Weather on September 4
Fullerton, CA
55 Years of Data
Avg High
90°F
Avg Low
65°F
Warmest
2022
95°F avg
Coldest
1973
65°F avg
About This Date
September 4th in Fullerton, CA typically brings hot fall weather, with average highs around 90°F and lows near 65°F — a 25°F daily swing. Over 55 years of records, the warmest September 4th was in 2022 (95°F average), while the coldest was 1973 (65°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 7% of September 4th dates historically, with the wettest September 4th recording 1.27" of rain. The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for September 4th in Fullerton, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 69° | 80° | — | — |
| 2024 | 100° | 67° | 83° | — | — |
| 2023 | 81° | 65° | 73° | — | — |
| 2022warmest | 107° | 82° | 95° | — | — |
| 2021 | 100° | 62° | 81° | — | — |
| 2020 | 94° | 66° | 80° | — | — |
| 2019 | 100° | 74° | 87° | — | — |
| 2018 | 81° | 71° | 76° | — | — |
| 2017 | 83° | 74° | 78° | 0.56" | — |
| 2016 | 82° | 65° | 73° | — | — |
| 2015 | 82° | 66° | 74° | — | — |
| 2014 | 85° | 69° | 77° | 1.27" | — |
| 2013 | 98° | 72° | 85° | — | — |
| 2012 | 96° | 67° | 81° | — | — |
| 2011 | 84° | 61° | 72° | — | — |
| 2010 | 97° | 62° | 79° | — | — |
| 2009 | 97° | 71° | 84° | — | — |
| 2008 | 95° | 66° | 81° | — | — |
| 2007 | 106° | 75° | 90° | — | — |
| 2006 | 98° | 69° | 84° | — | — |
| 2005 | 87° | 58° | 72° | — | — |
| 2004 | 93° | 61° | 77° | — | — |
| 2003 | 96° | 67° | 81° | — | — |
| 2002 | 90° | 65° | 77° | — | — |
| 2001 | 86° | 66° | 76° | — | — |
| 2000 | 83° | 57° | 70° | — | — |
| 1999 | 79° | 62° | 70° | — | — |
| 1998 | 95° | 70° | 82° | — | — |
| 1997 | 96° | 73° | 85° | — | — |
| 1996 | 83° | 67° | 75° | — | — |
| 1995 | 92° | 65° | 78° | — | — |
| 1994 | 85° | 64° | 74° | — | — |
| 1993 | 91° | 65° | 78° | — | — |
| 1992 | 82° | 61° | 71° | — | — |
| 1991 | 87° | 63° | 75° | — | — |
| 1990 | 91° | 61° | 76° | — | — |
| 1989 | 91° | 56° | 73° | — | — |
| 1988 | 108° | 74° | 91° | — | — |
| 1987 | 83° | 65° | 74° | — | — |
| 1986 | 82° | 62° | 72° | — | — |
| 1985 | 72° | 60° | 66° | 0.66" | — |
| 1984 | 100° | 68° | 84° | — | — |
| 1983 | 82° | 63° | 72° | — | — |
| 1982 | 100° | 63° | 81° | — | — |
| 1981 | 89° | 63° | 76° | — | — |
| 1980 | 86° | 56° | 71° | — | — |
| 1979 | 92° | 51° | 71° | — | — |
| 1978 | 95° | 67° | 81° | — | — |
| 1977 | 94° | 54° | 74° | — | — |
| 1976 | 93° | 63° | 78° | 0.18" | — |
| 1975 | 93° | 56° | 74° | — | — |
| 1974 | 94° | 60° | 77° | — | — |
| 1973coldest | 72° | 58° | 65° | — | — |
| 1972 | 82° | 59° | 71° | — | — |
| 1971 | 90° | 54° | 72° | — | — |
55 years of data from ANAHEIM