Weather on July 21
Fullerton, CA
55 Years of Data
Avg High
86°F
Avg Low
64°F
Warmest
2016
85°F avg
Coldest
1991
66°F avg
About This Date
July 21st in Fullerton, CA typically brings warm summer weather, with average highs around 86°F and lows near 64°F. Over 55 years of records, the warmest July 21st was in 2016 (85°F average), while the coldest was 1991 (66°F) — a 19°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
Planning for July 21st in Fullerton, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 66° | 72° | — | — |
| 2024 | 88° | 68° | 78° | — | — |
| 2023 | 86° | 68° | 77° | — | — |
| 2022 | 92° | 68° | 80° | — | — |
| 2021 | 95° | 69° | 82° | — | — |
| 2020 | 85° | 64° | 74° | — | — |
| 2019 | 91° | 64° | 78° | — | — |
| 2018 | 91° | 68° | 80° | — | — |
| 2017 | 88° | 68° | 78° | — | — |
| 2016warmest | 100° | 69° | 85° | — | — |
| 2015 | 84° | 71° | 78° | — | — |
| 2014 | 84° | 65° | 74° | — | — |
| 2013 | 75° | 65° | 70° | — | — |
| 2012 | 89° | 64° | 77° | — | — |
| 2011 | 83° | 63° | 73° | — | — |
| 2010 | 78° | 65° | 71° | — | — |
| 2009 | 93° | 68° | 81° | — | — |
| 2008 | 86° | 61° | 73° | — | — |
| 2007 | 84° | 66° | 75° | — | — |
| 2006 | 97° | 71° | 84° | — | — |
| 2005 | 95° | 69° | 82° | — | — |
| 2004 | 92° | 68° | 80° | — | — |
| 2003 | 93° | 71° | 82° | — | — |
| 2002 | 76° | 60° | 68° | — | — |
| 2001 | 81° | 63° | 72° | — | — |
| 2000 | 86° | 65° | 75° | — | — |
| 1999 | 85° | 58° | 71° | — | — |
| 1998 | 82° | 65° | 73° | — | — |
| 1997 | 77° | 63° | 70° | — | — |
| 1996 | 86° | 61° | 73° | — | — |
| 1995 | 85° | 57° | 71° | — | — |
| 1994 | 81° | 64° | 72° | — | — |
| 1993 | 79° | 65° | 72° | — | — |
| 1992 | 84° | 66° | 75° | — | — |
| 1991coldest | 77° | 56° | 66° | — | — |
| 1990 | 88° | 66° | 77° | — | — |
| 1989 | 82° | 62° | 72° | — | — |
| 1988 | 91° | 71° | 81° | — | — |
| 1987 | 75° | 61° | 68° | — | — |
| 1986 | 83° | 64° | 73° | — | — |
| 1985 | 84° | 66° | 75° | — | — |
| 1984 | 81° | 66° | 73° | — | — |
| 1983 | 88° | 64° | 76° | — | — |
| 1982 | 98° | 61° | 79° | — | — |
| 1981 | 95° | 64° | 80° | — | — |
| 1980 | 89° | 57° | 73° | — | — |
| 1979 | 88° | 65° | 76° | — | — |
| 1978 | 83° | 52° | 67° | — | — |
| 1977 | 92° | 60° | 76° | — | — |
| 1976 | 82° | 64° | 73° | — | — |
| 1975 | 87° | 60° | 74° | — | — |
| 1974 | 89° | 60° | 75° | — | — |
| 1973 | 76° | 59° | 67° | — | — |
| 1972 | 83° | 60° | 71° | — | — |
| 1971 | 88° | 63° | 75° | — | — |
55 years of data from ANAHEIM