Weather on August 21
El Cajon, CA
55 Years of Data
Avg High
87°F
Avg Low
64°F
Warmest
1982
88°F avg
Coldest
2023
69°F avg
About This Date
August 21st in El Cajon, CA typically brings warm summer weather, with average highs around 87°F and lows near 64°F. Over 55 years of records, the warmest August 21st was in 1982 (88°F average), while the coldest was 2023 (69°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 21st dates historically, with the wettest August 21st recording 1.75" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for August 21st in El Cajon, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 66° | 80° | — | — |
| 2024 | 92° | 66° | 79° | — | — |
| 2023coldest | 74° | 65° | 69° | 1.75" | — |
| 2022 | 83° | 67° | 75° | — | — |
| 2021 | 78° | 64° | 71° | — | — |
| 2020 | 94° | 71° | 82° | — | — |
| 2019 | 94° | 60° | 77° | — | — |
| 2018 | 87° | 70° | 78° | — | — |
| 2017 | 84° | 66° | 75° | — | — |
| 2016 | 90° | 65° | 77° | — | — |
| 2015 | 83° | 69° | 76° | — | — |
| 2014 | 89° | 66° | 78° | — | — |
| 2013 | 92° | 62° | 77° | — | — |
| 2012 | 83° | 68° | 75° | — | — |
| 2011 | 81° | 60° | 70° | — | — |
| 2010 | 98° | 64° | 81° | — | — |
| 2009 | 84° | 64° | 74° | — | — |
| 2008 | 83° | 63° | 73° | — | — |
| 2007 | 88° | 65° | 76° | — | — |
| 2006 | 88° | 69° | 78° | — | — |
| 2005 | 82° | 61° | 71° | — | — |
| 2004 | 84° | 65° | 74° | — | — |
| 2003 | 89° | 68° | 79° | 0.03" | — |
| 2002 | 81° | 65° | 73° | — | — |
| 2001 | 85° | 62° | 73° | — | — |
| 2000 | 100° | 52° | 76° | — | — |
| 1999 | 88° | 60° | 74° | — | — |
| 1998 | 91° | 64° | 78° | — | — |
| 1997 | 93° | 68° | 81° | — | — |
| 1996 | 89° | 62° | 76° | — | — |
| 1995 | 86° | 66° | 76° | — | — |
| 1994 | 85° | 64° | 74° | — | — |
| 1993 | 88° | 58° | 73° | — | — |
| 1992 | 87° | 69° | 78° | — | — |
| 1991 | 85° | 65° | 75° | — | — |
| 1990 | 84° | 58° | 71° | — | — |
| 1989 | 79° | 64° | 71° | — | — |
| 1988 | 82° | 63° | 72° | — | — |
| 1987 | 81° | 62° | 71° | — | — |
| 1986 | 93° | 69° | 81° | — | — |
| 1985 | 86° | 59° | 73° | — | — |
| 1984 | 85° | 70° | 77° | — | — |
| 1983 | 83° | 66° | 74° | — | — |
| 1982warmest | 101° | 75° | 88° | — | — |
| 1981 | 98° | 66° | 82° | — | — |
| 1980 | 89° | 62° | 76° | — | — |
| 1979 | 84° | 65° | 74° | — | — |
| 1978 | 82° | 58° | 70° | — | — |
| 1977 | 79° | 66° | 72° | — | — |
| 1976 | 88° | 65° | 76° | — | — |
| 1975 | 80° | 63° | 71° | — | — |
| 1974 | 80° | 61° | 70° | — | — |
| 1973 | 93° | 67° | 80° | — | — |
| 1972 | 99° | 60° | 79° | — | — |
| 1971 | 82° | 67° | 74° | — | — |
55 years of data from GILLESPIE FLD