Weather on May 21
Fullerton, CA
55 Years of Data
Avg High
76°F
Avg Low
57°F
Warmest
2017
78°F avg
Coldest
1975
56°F avg
About This Date
May 21st in Fullerton, CA typically brings pleasant spring weather, with average highs around 76°F and lows near 57°F. Over 55 years of records, the warmest May 21st was in 2017 (78°F average), while the coldest was 1975 (56°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 21st dates historically. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 21st in Fullerton, CA? Great weather for outdoor activities.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 60° | 74° | — | — |
| 2024 | 72° | 58° | 65° | — | — |
| 2023 | 78° | 62° | 70° | — | — |
| 2022 | 74° | 62° | 68° | — | — |
| 2021 | 76° | 56° | 66° | — | — |
| 2020 | 85° | 57° | 71° | — | — |
| 2019 | 69° | 58° | 63° | — | — |
| 2018 | 68° | 59° | 64° | 0.05" | — |
| 2017warmest | 94° | 62° | 78° | — | — |
| 2016 | 70° | 54° | 62° | — | — |
| 2015 | 71° | 59° | 65° | — | — |
| 2014 | 74° | 57° | 65° | — | — |
| 2013 | 82° | 63° | 72° | — | — |
| 2012 | 84° | 59° | 72° | — | — |
| 2011 | 77° | 56° | 66° | — | — |
| 2010 | 78° | 57° | 68° | — | — |
| 2009 | 84° | 60° | 72° | — | — |
| 2008 | 74° | 61° | 67° | — | — |
| 2007 | 70° | 57° | 63° | — | — |
| 2006 | 77° | 62° | 70° | — | — |
| 2005 | 90° | 61° | 75° | — | — |
| 2004 | 72° | 63° | 67° | — | — |
| 2003 | 91° | 59° | 75° | — | — |
| 2002 | 67° | 49° | 58° | — | — |
| 2001 | 75° | 61° | 68° | — | — |
| 2000 | 86° | 58° | 72° | — | — |
| 1999 | 67° | 57° | 62° | — | — |
| 1998 | 70° | 56° | 63° | — | — |
| 1997 | 76° | 65° | 70° | — | — |
| 1996 | 75° | 60° | 68° | — | — |
| 1995 | 69° | 56° | 62° | — | — |
| 1994 | 77° | 51° | 64° | — | — |
| 1993 | 77° | 59° | 68° | — | — |
| 1992 | 74° | 58° | 66° | — | — |
| 1991 | 66° | 55° | 61° | — | — |
| 1990 | 74° | 55° | 64° | — | — |
| 1989 | 79° | 54° | 66° | — | — |
| 1988 | 84° | 62° | 73° | — | — |
| 1987 | 71° | 55° | 63° | — | — |
| 1986 | 73° | 60° | 67° | — | — |
| 1985 | 74° | 58° | 66° | — | — |
| 1984 | 74° | 58° | 66° | — | — |
| 1983 | 82° | 59° | 71° | — | — |
| 1982 | 68° | 58° | 63° | — | — |
| 1981 | 77° | 46° | 62° | — | — |
| 1980 | 71° | 55° | 63° | 0.15" | — |
| 1979 | 75° | 56° | 65° | — | — |
| 1978 | 77° | 55° | 66° | — | — |
| 1977 | 79° | 49° | 64° | — | — |
| 1976 | 76° | 51° | 63° | — | — |
| 1975coldest | 70° | 42° | 56° | — | — |
| 1974 | 86° | 47° | 66° | — | — |
| 1973 | 74° | 57° | 65° | — | — |
| 1972 | 71° | 43° | 57° | — | — |
| 1971 | 66° | 51° | 59° | — | — |
55 years of data from ANAHEIM