Weather on August 23
Fullerton, CA
55 Years of Data
Avg High
88°F
Avg Low
63°F
Warmest
2025
85°F avg
Coldest
2002
67°F avg
About This Date
August 23rd in Fullerton, CA typically brings warm summer weather, with average highs around 88°F and lows near 63°F — a 25°F daily swing. Over 55 years of records, the warmest August 23rd was in 2025 (85°F average), while the coldest was 2002 (67°F) — a 18°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for August 23rd in Fullerton, 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 |
|---|---|---|---|---|---|
| 2025warmest | 100° | 70° | 85° | — | — |
| 2024 | 82° | 65° | 73° | — | — |
| 2023 | 92° | 67° | 79° | — | — |
| 2022 | 89° | 67° | 78° | — | — |
| 2021 | 83° | 63° | 73° | — | — |
| 2020 | 93° | 76° | 84° | — | — |
| 2019 | 86° | 66° | 76° | — | — |
| 2018 | 87° | 70° | 78° | — | — |
| 2017 | 85° | 69° | 77° | — | — |
| 2016 | 87° | 65° | 76° | — | — |
| 2015 | 89° | 66° | 78° | — | — |
| 2014 | 86° | 65° | 75° | — | — |
| 2013 | 94° | 63° | 78° | — | — |
| 2012 | 84° | 70° | 77° | — | — |
| 2011 | 91° | 63° | 77° | — | — |
| 2010 | 97° | 62° | 79° | — | — |
| 2009 | 86° | 68° | 77° | — | — |
| 2008 | 87° | 66° | 77° | — | — |
| 2007 | 83° | 69° | 76° | — | — |
| 2006 | 96° | 67° | 81° | — | — |
| 2005 | 87° | 65° | 76° | — | — |
| 2004 | 80° | 63° | 71° | — | — |
| 2003 | 89° | 63° | 76° | — | — |
| 2002coldest | 81° | 53° | 67° | — | — |
| 2001 | 82° | 61° | 71° | — | — |
| 2000 | 86° | 65° | 75° | — | — |
| 1999 | 88° | 61° | 74° | — | — |
| 1998 | 96° | 67° | 81° | — | — |
| 1997 | 92° | 66° | 79° | — | — |
| 1996 | 91° | 63° | 77° | — | — |
| 1995 | 87° | 65° | 76° | — | — |
| 1994 | 83° | 62° | 72° | — | — |
| 1993 | 84° | 63° | 73° | — | — |
| 1992 | 91° | 61° | 76° | — | — |
| 1991 | 90° | 64° | 77° | — | — |
| 1990 | 84° | 64° | 74° | — | — |
| 1989 | 80° | 62° | 71° | — | — |
| 1988 | 84° | 61° | 72° | — | — |
| 1987 | 79° | 58° | 68° | — | — |
| 1986 | 82° | 60° | 71° | — | — |
| 1985 | 93° | 59° | 76° | — | — |
| 1984 | 85° | 68° | 76° | — | — |
| 1983 | 80° | 60° | 70° | — | — |
| 1982 | 84° | 60° | 72° | — | — |
| 1981 | 97° | 52° | 74° | — | — |
| 1980 | 85° | 64° | 74° | — | — |
| 1979 | 95° | 55° | 75° | — | — |
| 1978 | 85° | 53° | 69° | — | — |
| 1977 | 84° | 61° | 72° | — | — |
| 1976 | 92° | 56° | 74° | — | — |
| 1975 | 92° | 50° | 71° | — | — |
| 1974 | 90° | 56° | 73° | — | — |
| 1973 | 85° | 53° | 69° | — | — |
| 1972 | 98° | 60° | 79° | — | — |
| 1971 | 86° | 61° | 73° | — | — |
55 years of data from ANAHEIM