Weather on September 15
El Cajon, CA
55 Years of Data
Avg High
85°F
Avg Low
63°F
Warmest
1989
100°F avg
Coldest
1978
65°F avg
About This Date
September 15th in El Cajon, CA typically brings warm fall weather, with average highs around 85°F and lows near 63°F. Over 54 years of records, the warmest September 15th was in 1989 (100°F average), while the coldest was 1978 (65°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 15th dates historically, with the wettest September 15th recording 0.76" 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 15th in El Cajon, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 90° | 64° | 77° | — | — |
| 2024 | 72° | 64° | 68° | — | — |
| 2023 | 78° | 64° | 71° | — | — |
| 2022 | 80° | 61° | 70° | — | — |
| 2021 | 83° | 61° | 72° | — | — |
| 2020 | 98° | 60° | 79° | — | — |
| 2019 | 98° | 65° | 81° | — | — |
| 2018 | 91° | 60° | 76° | — | — |
| 2017 | 76° | 66° | 71° | — | — |
| 2016 | 84° | 53° | 69° | — | — |
| 2015 | 80° | 72° | 76° | 0.76" | — |
| 2014 | 102° | 73° | 88° | — | — |
| 2013 | 95° | 63° | 79° | — | — |
| 2012 | 103° | 66° | 84° | — | — |
| 2011 | 80° | 63° | 71° | — | — |
| 2010 | 88° | 58° | 73° | — | — |
| 2009 | 81° | 63° | 72° | — | — |
| 2008 | 96° | 61° | 78° | — | — |
| 2007 | 80° | 61° | 70° | — | — |
| 2006 | 73° | 58° | 65° | — | — |
| 2005 | 74° | 59° | 66° | — | — |
| 2004 | 83° | 67° | 75° | — | — |
| 2003 | 88° | 64° | 76° | — | — |
| 2002 | 96° | 60° | 78° | — | — |
| 2001 | 90° | 62° | 76° | — | — |
| 2000 | 97° | 64° | 80° | — | — |
| 1999 | 78° | 59° | 69° | — | — |
| 1998 | 76° | 64° | 70° | — | — |
| 1996 | 76° | 63° | 69° | — | — |
| 1995 | 90° | 62° | 76° | — | — |
| 1994 | 83° | 60° | 71° | — | — |
| 1993 | 71° | 63° | 67° | — | — |
| 1992 | 88° | 64° | 76° | — | — |
| 1991 | 78° | 62° | 70° | — | — |
| 1990 | 86° | 67° | 76° | — | — |
| 1989warmest | 108° | 93° | 100° | — | — |
| 1988 | 78° | 62° | 70° | — | — |
| 1987 | 86° | 56° | 71° | — | — |
| 1986 | 77° | 56° | 66° | — | — |
| 1985 | 85° | 54° | 69° | — | — |
| 1984 | 95° | 68° | 82° | — | — |
| 1983 | 92° | 62° | 77° | — | — |
| 1982 | 79° | 65° | 72° | — | — |
| 1981 | 92° | 60° | 76° | — | — |
| 1980 | 83° | 52° | 67° | — | — |
| 1979 | 104° | 70° | 87° | — | — |
| 1978coldest | 76° | 54° | 65° | — | — |
| 1977 | 79° | 64° | 71° | — | — |
| 1976 | 74° | 64° | 69° | — | — |
| 1975 | 91° | 63° | 77° | — | — |
| 1974 | 84° | 56° | 70° | — | — |
| 1973 | 79° | 63° | 71° | — | — |
| 1972 | 82° | 59° | 71° | — | — |
| 1971 | 81° | 67° | 74° | — | — |
54 years of data from GILLESPIE FLD