Weather on May 21
Philadelphia, PA
55 Years of Data
Avg High
75°F
Avg Low
57°F
Warmest
1996
81°F avg
Coldest
1994
49°F avg
About This Date
May 21st in Philadelphia, PA typically brings pleasant spring weather, with average highs around 75°F and lows near 57°F. Over 54 years of records, the warmest May 21st was in 1996 (81°F average), while the coldest was 1994 (49°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 22% of May 21st dates historically, with the wettest May 21st recording 2.11" of rain. The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Philadelphia, PA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 55° | 62° | — | — |
| 2024 | 78° | 56° | 67° | — | — |
| 2023 | 71° | 57° | 64° | 0.3" | — |
| 2022 | 88° | 56° | 72° | 1.52" | — |
| 2021 | 84° | 58° | 71° | — | — |
| 2019 | 89° | 71° | 80° | — | — |
| 2018 | 85° | 63° | 74° | 0.23" | — |
| 2017 | 79° | 57° | 68° | — | — |
| 2016 | 80° | 54° | 67° | — | — |
| 2015 | 67° | 54° | 60° | — | — |
| 2014 | 79° | 56° | 67° | 0.03" | — |
| 2013 | 81° | 67° | 74° | — | — |
| 2012 | 80° | 61° | 70° | 0.36" | — |
| 2011 | 81° | 60° | 70° | — | — |
| 2010 | 83° | 65° | 74° | — | — |
| 2009 | 82° | 61° | 71° | — | — |
| 2008 | 70° | 52° | 61° | — | — |
| 2007 | 72° | 54° | 63° | — | — |
| 2006 | 76° | 58° | 67° | — | — |
| 2005 | 78° | 47° | 62° | 0.3" | — |
| 2004 | 81° | 64° | 72° | 0.05" | — |
| 2003 | 63° | 58° | 60° | 1.24" | — |
| 2002 | 64° | 43° | 53° | — | — |
| 2001 | 59° | 53° | 56° | 2.06" | — |
| 2000 | 58° | 52° | 55° | 0.15" | — |
| 1999 | 83° | 54° | 68° | — | — |
| 1998 | 88° | 64° | 76° | — | — |
| 1997 | 65° | 50° | 57° | — | — |
| 1996warmest | 91° | 71° | 81° | — | — |
| 1995 | 79° | 54° | 66° | — | — |
| 1994coldest | 54° | 45° | 49° | — | — |
| 1993 | 68° | 48° | 58° | — | — |
| 1992 | 85° | 50° | 67° | — | — |
| 1991 | 78° | 53° | 66° | — | — |
| 1990 | 54° | 49° | 51° | — | — |
| 1989 | 83° | 67° | 75° | — | — |
| 1988 | 75° | 56° | 65° | — | — |
| 1987 | 76° | 52° | 64° | — | — |
| 1986 | 79° | 65° | 72° | — | — |
| 1985 | 82° | 64° | 73° | — | — |
| 1984 | 84° | 63° | 73° | — | — |
| 1983 | 77° | 62° | 70° | — | — |
| 1982 | 71° | 56° | 63° | — | — |
| 1981 | 76° | 55° | 65° | — | — |
| 1980 | 62° | 57° | 60° | — | — |
| 1979 | 65° | 54° | 59° | — | — |
| 1978 | 80° | 59° | 70° | — | — |
| 1977 | 86° | 64° | 75° | — | — |
| 1976 | 81° | 61° | 71° | 0.3" | — |
| 1975 | 85° | 65° | 75° | 2.11" | — |
| 1974 | 74° | 54° | 64° | — | — |
| 1973 | 62° | 57° | 60° | — | — |
| 1972 | 75° | 61° | 68° | — | — |
| 1971 | 59° | 54° | 56° | — | — |
54 years of data from PHILADELPHIA WSFO