | 58° | 63° | 1.22" | — |
| 2024 | 70° | 54° | 62° | — | — |
| 2023 | 82° | 55° | 69° | — | — |
| 2022 | 92° | 67° | 79° | — | — |
| 2021 | 82° | 69° | 76° | 0.03" | — |
| 2020 | 80° | 54° | 67° | — | — |
| 2019 | 92° | 68° | 80° | — | — |
| 2018 | 79° | 67° | 73° | 0.08" | — |
| 2017 | 83° | 61° | 72° | — | — |
| 2016 | 91° | 64° | 78° | — | — |
| 2015 | 88° | 72° | 80° | 3.58" | — |
| 2014 | 85° | 64° | 74° | 0.03" | — |
| 2013 | 86° | 60° | 73° | — | — |
| 2012 | 80° | 57° | 69° | 0.74" | — |
| 2011 | 86° | 58° | 72° | — | — |
| 2010 | 87° | 60° | 74° | — | — |
| 2009 | 86° | 67° | 76° | — | — |
| 2008 | 77° | 48° | 63° | — | — |
| 2007 | 64° | 59° | 62° | 1.65" | — |
| 2006 | 88° | 67° | 77° | 0.05" | — |
| 2005 | 84° | 69° | 77° | — | — |
| 2004 | 88° | 66° | 77° | 0.58" | — |
| 2003 | 87° | 60° | 74° | — | — |
| 2002 | 86° | 65° | 75° | 0.66" | — |
| 2001 | 84° | 64° | 74° | 0.1" | — |
| 2000 | 72° | 51° | 61° | — | — |
| 1999 | 70° | 60° | 65° | 0.66" | — |
| 1998 | 77° | 47° | 62° | — | — |
| 1997 | 66° | 56° | 61° | 4.57" | — |
| 1996 | 83° | 60° | 71° | — | — |
| 1995 | 87° | 54° | 70° | — | — |
| 1994 | 85° | 66° | 75° | 0.74" | — |
| 1993 | 80° | 67° | 73° | 0.23" | — |
| 1992 | 76° | 52° | 64° | — | — |
| 1991 | 72° | 65° | 68° | 1.85" | — |
| 1990coldest | 62° | 56° | 59° | 0.25" | — |
| 1989 | 82° | 65° | 73° | — | — |
| 1988 | 70° | 59° | 64° | — | — |
| 1987 | 81° | 62° | 71° | — | — |
| 1986 | 78° | 67° | 72° | — | — |
| 1985 | 79° | 69° | 74° | — | — |
| 1984 | 76° | 57° | 66° | — | — |
| 1983warmest | 96° | 70° | 83° | — | — |
| 1982 | 79° | 59° | 69° | — | — |
| 1981 | 80° | 54° | 67° | — | — |
| 1980 | 87° | 64° | 76° | — | — |
| 1979 | 82° | 58° | 70° | — | — |
| 1978 | 79° | 63° | 71° | — | — |
| 1977 | 73° | 55° | 64° | — | — |
| 1976 | 84° | 53° | 69° | — | — |
| 1975 | 78° | 62° | 70° | 0.15" | — |
| 1974 | 85° | 64° | 74° | — | — |
| 1973 | 77° | 63° | 70° | — | — |
| 1972 | 84° | 55° | 70° | — | — |
| 1971 | 83° | 65° | 74° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP