Weather on September 1
Fullerton, CA
55 Years of Data
Avg High
88°F
Avg Low
65°F
Warmest
1982
89°F avg
Coldest
1973
66°F avg
About This Date
September 1st in Fullerton, CA typically brings warm fall weather, with average highs around 88°F and lows near 65°F. Over 55 years of records, the warmest September 1st was in 1982 (89°F average), while the coldest was 1973 (66°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 1st dates historically. The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Fullerton, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 69° | 80° | — | — |
| 2024 | 86° | 65° | 75° | — | — |
| 2023 | 88° | 69° | 78° | — | — |
| 2022 | 100° | 73° | 87° | — | — |
| 2021 | 79° | 66° | 72° | — | — |
| 2020 | 82° | 64° | 73° | 0.13" | — |
| 2019 | 89° | 67° | 78° | — | — |
| 2018 | 84° | 68° | 76° | — | — |
| 2017 | 104° | 74° | 89° | — | — |
| 2016 | 92° | 66° | 79° | — | — |
| 2015 | 83° | 69° | 76° | — | — |
| 2014 | 88° | 67° | 77° | — | — |
| 2013 | 92° | 73° | 82° | — | — |
| 2012 | 91° | 70° | 80° | 0.05" | — |
| 2011 | 83° | 63° | 73° | — | — |
| 2010 | 87° | 61° | 74° | — | — |
| 2009 | 96° | 73° | 85° | — | — |
| 2008 | 85° | 69° | 77° | — | — |
| 2007 | 102° | 73° | 88° | — | — |
| 2006 | 94° | 64° | 79° | — | — |
| 2005 | 86° | 62° | 74° | — | — |
| 2004 | 94° | 63° | 78° | — | — |
| 2003 | 86° | 66° | 76° | — | — |
| 2002 | 105° | 68° | 87° | — | — |
| 2001 | 86° | 62° | 74° | — | — |
| 2000 | 76° | 63° | 69° | — | — |
| 1999 | 80° | 61° | 70° | — | — |
| 1998 | 101° | 76° | 88° | — | — |
| 1997 | 88° | 64° | 76° | — | — |
| 1996 | 92° | 67° | 79° | — | — |
| 1995 | 95° | 66° | 81° | — | — |
| 1994 | 81° | 66° | 73° | — | — |
| 1993 | 86° | 66° | 76° | — | — |
| 1992 | 79° | 64° | 71° | — | — |
| 1991 | 88° | 62° | 75° | — | — |
| 1990 | 84° | 62° | 73° | — | — |
| 1989 | 87° | 58° | 72° | — | — |
| 1988 | 80° | 62° | 71° | — | — |
| 1987 | 98° | 65° | 81° | — | — |
| 1986 | 81° | 64° | 72° | — | — |
| 1985 | 87° | 69° | 78° | — | — |
| 1984 | 85° | 67° | 76° | — | — |
| 1983 | 87° | 66° | 77° | — | — |
| 1982warmest | 105° | 74° | 89° | — | — |
| 1981 | 82° | 61° | 71° | — | — |
| 1980 | 84° | 63° | 73° | — | — |
| 1979 | 85° | 53° | 69° | — | — |
| 1978 | 87° | 61° | 74° | — | — |
| 1977 | 82° | 57° | 70° | — | — |
| 1976 | 85° | 60° | 72° | — | — |
| 1975 | 84° | 52° | 68° | — | — |
| 1974 | 94° | 55° | 74° | — | — |
| 1973coldest | 81° | 52° | 66° | — | — |
| 1972 | 85° | 64° | 74° | — | — |
| 1971 | 87° | 56° | 71° | — | — |
55 years of data from ANAHEIM