Weather on October 18
Costa Mesa, CA
55 Years of Data
Avg High
78°F
Avg Low
59°F
Warmest
2022
76°F avg
Coldest
1971
59°F avg
About This Date
October 18th in Costa Mesa, CA typically brings pleasant fall weather, with average highs around 78°F and lows near 59°F. Over 55 years of records, the warmest October 18th was in 2022 (76°F average), while the coldest was 1971 (59°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 7% of October 18th dates historically. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for October 18th in Costa Mesa, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 57° | 71° | — | — |
| 2024 | 77° | 59° | 68° | — | — |
| 2023 | 75° | 64° | 70° | — | — |
| 2022warmest | 87° | 65° | 76° | — | — |
| 2021 | 68° | 58° | 63° | — | — |
| 2020 | 80° | 67° | 73° | — | — |
| 2019 | 77° | 61° | 69° | — | — |
| 2018 | 91° | 57° | 74° | — | — |
| 2017 | 80° | 65° | 72° | — | — |
| 2016 | 73° | 59° | 66° | — | — |
| 2015 | 77° | 67° | 72° | — | — |
| 2014 | 78° | 66° | 72° | — | — |
| 2013 | 79° | 56° | 67° | — | — |
| 2012 | 81° | 69° | 75° | — | — |
| 2011 | 71° | 59° | 65° | — | — |
| 2010 | 70° | 64° | 67° | 0.2" | — |
| 2009 | 71° | 61° | 66° | — | — |
| 2008 | 79° | 57° | 68° | — | — |
| 2007 | 74° | 55° | 64° | — | — |
| 2006 | 85° | 55° | 70° | — | — |
| 2005 | 68° | 58° | 63° | 0.28" | — |
| 2004 | 72° | 63° | 67° | 0.03" | — |
| 2003 | 84° | 63° | 73° | — | — |
| 2002 | 65° | 60° | 62° | — | — |
| 2001 | 77° | 55° | 66° | 0.03" | — |
| 2000 | 72° | 61° | 66° | — | — |
| 1999 | 86° | 53° | 70° | — | — |
| 1998 | 88° | 53° | 70° | — | — |
| 1997 | 85° | 59° | 72° | — | — |
| 1996 | 74° | 60° | 67° | — | — |
| 1995 | 69° | 63° | 66° | — | — |
| 1994 | 78° | 52° | 65° | — | — |
| 1993 | 73° | 55° | 64° | — | — |
| 1992 | 76° | 61° | 68° | — | — |
| 1991 | 87° | 58° | 72° | — | — |
| 1990 | 78° | 62° | 70° | — | — |
| 1989 | 86° | 58° | 72° | — | — |
| 1988 | 79° | 62° | 70° | — | — |
| 1987 | 71° | 63° | 67° | — | — |
| 1986 | 71° | 54° | 62° | — | — |
| 1985 | 78° | 62° | 70° | — | — |
| 1984 | 73° | 60° | 67° | — | — |
| 1983 | 79° | 56° | 67° | — | — |
| 1982 | 73° | 59° | 66° | — | — |
| 1981 | 93° | 54° | 73° | — | — |
| 1980 | 85° | 47° | 66° | — | — |
| 1979 | 73° | 62° | 68° | — | — |
| 1978 | 77° | 57° | 67° | — | — |
| 1977 | 76° | 61° | 68° | — | — |
| 1976 | 79° | 61° | 70° | — | — |
| 1975 | 68° | 57° | 63° | — | — |
| 1974 | 90° | 58° | 74° | — | — |
| 1973 | 91° | 58° | 74° | — | — |
| 1972 | 72° | 59° | 65° | — | — |
| 1971coldest | 69° | 48° | 59° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP