Weather on September 18
El Cajon, CA
55 Years of Data
Avg High
85°F
Avg Low
61°F
Warmest
1984
84°F avg
Coldest
1993
64°F avg
About This Date
September 18th in El Cajon, CA typically brings warm fall weather, with average highs around 85°F and lows near 61°F. Over 54 years of records, the warmest September 18th was in 1984 (84°F average), while the coldest was 1993 (64°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 6% of September 18th dates historically. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in El Cajon, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 69° | 78° | 0.3" | — |
| 2024 | 75° | 57° | 66° | — | — |
| 2023 | 77° | 65° | 71° | — | — |
| 2022 | 80° | 60° | 70° | — | — |
| 2021 | 84° | 61° | 72° | — | — |
| 2020 | 104° | 62° | 83° | — | — |
| 2019 | 82° | 56° | 69° | — | — |
| 2018 | 90° | 57° | 73° | — | — |
| 2017 | 81° | 67° | 74° | — | — |
| 2016 | 91° | 56° | 73° | — | — |
| 2015 | 88° | 61° | 74° | — | — |
| 2014 | 86° | 71° | 79° | — | — |
| 2013 | 77° | 61° | 69° | — | — |
| 2012 | 90° | 63° | 76° | — | — |
| 2011 | 84° | 54° | 69° | — | — |
| 2010 | 87° | 53° | 70° | — | — |
| 2009 | 91° | 65° | 78° | — | — |
| 2008 | 91° | 65° | 78° | — | — |
| 2007 | 75° | 58° | 66° | — | — |
| 2006 | 95° | 54° | 74° | — | — |
| 2005 | 72° | 57° | 64° | — | — |
| 2004 | 87° | 67° | 77° | — | — |
| 2003 | 88° | 57° | 72° | — | — |
| 2002 | — | 59° | — | — | — |
| 2001 | 83° | 59° | 71° | — | — |
| 2000 | 96° | 66° | 81° | — | — |
| 1999 | 76° | 60° | 68° | — | — |
| 1998 | 78° | 61° | 69° | — | — |
| 1996 | 82° | 64° | 73° | — | — |
| 1995 | 84° | 63° | 73° | — | — |
| 1994 | 83° | 64° | 73° | — | — |
| 1993coldest | 76° | 53° | 64° | — | — |
| 1992 | 92° | 66° | 79° | — | — |
| 1991 | 85° | — | — | — | — |
| 1990 | 80° | 63° | 71° | — | — |
| 1989 | 75° | 55° | 65° | — | — |
| 1988 | 75° | 57° | 66° | — | — |
| 1987 | 83° | 59° | 71° | — | — |
| 1986 | 80° | 58° | 69° | — | — |
| 1985 | 69° | 60° | 65° | 0.48" | — |
| 1984warmest | 96° | 72° | 84° | — | — |
| 1983 | 97° | 62° | 79° | — | — |
| 1982 | 88° | 56° | 72° | 0.1" | — |
| 1981 | 95° | 68° | 82° | — | — |
| 1980 | 92° | 61° | 76° | — | — |
| 1979 | 98° | 68° | 83° | — | — |
| 1978 | 77° | 54° | 65° | — | — |
| 1977 | 84° | 52° | 68° | — | — |
| 1976 | 79° | 54° | 66° | — | — |
| 1975 | 93° | 66° | 80° | — | — |
| 1974 | 82° | 62° | 72° | — | — |
| 1973 | 80° | 56° | 68° | — | — |
| 1972 | 75° | 59° | 67° | — | — |
| 1971 | 85° | 69° | 77° | — | — |
54 years of data from GILLESPIE FLD