Weather on December 18
Costa Mesa, CA
55 Years of Data
Avg High
68°F
Avg Low
47°F
Warmest
1985
70°F avg
Coldest
1975
50°F avg
About This Date
December 18th in Costa Mesa, CA typically brings mild winter weather, with average highs around 68°F and lows near 47°F. Over 55 years of records, the warmest December 18th was in 1985 (70°F average), while the coldest was 1975 (50°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 20% of December 18th dates historically, with the wettest December 18th recording 2.92" 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 December 18th in Costa Mesa, CA? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 52° | 64° | — | — |
| 2024 | 80° | 52° | 66° | — | — |
| 2023 | 74° | 58° | 66° | 0.03" | — |
| 2022 | 64° | 45° | 54° | — | — |
| 2021 | 69° | 42° | 56° | — | — |
| 2020 | 73° | 49° | 61° | — | — |
| 2019 | 65° | 43° | 54° | — | — |
| 2018 | 67° | 54° | 60° | — | — |
| 2017 | 69° | 47° | 58° | — | — |
| 2016 | 66° | 38° | 52° | — | — |
| 2015 | 69° | 43° | 56° | — | — |
| 2014 | 65° | 52° | 58° | — | — |
| 2013 | 72° | 56° | 64° | — | — |
| 2012 | 61° | 50° | 55° | 0.33" | — |
| 2011 | 64° | 49° | 56° | — | — |
| 2010 | 63° | 58° | 60° | 0.89" | — |
| 2009 | 74° | 45° | 59° | — | — |
| 2008 | 57° | 42° | 50° | — | — |
| 2007 | 61° | 49° | 55° | 0.28" | — |
| 2006 | 60° | 42° | 51° | — | — |
| 2005 | 63° | 50° | 56° | — | — |
| 2004 | 83° | 45° | 64° | — | — |
| 2003 | 74° | 46° | 60° | — | — |
| 2002 | 62° | 42° | 52° | — | — |
| 2001 | 65° | 43° | 54° | — | — |
| 2000 | 81° | 47° | 64° | — | — |
| 1999 | 70° | 46° | 58° | — | — |
| 1998 | 66° | 54° | 60° | — | — |
| 1997 | 68° | 52° | 60° | 1.52" | — |
| 1996 | 72° | 36° | 54° | — | — |
| 1995 | 66° | 43° | 54° | — | — |
| 1994 | 68° | 44° | 56° | — | — |
| 1993 | 66° | 42° | 54° | — | — |
| 1992 | 61° | 46° | 53° | 0.33" | — |
| 1991 | 68° | 55° | 62° | — | — |
| 1990 | 65° | 42° | 53° | — | — |
| 1989 | 63° | 45° | 54° | — | — |
| 1988 | 62° | 45° | 53° | 1.02" | — |
| 1987 | 70° | 49° | 59° | 0.05" | — |
| 1986 | 69° | 48° | 59° | — | — |
| 1985warmest | 85° | 56° | 70° | — | — |
| 1984 | 57° | 43° | 50° | 1.52" | — |
| 1983 | 68° | 45° | 56° | — | — |
| 1982 | 71° | 43° | 57° | — | — |
| 1981 | 71° | 49° | 60° | — | — |
| 1980 | 77° | 52° | 64° | — | — |
| 1979 | 76° | 47° | 61° | — | — |
| 1978 | 59° | 48° | 54° | 2.92" | — |
| 1977 | 65° | 53° | 59° | 1.14" | — |
| 1976 | 71° | 47° | 59° | — | — |
| 1975coldest | 67° | 33° | 50° | — | — |
| 1974 | 75° | 42° | 59° | — | — |
| 1973 | 69° | 47° | 58° | — | — |
| 1972 | 75° | 45° | 60° | — | — |
| 1971 | 64° | 43° | 53° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP