Weather on October 20
Mission Viejo, CA
55 Years of Data
Avg High
78°F
Avg Low
56°F
Warmest
1999
86°F avg
Coldest
2005
23°F avg
About This Date
October 20th in Mission Viejo, CA typically brings pleasant fall weather, with average highs around 78°F and lows near 56°F. Over 55 years of records, the warmest October 20th was in 1999 (86°F average), while the coldest was 2005 (23°F) — a 63°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 0.79" of rain. The last decade has been 9.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 9.5°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in Mission Viejo, CA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 61° | 74° | — | — |
| 2024 | 86° | 61° | 73° | — | — |
| 2023 | 96° | 65° | 80° | — | — |
| 2022 | 89° | 63° | 76° | — | — |
| 2021 | 75° | 51° | 63° | — | — |
| 2020 | 79° | 61° | 70° | — | — |
| 2019 | 83° | 56° | 69° | — | — |
| 2018 | 88° | 66° | 77° | — | — |
| 2017 | 69° | 59° | 64° | — | — |
| 2016 | 97° | 75° | 86° | — | — |
| 2015 | 75° | 58° | 66° | — | — |
| 2014 | 77° | 59° | 68° | — | — |
| 2013 | 77° | 53° | 65° | — | — |
| 2012 | 65° | 60° | 62° | — | — |
| 2011 | 72° | 53° | 62° | — | — |
| 2010 | 62° | 55° | 59° | — | — |
| 2009 | 75° | 56° | 65° | — | — |
| 2008 | 75° | 53° | 64° | — | — |
| 2007 | 77° | 55° | 66° | — | — |
| 2006 | 86° | 61° | 73° | — | — |
| 2005coldest | 79° | -32° | 23° | — | — |
| 2004 | 63° | 55° | 59° | — | — |
| 2003 | 98° | 70° | 84° | — | — |
| 2002 | 73° | 50° | 62° | — | — |
| 2001 | 77° | 53° | 65° | — | — |
| 2000 | 77° | 56° | 66° | — | — |
| 1999warmest | 100° | 72° | 86° | — | — |
| 1998 | 76° | 53° | 64° | — | — |
| 1997 | 72° | 59° | 65° | — | — |
| 1996 | 72° | 55° | 63° | — | — |
| 1995 | 74° | 59° | 66° | — | — |
| 1994 | 74° | 53° | 63° | — | — |
| 1993 | 89° | 57° | 73° | — | — |
| 1992 | 78° | 59° | 69° | — | — |
| 1991 | 80° | 60° | 70° | — | — |
| 1990 | 83° | 58° | 70° | — | — |
| 1989 | 72° | 62° | 67° | — | — |
| 1988 | 72° | 61° | 66° | — | — |
| 1987 | 70° | 52° | 61° | — | — |
| 1986 | 75° | 50° | 63° | — | — |
| 1985 | 75° | 56° | 65° | — | — |
| 1984 | 70° | 55° | 62° | — | — |
| 1983 | 78° | 59° | 69° | — | — |
| 1982 | 78° | 54° | 66° | — | — |
| 1981 | 84° | 57° | 71° | — | — |
| 1980 | 86° | 57° | 72° | — | — |
| 1979 | 68° | 57° | 63° | 0.79" | — |
| 1978 | 78° | 64° | 71° | 0.05" | — |
| 1977 | 68° | 55° | 62° | — | — |
| 1976 | 76° | 64° | 70° | — | — |
| 1975 | 72° | 54° | 63° | — | — |
| 1974 | 71° | 54° | 62° | — | — |
| 1973 | 75° | 51° | 63° | — | — |
| 1972 | 68° | 57° | 63° | 0.03" | — |
| 1971 | 80° | 51° | 66° | — | — |
55 years of data from EL TORO MCAS