Weather on October 31
Costa Mesa, CA
55 Years of Data
Avg High
75°F
Avg Low
55°F
Warmest
2008
74°F avg
Coldest
1971
54°F avg
About This Date
October 31st in Costa Mesa, CA typically brings pleasant fall weather, with average highs around 75°F and lows near 55°F. Over 55 years of records, the warmest October 31st was in 2008 (74°F average), while the coldest was 1971 (54°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 11% of October 31st dates historically, with the wettest October 31st recording 1.7" of rain. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for October 31st in Costa Mesa, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 61° | 66° | — | — |
| 2024 | 72° | 53° | 62° | — | — |
| 2023 | 89° | 54° | 71° | — | — |
| 2022 | 78° | 57° | 68° | — | — |
| 2021 | 70° | 61° | 65° | — | — |
| 2020 | 76° | 57° | 66° | — | — |
| 2019 | 80° | 47° | 63° | — | — |
| 2018 | 79° | 58° | 68° | — | — |
| 2017 | 70° | 63° | 66° | — | — |
| 2016 | 70° | 58° | 64° | — | — |
| 2015 | 84° | 59° | 72° | — | — |
| 2014 | 73° | 63° | 68° | — | — |
| 2013 | 77° | 51° | 64° | — | — |
| 2012 | 72° | 59° | 65° | — | — |
| 2011 | 74° | 53° | 63° | — | — |
| 2010 | 74° | 58° | 66° | — | — |
| 2009 | 79° | 50° | 64° | — | — |
| 2008warmest | 84° | 65° | 74° | — | — |
| 2007 | 72° | 55° | 63° | 0.03" | — |
| 2006 | 68° | 59° | 64° | — | — |
| 2005 | 91° | 53° | 72° | — | — |
| 2004 | 69° | 51° | 60° | — | — |
| 2003 | 66° | 55° | 61° | 0.15" | — |
| 2002 | 66° | 54° | 60° | — | — |
| 2001 | 68° | 57° | 63° | — | — |
| 2000 | 67° | 52° | 59° | — | — |
| 1999 | 87° | 53° | 70° | — | — |
| 1998 | 73° | 54° | 63° | — | — |
| 1997 | 83° | 55° | 69° | — | — |
| 1996 | 64° | 47° | 55° | — | — |
| 1995 | 69° | 59° | 64° | — | — |
| 1994 | 80° | 52° | 66° | — | — |
| 1993 | 79° | 60° | 69° | — | — |
| 1992 | 75° | 56° | 65° | 0.05" | — |
| 1991 | 76° | 47° | 61° | — | — |
| 1990 | 75° | 55° | 65° | — | — |
| 1989 | 79° | 51° | 65° | — | — |
| 1988 | 81° | 55° | 68° | — | — |
| 1987 | 69° | 58° | 63° | 1.7" | — |
| 1986 | 73° | 61° | 67° | — | — |
| 1985 | 75° | 69° | 72° | — | — |
| 1984 | 71° | 55° | 63° | — | — |
| 1983 | 75° | 63° | 69° | — | — |
| 1982 | 73° | 56° | 64° | 0.15" | — |
| 1981 | 86° | 48° | 67° | — | — |
| 1980 | 87° | 59° | 73° | — | — |
| 1979 | 72° | 50° | 61° | — | — |
| 1978 | 72° | 54° | 63° | — | — |
| 1977 | 73° | 52° | 62° | — | — |
| 1976 | 81° | 45° | 63° | — | — |
| 1975 | 70° | 49° | 59° | — | — |
| 1974 | 69° | 49° | 59° | 0.03" | — |
| 1973 | 89° | 48° | 69° | — | — |
| 1972 | 71° | 44° | 58° | — | — |
| 1971coldest | 67° | 41° | 54° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP