Weather on August 18
Mission Viejo, CA
55 Years of Data
Avg High
83°F
Avg Low
63°F
Warmest
2020
86°F avg
Coldest
1987
65°F avg
About This Date
August 18th in Mission Viejo, CA typically brings warm summer weather, with average highs around 83°F and lows near 63°F. Over 55 years of records, the warmest August 18th was in 2020 (86°F average), while the coldest was 1987 (65°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 18th dates historically. 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 August 18th in Mission Viejo, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 62° | 73° | — | — |
| 2024 | 83° | 59° | 71° | — | — |
| 2023 | 89° | 58° | 73° | — | — |
| 2022 | 87° | 63° | 75° | — | — |
| 2021 | 73° | 66° | 70° | — | — |
| 2020warmest | 106° | 66° | 86° | — | — |
| 2019 | 80° | 60° | 70° | — | — |
| 2018 | 84° | 66° | 75° | — | — |
| 2017 | 80° | 62° | 71° | — | — |
| 2016 | 86° | 57° | 72° | — | — |
| 2015 | 82° | 64° | 73° | — | — |
| 2014 | 86° | 61° | 73° | — | — |
| 2013 | 80° | 57° | 69° | — | — |
| 2012 | 91° | 69° | 80° | — | — |
| 2011 | 83° | 55° | 69° | — | — |
| 2010 | 96° | 69° | 83° | — | — |
| 2009 | 81° | 59° | 70° | — | — |
| 2008 | 83° | 61° | 72° | — | — |
| 2007 | 96° | 63° | 79° | — | — |
| 2006 | 86° | 58° | 72° | — | — |
| 2005 | 82° | 57° | 70° | — | — |
| 2004 | 83° | 59° | 71° | — | — |
| 2003 | 87° | 63° | 75° | — | — |
| 2002 | 77° | 62° | 70° | — | — |
| 2001 | 95° | 62° | 79° | — | — |
| 2000 | 90° | 62° | 76° | — | — |
| 1999 | 88° | 59° | 73° | — | — |
| 1998 | 80° | 63° | 71° | — | — |
| 1997 | 84° | 61° | 72° | — | — |
| 1996 | 79° | 66° | 72° | — | — |
| 1995 | 85° | 60° | 72° | — | — |
| 1994 | 88° | 71° | 79° | — | — |
| 1993 | 81° | 63° | 72° | — | — |
| 1992 | 93° | 70° | 81° | — | — |
| 1991 | 81° | 65° | 73° | — | — |
| 1990 | 79° | 67° | 73° | — | — |
| 1989 | 77° | 63° | 70° | — | — |
| 1988 | 75° | 58° | 66° | — | — |
| 1987coldest | 73° | 58° | 65° | — | — |
| 1986 | 95° | 70° | 82° | — | — |
| 1985 | 79° | 62° | 70° | — | — |
| 1984 | 83° | 72° | 77° | — | — |
| 1983 | 74° | 70° | 72° | 0.18" | — |
| 1982 | 85° | 63° | 74° | — | — |
| 1981 | 81° | 68° | 74° | — | — |
| 1980 | 75° | 67° | 71° | — | — |
| 1979 | 76° | 67° | 71° | — | — |
| 1978 | 80° | 57° | 69° | — | — |
| 1977 | 77° | 68° | 73° | 0.05" | — |
| 1976 | 78° | 60° | 69° | — | — |
| 1975 | 77° | 58° | 67° | — | — |
| 1974 | 80° | 55° | 68° | — | — |
| 1973 | 87° | 61° | 74° | — | — |
| 1972 | 78° | 58° | 68° | — | — |
| 1971 | 81° | 64° | 72° | — | — |
55 years of data from EL TORO MCAS