Weather on May 18
Allentown, PA
55 Years of Data
Avg High
71°F
Avg Low
50°F
Warmest
1977
78°F avg
Coldest
2002
44°F avg
About This Date
May 18th in Allentown, PA typically brings pleasant spring weather, with average highs around 71°F and lows near 50°F. Over 55 years of records, the warmest May 18th was in 1977 (78°F average), while the coldest was 2002 (44°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 47% of May 18th dates historically, with the wettest May 18th recording 3.35" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for May 18th in Allentown, PA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 57° | 64° | — | — |
| 2024 | 67° | 57° | 62° | 0.08" | — |
| 2023 | 66° | 32° | 49° | — | — |
| 2022 | 71° | 47° | 59° | 0.05" | — |
| 2021 | 81° | 46° | 63° | — | — |
| 2020 | 70° | 53° | 61° | — | — |
| 2019 | 78° | 55° | 67° | — | — |
| 2018 | 70° | 56° | 63° | — | — |
| 2017 | 92° | 65° | 78° | — | — |
| 2016 | 68° | 49° | 58° | — | — |
| 2015 | 83° | 57° | 70° | — | — |
| 2014 | 65° | 41° | 53° | — | — |
| 2013 | 68° | 54° | 61° | 0.03" | — |
| 2012 | 77° | 43° | 60° | — | — |
| 2011 | 69° | 59° | 64° | 1.45" | — |
| 2010 | 55° | 49° | 52° | 1.7" | — |
| 2009 | 57° | 37° | 47° | — | — |
| 2008 | 63° | 43° | 53° | 0.69" | — |
| 2007 | 61° | 45° | 53° | 0.2" | — |
| 2006 | 71° | 46° | 59° | 0.05" | — |
| 2005 | 70° | 45° | 57° | — | — |
| 2004 | 82° | 60° | 71° | 0.03" | — |
| 2003 | 66° | 40° | 53° | — | — |
| 2002coldest | 53° | 36° | 44° | 3.35" | — |
| 2001 | 59° | 53° | 56° | — | — |
| 2000 | 81° | 57° | 69° | 1.68" | — |
| 1999 | 76° | 47° | 61° | 0.08" | — |
| 1998 | 85° | 51° | 68° | — | — |
| 1997 | 65° | 37° | 51° | 0.41" | — |
| 1996 | 72° | 55° | 63° | — | — |
| 1995 | 75° | 55° | 65° | 0.28" | — |
| 1994 | 62° | 50° | 56° | 0.03" | — |
| 1993 | 67° | 46° | 56° | 0.23" | — |
| 1992 | 73° | 60° | 67° | 0.28" | — |
| 1991 | 70° | 52° | 61° | — | — |
| 1990 | 65° | 52° | 58° | — | — |
| 1989 | 84° | 53° | 69° | — | — |
| 1988 | 61° | 57° | 59° | 3.02" | — |
| 1987 | 89° | 54° | 71° | 0.28" | — |
| 1986 | 90° | 58° | 74° | — | — |
| 1985 | 68° | 50° | 59° | 0.86" | — |
| 1984 | 57° | 41° | 49° | — | — |
| 1983 | 65° | 35° | 50° | — | — |
| 1982 | 79° | 56° | 67° | — | — |
| 1981 | 64° | 46° | 55° | — | — |
| 1980 | 64° | 55° | 60° | 0.48" | — |
| 1979 | 65° | 46° | 55° | 0.64" | — |
| 1978 | 70° | 54° | 62° | 0.3" | — |
| 1977warmest | 91° | 64° | 78° | 1.09" | — |
| 1976 | 70° | 41° | 55° | 1.27" | — |
| 1975 | 70° | 57° | 63° | — | — |
| 1974 | 78° | 60° | 69° | — | — |
| 1973 | 56° | 40° | 48° | — | — |
| 1972 | 76° | 54° | 65° | 0.05" | — |
| 1971 | 79° | 46° | 62° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP