Weather on December 18
El Cajon, CA
55 Years of Data
Avg High
69°F
Avg Low
42°F
Warmest
2025
64°F avg
Coldest
1989
48°F avg
About This Date
December 18th in El Cajon, CA typically brings mild winter weather, with average highs around 69°F and lows near 42°F — a 27°F daily swing. Over 54 years of records, the warmest December 18th was in 2025 (64°F average), while the coldest was 1989 (48°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 17% of December 18th dates historically, with the wettest December 18th recording 2.03" of rain. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for December 18th in El Cajon, CA? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 84° | 45° | 64° | — | — |
| 2024 | 83° | 41° | 62° | — | — |
| 2023 | 76° | 44° | 60° | — | — |
| 2022 | 65° | 41° | 53° | — | — |
| 2021 | 71° | 38° | 54° | — | — |
| 2020 | 70° | 43° | 56° | — | — |
| 2019 | 64° | 34° | 49° | — | — |
| 2018 | 69° | 48° | 59° | — | — |
| 2017 | 74° | 39° | 56° | — | — |
| 2016 | 65° | 32° | 48° | — | — |
| 2015 | 75° | 36° | 55° | — | — |
| 2014 | 64° | 48° | 56° | — | — |
| 2013 | 71° | 52° | 61° | — | — |
| 2012 | 59° | 53° | 56° | 0.58" | — |
| 2011 | 59° | 46° | 53° | — | — |
| 2010 | 62° | 55° | 59° | 0.76" | — |
| 2009 | 83° | 42° | 62° | — | — |
| 2008 | 61° | 45° | 53° | — | — |
| 2007 | 69° | 39° | 54° | — | — |
| 2006 | 59° | 41° | 50° | — | — |
| 2005 | 63° | 44° | 53° | — | — |
| 2004 | 80° | 39° | 60° | — | — |
| 2003 | 79° | 40° | 59° | — | — |
| 2002 | 60° | 46° | 53° | 0.33" | — |
| 2000 | 82° | 38° | 60° | — | — |
| 1999 | 75° | 51° | 63° | — | — |
| 1998 | 76° | 48° | 62° | — | — |
| 1997 | 68° | 47° | 57° | 0.25" | — |
| 1996 | 72° | 37° | 54° | — | — |
| 1995 | 69° | 35° | 52° | — | — |
| 1994 | 70° | 34° | 52° | — | — |
| 1993 | 65° | 36° | 50° | — | — |
| 1992 | 58° | 40° | 49° | — | — |
| 1991 | 59° | 54° | 56° | 1.14" | — |
| 1990 | 64° | 35° | 50° | — | — |
| 1989coldest | 58° | 38° | 48° | — | — |
| 1988 | 61° | 41° | 51° | 0.05" | — |
| 1987 | 64° | 50° | 57° | — | — |
| 1986 | 70° | 41° | 55° | — | — |
| 1985 | 79° | 37° | 58° | — | — |
| 1984 | 57° | 43° | 50° | 2.03" | — |
| 1983 | 72° | 40° | 56° | — | — |
| 1982 | 74° | 41° | 57° | — | — |
| 1981 | 77° | 41° | 59° | — | — |
| 1980 | 73° | 45° | 59° | — | — |
| 1979 | 80° | 38° | 59° | — | — |
| 1978 | 58° | 51° | 54° | 0.46" | — |
| 1977 | 63° | 55° | 59° | 1.45" | — |
| 1976 | 68° | 39° | 54° | — | — |
| 1975 | 71° | 31° | 51° | — | — |
| 1974 | 73° | 36° | 54° | — | — |
| 1973 | 70° | 49° | 59° | — | — |
| 1972 | 74° | 43° | 58° | — | — |
| 1971 | 66° | 38° | 52° | — | — |
54 years of data from GILLESPIE FLD