Weather on October 21
Philadelphia, PA
55 Years of Data
Avg High
66°F
Avg Low
49°F
Warmest
1984
75°F avg
Coldest
1974
41°F avg
About This Date
October 21st in Philadelphia, PA typically brings mild fall weather, with average highs around 66°F and lows near 49°F. Over 54 years of records, the warmest October 21st was in 1984 (75°F average), while the coldest was 1974 (41°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 19% of October 21st dates historically, with the wettest October 21st recording 3.56" of rain. The last decade has been 5.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.3°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Philadelphia, PA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 50° | 64° | — | — |
| 2024 | 79° | 53° | 66° | — | — |
| 2023 | 70° | 57° | 63° | 0.13" | — |
| 2022 | 62° | 44° | 53° | — | — |
| 2021 | 78° | 58° | 68° | — | — |
| 2020 | 73° | 58° | 65° | — | — |
| 2019 | 55° | 50° | 53° | 3.56" | — |
| 2018 | 66° | 44° | 55° | 0.2" | — |
| 2016 | 80° | 64° | 72° | — | — |
| 2015 | 69° | 50° | 60° | — | — |
| 2014 | 63° | 47° | 55° | — | — |
| 2013 | 64° | 49° | 56° | — | — |
| 2012 | 67° | 52° | 59° | — | — |
| 2011 | 58° | 45° | 51° | — | — |
| 2010 | 61° | 50° | 55° | — | — |
| 2009 | 75° | 55° | 65° | — | — |
| 2008 | 62° | 38° | 50° | — | — |
| 2007 | 78° | 52° | 65° | — | — |
| 2006 | 59° | 44° | 52° | — | — |
| 2005 | 54° | 52° | 53° | 1.12" | — |
| 2004 | 55° | 50° | 53° | 0.23" | — |
| 2003 | 70° | 57° | 63° | 0.05" | — |
| 2002 | 62° | 52° | 57° | — | — |
| 2001 | 77° | 54° | 65° | — | — |
| 2000 | 76° | 55° | 65° | — | — |
| 1999 | 62° | 45° | 53° | — | — |
| 1998 | 61° | 49° | 55° | — | — |
| 1997 | 58° | 47° | 52° | — | — |
| 1996 | 60° | 44° | 52° | 0.53" | — |
| 1995 | 75° | 46° | 61° | 1.52" | — |
| 1994 | 68° | 55° | 62° | 0.05" | — |
| 1993 | 76° | 56° | 66° | 0.61" | — |
| 1992 | 64° | 46° | 55° | — | — |
| 1991 | 60° | 44° | 52° | — | — |
| 1990 | 68° | 46° | 57° | — | — |
| 1989 | 53° | 41° | 47° | — | — |
| 1988 | 55° | 44° | 50° | — | — |
| 1987 | 61° | 44° | 52° | — | — |
| 1986 | 72° | 49° | 60° | — | — |
| 1985 | 62° | 52° | 57° | — | — |
| 1984warmest | 86° | 65° | 75° | — | — |
| 1983 | 60° | 43° | 51° | — | — |
| 1982 | 61° | 47° | 54° | — | — |
| 1981 | 70° | 48° | 59° | — | — |
| 1980 | 70° | 50° | 60° | — | — |
| 1979 | 82° | 63° | 72° | — | — |
| 1978 | 69° | 47° | 58° | — | — |
| 1977 | 69° | 47° | 58° | — | — |
| 1976 | 58° | 46° | 52° | — | — |
| 1975 | 72° | 48° | 60° | — | — |
| 1974coldest | 49° | 33° | 41° | — | — |
| 1973 | 56° | 51° | 53° | — | — |
| 1972 | 53° | 32° | 43° | — | — |
| 1971 | 72° | 54° | 63° | — | — |
54 years of data from PHILADELPHIA WSFO