Weather on September 20
El Cajon, CA
55 Years of Data
Avg High
84°F
Avg Low
60°F
Warmest
2015
87°F avg
Coldest
1988
63°F avg
About This Date
September 20th in El Cajon, CA typically brings warm fall weather, with average highs around 84°F and lows near 60°F. Over 54 years of records, the warmest September 20th was in 2015 (87°F average), while the coldest was 1988 (63°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 20th dates historically, with the wettest September 20th recording 0.81" 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 September 20th in El Cajon, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 66° | 77° | — | — |
| 2024 | 72° | 61° | 66° | — | — |
| 2023 | 75° | 64° | 70° | — | — |
| 2022 | 84° | 58° | 71° | — | — |
| 2021 | 85° | 58° | 71° | — | — |
| 2020 | 86° | 64° | 75° | — | — |
| 2019 | 82° | 56° | 69° | — | — |
| 2018 | 79° | 63° | 71° | — | — |
| 2017 | 77° | 63° | 70° | — | — |
| 2016 | 78° | 72° | 75° | 0.76" | — |
| 2015warmest | 105° | 70° | 87° | — | — |
| 2014 | 81° | 69° | 75° | — | — |
| 2013 | 75° | 64° | 70° | — | — |
| 2012 | 91° | 64° | 78° | — | — |
| 2011 | 84° | 59° | 72° | — | — |
| 2010 | 85° | 54° | 69° | — | — |
| 2009 | 94° | 59° | 76° | — | — |
| 2008 | 91° | 61° | 76° | — | — |
| 2007 | 71° | 56° | 63° | — | — |
| 2006 | 85° | 57° | 71° | — | — |
| 2005 | 85° | — | — | — | — |
| 2004 | 78° | 59° | 69° | — | — |
| 2003 | 91° | 57° | 74° | — | — |
| 2002 | 94° | 58° | 76° | — | — |
| 2001 | 84° | 60° | 72° | — | — |
| 2000 | 86° | 66° | 76° | — | — |
| 1999 | 88° | 51° | 69° | — | — |
| 1998 | 73° | 65° | 69° | — | — |
| 1996 | 87° | 61° | 74° | — | — |
| 1995 | 88° | 58° | 73° | — | — |
| 1994 | 83° | 62° | 72° | — | — |
| 1993 | 71° | 60° | 66° | — | — |
| 1992 | 94° | 58° | 76° | — | — |
| 1991 | 87° | 64° | 76° | 0.81" | — |
| 1990 | 77° | 63° | 70° | — | — |
| 1989 | 79° | 50° | 64° | — | — |
| 1988coldest | 71° | 55° | 63° | — | — |
| 1987 | 85° | 58° | 71° | — | — |
| 1986 | 75° | 56° | 65° | — | — |
| 1985 | 84° | 54° | 69° | — | — |
| 1984 | 91° | 69° | 80° | — | — |
| 1983 | 90° | 70° | 80° | — | — |
| 1982 | 88° | 55° | 71° | — | — |
| 1981 | 94° | 63° | 78° | — | — |
| 1980 | 83° | 59° | 71° | — | — |
| 1979 | 93° | 68° | 81° | — | — |
| 1978 | 89° | 46° | 68° | — | — |
| 1977 | 82° | 54° | 68° | — | — |
| 1976 | 77° | 64° | 71° | — | — |
| 1975 | 91° | 60° | 76° | — | — |
| 1974 | 83° | 62° | 72° | — | — |
| 1973 | 80° | 60° | 70° | — | — |
| 1972 | 90° | 52° | 71° | — | — |
| 1971 | 81° | 61° | 71° | — | — |
54 years of data from GILLESPIE FLD