Weather on May 18
Fullerton, CA
55 Years of Data
Avg High
77°F
Avg Low
56°F
Warmest
2008
82°F avg
Coldest
1974
55°F avg
About This Date
May 18th in Fullerton, CA typically brings pleasant spring weather, with average highs around 77°F and lows near 56°F. Over 55 years of records, the warmest May 18th was in 2008 (82°F average), while the coldest was 1974 (55°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 5% of May 18th dates historically, with the wettest May 18th recording 0.84" of rain. 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 18th in Fullerton, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 59° | 65° | — | — |
| 2024 | 72° | 60° | 66° | — | — |
| 2023 | 74° | 62° | 68° | — | — |
| 2022 | 80° | 60° | 70° | — | — |
| 2021 | 78° | 61° | 69° | — | — |
| 2020 | 76° | 62° | 69° | 0.69" | — |
| 2019 | 73° | 52° | 62° | — | — |
| 2018 | 71° | 60° | 66° | — | — |
| 2017 | 80° | 53° | 67° | — | — |
| 2016 | 77° | 62° | 70° | — | — |
| 2015 | 71° | 57° | 64° | — | — |
| 2014 | 81° | 62° | 71° | — | — |
| 2013 | 75° | 62° | 69° | — | — |
| 2012 | 75° | 59° | 67° | — | — |
| 2011 | 65° | 52° | 58° | 0.84" | — |
| 2010 | 71° | 56° | 63° | — | — |
| 2009 | 85° | 60° | 72° | — | — |
| 2008warmest | 98° | 66° | 82° | — | — |
| 2007 | 75° | 59° | 67° | — | — |
| 2006 | 77° | 62° | 70° | — | — |
| 2005 | 80° | 58° | 69° | — | — |
| 2004 | 78° | 63° | 70° | — | — |
| 2003 | 79° | 58° | 68° | — | — |
| 2002 | 71° | 59° | 65° | — | — |
| 2001 | 74° | 61° | 67° | — | — |
| 2000 | 81° | 53° | 67° | — | — |
| 1999 | 80° | 51° | 66° | — | — |
| 1998 | 77° | 48° | 63° | — | — |
| 1997 | 79° | 65° | 72° | — | — |
| 1996 | 77° | 58° | 67° | — | — |
| 1995 | 74° | 57° | 65° | — | — |
| 1994 | 64° | 48° | 56° | 0.1" | — |
| 1993 | 78° | 57° | 68° | — | — |
| 1992 | 80° | 61° | 70° | — | — |
| 1991 | 70° | 51° | 60° | — | — |
| 1990 | 72° | 55° | 63° | — | — |
| 1989 | 70° | 60° | 65° | — | — |
| 1988 | 74° | 54° | 64° | — | — |
| 1987 | 73° | 61° | 67° | — | — |
| 1986 | 85° | 60° | 72° | — | — |
| 1985 | 71° | 52° | 61° | — | — |
| 1984 | 80° | 55° | 68° | — | — |
| 1983 | 88° | 58° | 73° | — | — |
| 1982 | 82° | 56° | 69° | — | — |
| 1981 | 82° | 50° | 66° | — | — |
| 1980 | 80° | 51° | 66° | — | — |
| 1979 | 75° | 49° | 62° | — | — |
| 1978 | 92° | 55° | 73° | — | — |
| 1977 | 74° | 45° | 59° | — | — |
| 1976 | 84° | 51° | 68° | — | — |
| 1975 | 74° | 50° | 62° | — | — |
| 1974coldest | 68° | 42° | 55° | — | — |
| 1973 | 77° | 56° | 66° | — | — |
| 1972 | 69° | 55° | 62° | — | — |
| 1971 | 88° | 47° | 67° | — | — |
55 years of data from ANAHEIM