Weather on October 20
Costa Mesa, CA
55 Years of Data
Avg High
78°F
Avg Low
58°F
Warmest
2022
80°F avg
Coldest
1971
60°F avg
About This Date
October 20th in Costa Mesa, CA typically brings pleasant fall weather, with average highs around 78°F and lows near 58°F. Over 55 years of records, the warmest October 20th was in 2022 (80°F average), while the coldest was 1971 (60°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 5% of October 20th dates historically, with the wettest October 20th recording 6.81" of rain. The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in Costa Mesa, CA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 57° | 70° | — | — |
| 2024 | 83° | 56° | 69° | — | — |
| 2023 | 88° | 65° | 76° | — | — |
| 2022warmest | 90° | 70° | 80° | — | — |
| 2021 | 74° | 55° | 64° | — | — |
| 2020 | 77° | 67° | 72° | — | — |
| 2019 | 80° | 59° | 70° | — | — |
| 2018 | 86° | 60° | 73° | — | — |
| 2017 | 73° | 63° | 68° | — | — |
| 2016 | 96° | 60° | 78° | — | — |
| 2015 | 77° | 63° | 70° | — | — |
| 2014 | 78° | 67° | 72° | — | — |
| 2013 | 74° | 60° | 67° | — | — |
| 2012 | 72° | 65° | 68° | — | — |
| 2011 | 69° | 59° | 64° | — | — |
| 2010 | 72° | 64° | 68° | 0.15" | — |
| 2009 | 73° | 60° | 67° | — | — |
| 2008 | 70° | 58° | 64° | — | — |
| 2007 | 70° | 58° | 64° | — | — |
| 2006 | 81° | 55° | 68° | — | — |
| 2005 | 72° | 56° | 64° | — | — |
| 2004 | 67° | 58° | 62° | 6.81" | — |
| 2003 | 87° | 61° | 74° | — | — |
| 2002 | 66° | 56° | 61° | — | — |
| 2001 | 71° | 59° | 65° | — | — |
| 2000 | 69° | 61° | 65° | — | — |
| 1999 | 94° | 56° | 75° | — | — |
| 1998 | 80° | 57° | 69° | — | — |
| 1997 | 74° | 62° | 68° | — | — |
| 1996 | 73° | 54° | 63° | — | — |
| 1995 | 77° | 60° | 69° | — | — |
| 1994 | 76° | 51° | 63° | — | — |
| 1993 | 89° | 54° | 71° | — | — |
| 1992 | 78° | 58° | 68° | — | — |
| 1991 | 79° | 58° | 68° | — | — |
| 1990 | 87° | 56° | 71° | — | — |
| 1989 | 77° | 64° | 71° | — | — |
| 1988 | 74° | 64° | 69° | — | — |
| 1987 | 74° | 55° | 64° | — | — |
| 1986 | 79° | 52° | 65° | — | — |
| 1985 | 75° | 57° | 66° | — | — |
| 1984 | 71° | 54° | 62° | — | — |
| 1983 | 79° | 65° | 72° | — | — |
| 1982 | 77° | 52° | 64° | — | — |
| 1981 | 84° | 59° | 72° | — | — |
| 1980 | 88° | 54° | 71° | — | — |
| 1979 | 73° | 57° | 65° | — | — |
| 1978 | 84° | 56° | 70° | — | — |
| 1977 | 69° | 56° | 62° | — | — |
| 1976 | 76° | 64° | 70° | — | — |
| 1975 | 75° | 56° | 65° | — | — |
| 1974 | 71° | 59° | 65° | — | — |
| 1973 | 89° | 55° | 72° | — | — |
| 1972 | 71° | 57° | 64° | 0.13" | — |
| 1971coldest | 77° | 43° | 60° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP