Weather on August 15
Fullerton, CA
55 Years of Data
Avg High
87°F
Avg Low
65°F
Warmest
2003
86°F avg
Coldest
1975
67°F avg
About This Date
August 15th in Fullerton, CA typically brings warm summer weather, with average highs around 87°F and lows near 65°F. Over 55 years of records, the warmest August 15th was in 2003 (86°F average), while the coldest was 1975 (67°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 15th dates historically, with the wettest August 15th recording 0.56" of rain. 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 15th in Fullerton, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 67° | 73° | — | — |
| 2024 | 90° | 66° | 78° | — | — |
| 2023 | 95° | 67° | 81° | — | — |
| 2022 | 93° | 69° | 81° | — | — |
| 2021 | 93° | 69° | 81° | — | — |
| 2020 | 99° | 74° | 86° | — | — |
| 2019 | 93° | 62° | 78° | — | — |
| 2018 | 88° | 70° | 79° | — | — |
| 2017 | 79° | 67° | 73° | — | — |
| 2016 | 102° | 69° | 86° | — | — |
| 2015 | 100° | 71° | 86° | — | — |
| 2014 | 95° | 64° | 80° | — | — |
| 2013 | 88° | 63° | 75° | — | — |
| 2012 | 91° | 67° | 79° | — | — |
| 2011 | 84° | 65° | 74° | — | — |
| 2010 | 84° | 58° | 71° | — | — |
| 2009 | 83° | 66° | 74° | — | — |
| 2008 | 84° | 68° | 76° | — | — |
| 2007 | 96° | 70° | 83° | — | — |
| 2006 | 83° | 63° | 73° | — | — |
| 2005 | 79° | 66° | 72° | — | — |
| 2004 | 82° | 67° | 74° | — | — |
| 2003warmest | 100° | 71° | 86° | — | — |
| 2002 | 81° | 64° | 72° | — | — |
| 2001 | 94° | 63° | 78° | — | — |
| 2000 | 90° | 68° | 79° | — | — |
| 1999 | 80° | 63° | 71° | — | — |
| 1998 | 86° | 68° | 77° | — | — |
| 1997 | 80° | 66° | 73° | — | — |
| 1996 | 95° | 69° | 82° | — | — |
| 1995 | 83° | 63° | 73° | — | — |
| 1994 | 93° | 71° | 82° | — | — |
| 1993 | 79° | 63° | 71° | — | — |
| 1992 | 97° | 72° | 84° | — | — |
| 1991 | 83° | 66° | 74° | — | — |
| 1990 | 77° | 67° | 72° | — | — |
| 1989 | 85° | 63° | 74° | — | — |
| 1988 | 81° | 58° | 69° | — | — |
| 1987 | 77° | 63° | 70° | — | — |
| 1986 | 79° | 61° | 70° | — | — |
| 1985 | 80° | 59° | 70° | — | — |
| 1984 | 87° | 68° | 78° | 0.56" | — |
| 1983 | 90° | 72° | 81° | 0.23" | — |
| 1982 | 79° | 59° | 69° | — | — |
| 1981 | 90° | 57° | 73° | — | — |
| 1980 | 82° | 65° | 73° | — | — |
| 1979 | 83° | 56° | 69° | — | — |
| 1978 | 88° | 56° | 72° | — | — |
| 1977 | 94° | 56° | 75° | — | — |
| 1976 | 75° | 60° | 68° | — | — |
| 1975coldest | 80° | 53° | 67° | — | — |
| 1974 | 84° | 61° | 72° | — | — |
| 1973 | 87° | 62° | 75° | — | — |
| 1972 | 80° | 57° | 69° | — | — |
| 1971 | 88° | 63° | 75° | — | — |
55 years of data from ANAHEIM