Weather on September 1
Mission Viejo, CA
55 Years of Data
Avg High
86°F
Avg Low
63°F
Warmest
2002
89°F avg
Coldest
1973
67°F avg
About This Date
September 1st in Mission Viejo, CA typically brings warm fall weather, with average highs around 86°F and lows near 63°F. Over 55 years of records, the warmest September 1st was in 2002 (89°F average), while the coldest was 1973 (67°F) — a 22°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 September 1st in Mission Viejo, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 96° | 64° | 80° | — | — |
| 2024 | 87° | 60° | 74° | — | — |
| 2023 | 86° | 60° | 73° | — | — |
| 2022 | 100° | 70° | 85° | — | — |
| 2021 | 75° | 63° | 69° | — | — |
| 2020 | 80° | 61° | 70° | — | — |
| 2019 | 86° | 63° | 74° | — | — |
| 2018 | 78° | 61° | 69° | — | — |
| 2017 | 103° | 72° | 87° | — | — |
| 2016 | 81° | 61° | 71° | — | — |
| 2015 | 82° | 63° | 72° | — | — |
| 2014 | 84° | 61° | 72° | — | — |
| 2013 | 92° | 70° | 81° | — | — |
| 2012 | 94° | 64° | 79° | — | — |
| 2011 | 82° | 57° | 70° | — | — |
| 2010 | 86° | 57° | 72° | — | — |
| 2009 | 94° | 67° | 80° | — | — |
| 2008 | 83° | 61° | 72° | — | — |
| 2007 | 103° | 70° | 86° | — | — |
| 2006 | 98° | 60° | 79° | — | — |
| 2005 | 82° | 54° | 68° | — | — |
| 2004 | 95° | 66° | 81° | — | — |
| 2003 | 84° | 61° | 72° | — | — |
| 2002warmest | 107° | 72° | 89° | — | — |
| 2001 | 87° | 60° | 74° | — | — |
| 2000 | 77° | 58° | 67° | — | — |
| 1999 | 78° | 57° | 68° | — | — |
| 1998 | 94° | 72° | 83° | — | — |
| 1997 | 85° | 64° | 74° | — | — |
| 1996 | 86° | 64° | 75° | — | — |
| 1995 | 88° | 65° | 76° | — | — |
| 1994 | 82° | 66° | 74° | — | — |
| 1993 | 84° | 66° | 75° | — | — |
| 1992 | 80° | 65° | 72° | — | — |
| 1991 | 87° | 64° | 76° | — | — |
| 1990 | 80° | 62° | 71° | — | — |
| 1989 | 81° | 58° | 69° | — | — |
| 1988 | 78° | 61° | 69° | — | — |
| 1987 | 104° | 62° | 83° | — | — |
| 1986 | 78° | 64° | 71° | — | — |
| 1985 | 90° | 67° | 78° | — | — |
| 1984 | 84° | 66° | 75° | — | — |
| 1983 | 93° | 66° | 80° | — | — |
| 1982 | 98° | 64° | 81° | — | — |
| 1981 | 83° | 62° | 72° | — | — |
| 1980 | 79° | 63° | 71° | — | — |
| 1979 | 79° | 63° | 71° | — | — |
| 1978 | 82° | 64° | 73° | — | — |
| 1977 | 78° | 60° | 69° | — | — |
| 1976 | 81° | 65° | 73° | — | — |
| 1975 | 81° | 54° | 67° | — | — |
| 1974 | 85° | 57° | 71° | — | — |
| 1973coldest | 78° | 56° | 67° | — | — |
| 1972 | 79° | 63° | 71° | — | — |
| 1971 | 83° | 59° | 71° | — | — |
55 years of data from EL TORO MCAS