Weather on September 1
Irvine, CA
55 Years of Data
Avg High
88°F
Avg Low
61°F
Warmest
1995
89°F avg
Coldest
1979
65°F avg
About This Date
September 1st in Irvine, CA typically brings warm fall weather, with average highs around 88°F and lows near 61°F — a 27°F daily swing. Over 55 years of records, the warmest September 1st was in 1995 (89°F average), while the coldest was 1979 (65°F) — a 24°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 Irvine, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 96° | 66° | 81° | — | — |
| 2024 | 86° | 60° | 73° | — | — |
| 2023 | 83° | 60° | 71° | — | — |
| 2022 | 102° | 70° | 86° | — | — |
| 2021 | 77° | 64° | 71° | — | — |
| 2020 | 83° | 60° | 71° | — | — |
| 2019 | 92° | 60° | 76° | — | — |
| 2018 | 85° | 63° | 74° | — | — |
| 2017 | 103° | 66° | 84° | — | — |
| 2016 | 89° | 63° | 76° | — | — |
| 2015 | 87° | 65° | 76° | — | — |
| 2014 | 93° | 61° | 77° | — | — |
| 2013 | 94° | 60° | 77° | — | — |
| 2012 | 91° | 60° | 76° | — | — |
| 2011 | 85° | 53° | 69° | — | — |
| 2010 | 89° | 52° | 70° | — | — |
| 2009 | 98° | 67° | 82° | — | — |
| 2008 | 87° | 61° | 74° | — | — |
| 2007 | 104° | 69° | 87° | — | — |
| 2006 | 97° | 60° | 78° | — | — |
| 2005 | 86° | 59° | 73° | — | — |
| 2004 | 95° | 59° | 77° | — | — |
| 2003 | 86° | 58° | 72° | — | — |
| 2002 | 104° | 66° | 85° | — | — |
| 2001 | 88° | 64° | 76° | — | — |
| 2000 | 77° | 59° | 68° | — | — |
| 1999 | 81° | 62° | 71° | — | — |
| 1998 | 101° | 73° | 87° | — | — |
| 1997 | 98° | 64° | 81° | — | — |
| 1996 | 92° | 65° | 78° | — | — |
| 1995warmest | 95° | 82° | 89° | — | — |
| 1994 | 84° | 66° | 75° | — | — |
| 1993 | 86° | 62° | 74° | — | — |
| 1992 | 79° | 62° | 70° | — | — |
| 1991 | 86° | 58° | 72° | — | — |
| 1990 | 80° | 57° | 69° | — | — |
| 1989 | 85° | 52° | 68° | — | — |
| 1988 | 83° | 60° | 71° | — | — |
| 1987 | 102° | 62° | 82° | — | — |
| 1986 | 81° | 66° | 73° | — | — |
| 1985 | 90° | 64° | 77° | — | — |
| 1984 | 84° | 66° | 75° | — | — |
| 1983 | 91° | 62° | 77° | — | — |
| 1982 | 96° | 57° | 77° | — | — |
| 1981 | 78° | 60° | 69° | — | — |
| 1980 | 84° | — | — | — | — |
| 1979coldest | 87° | 42° | 65° | — | — |
| 1978 | 86° | 64° | 75° | — | — |
| 1977 | 80° | 58° | 69° | — | — |
| 1976 | 89° | 61° | 75° | — | — |
| 1975 | 81° | 51° | 66° | — | — |
| 1974 | 84° | 54° | 69° | — | — |
| 1973 | 77° | 57° | 67° | — | — |
| 1972 | 81° | 65° | 73° | — | — |
| 1971 | 82° | 57° | 70° | — | — |
55 years of data from IRVINE RCH