Weather on August 18
Philadelphia, PA
55 Years of Data
Avg High
85°F
Avg Low
70°F
Warmest
2002
89°F avg
Coldest
1979
64°F avg
About This Date
August 18th in Philadelphia, PA typically brings warm summer weather, with average highs around 85°F and lows near 70°F. Over 55 years of records, the warmest August 18th was in 2002 (89°F average), while the coldest was 1979 (64°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 24% of August 18th dates historically, with the wettest August 18th recording 3.3" of rain. The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Philadelphia, PA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 94° | 64° | 79° | 0.76" | — |
| 2024 | 78° | 72° | 75° | — | — |
| 2023 | 91° | 69° | 80° | — | — |
| 2022 | 85° | 65° | 75° | — | — |
| 2021 | 85° | 75° | 80° | 0.25" | — |
| 2020 | 86° | 68° | 77° | — | — |
| 2019 | 91° | 77° | 84° | — | — |
| 2018 | 94° | 75° | 84° | 0.48" | — |
| 2017 | 91° | 71° | 81° | — | — |
| 2016 | 91° | 77° | 84° | 0.48" | — |
| 2015 | 95° | 74° | 84° | — | — |
| 2014 | 84° | 64° | 74° | — | — |
| 2013 | 82° | 67° | 74° | 0.13" | — |
| 2012 | 91° | 65° | 78° | 2.67" | — |
| 2011 | 88° | 68° | 78° | 0.74" | — |
| 2010 | 91° | 70° | 80° | 0.05" | — |
| 2009 | 91° | 73° | 82° | 0.84" | — |
| 2008 | 90° | 72° | 81° | — | — |
| 2007 | 79° | 63° | 71° | — | — |
| 2006 | 86° | 72° | 79° | — | — |
| 2005 | 89° | 75° | 82° | — | — |
| 2004 | 86° | 73° | 80° | — | — |
| 2003 | 89° | 70° | 79° | — | — |
| 2002warmest | 97° | 81° | 89° | — | — |
| 2001 | 87° | 71° | 79° | — | — |
| 2000 | 70° | 64° | 67° | 0.28" | — |
| 1999 | 90° | 75° | 82° | — | — |
| 1998 | 92° | 68° | 80° | 1.02" | — |
| 1997 | 85° | 62° | 73° | 0.1" | — |
| 1996 | 86° | 68° | 77° | — | — |
| 1995 | 91° | 74° | 82° | — | — |
| 1994 | 78° | 70° | 74° | 3.3" | — |
| 1993 | 82° | 71° | 77° | — | — |
| 1992 | 80° | 67° | 73° | — | — |
| 1991 | 89° | 73° | 81° | — | — |
| 1990 | 88° | 73° | 80° | — | — |
| 1989 | 74° | 67° | 70° | — | — |
| 1988 | 85° | 72° | 78° | — | — |
| 1987 | 91° | 79° | 85° | — | — |
| 1986 | 85° | 73° | 79° | — | — |
| 1985 | 75° | 68° | 72° | — | — |
| 1984 | 82° | 67° | 74° | — | — |
| 1983 | 87° | 71° | 79° | — | — |
| 1982 | 81° | 64° | 72° | — | — |
| 1981 | 84° | 60° | 72° | — | — |
| 1980 | 72° | 67° | 69° | — | — |
| 1979coldest | 68° | 60° | 64° | — | — |
| 1978 | 83° | 70° | 76° | — | — |
| 1977 | 77° | 65° | 71° | — | — |
| 1976 | 84° | 67° | 75° | — | — |
| 1975 | 86° | 70° | 78° | — | — |
| 1974 | 84° | 70° | 77° | — | — |
| 1973 | 76° | 70° | 73° | — | — |
| 1972 | 86° | 65° | 75° | — | — |
| 1971 | 86° | 69° | 78° | — | — |
55 years of data from PHILADELPHIA WSFO