Weather on October 18
Fullerton, CA
55 Years of Data
Avg High
81°F
Avg Low
57°F
Warmest
2003
80°F avg
Coldest
1971
57°F avg
About This Date
October 18th in Fullerton, CA typically brings warm fall weather, with average highs around 81°F and lows near 57°F. Over 55 years of records, the warmest October 18th was in 2003 (80°F average), while the coldest was 1971 (57°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 5% of October 18th dates historically, with the wettest October 18th recording 0.86" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for October 18th in Fullerton, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 56° | 72° | — | — |
| 2024 | 77° | 59° | 68° | — | — |
| 2023 | 83° | 62° | 72° | — | — |
| 2022 | 96° | 63° | 79° | — | — |
| 2021 | 74° | 60° | 67° | — | — |
| 2020 | 86° | 62° | 74° | — | — |
| 2019 | 82° | 58° | 70° | — | — |
| 2018 | 88° | 57° | 72° | — | — |
| 2017 | 91° | 65° | 78° | — | — |
| 2016 | 78° | 57° | 68° | — | — |
| 2015 | 83° | 70° | 76° | — | — |
| 2014 | 80° | 64° | 72° | — | — |
| 2013 | 86° | 54° | 70° | — | — |
| 2012 | 79° | 72° | 75° | — | — |
| 2011 | 78° | 59° | 69° | — | — |
| 2010 | 67° | 60° | 63° | 0.25" | — |
| 2009 | 91° | 60° | 76° | — | — |
| 2008 | 90° | 56° | 73° | — | — |
| 2007 | 83° | 54° | 68° | — | — |
| 2006 | 87° | 53° | 70° | — | — |
| 2005 | 68° | 55° | 62° | 0.86" | — |
| 2004 | 72° | 63° | 67° | — | — |
| 2003warmest | 95° | 64° | 80° | — | — |
| 2002 | 67° | 56° | 61° | — | — |
| 2001 | 82° | 52° | 67° | — | — |
| 2000 | 78° | 59° | 69° | — | — |
| 1999 | 90° | 54° | 72° | — | — |
| 1998 | 89° | 57° | 73° | — | — |
| 1997 | 89° | 51° | 70° | — | — |
| 1996 | 78° | 57° | 68° | — | — |
| 1995 | 78° | 61° | 69° | — | — |
| 1994 | 76° | 53° | 64° | — | — |
| 1993 | 74° | 52° | 63° | — | — |
| 1992 | 78° | 59° | 69° | — | — |
| 1991 | 89° | 56° | 72° | — | — |
| 1990 | 79° | 59° | 69° | — | — |
| 1989 | 92° | 53° | 72° | — | — |
| 1988 | 79° | 62° | 70° | — | — |
| 1987 | 71° | 63° | 67° | — | — |
| 1986 | 71° | 54° | 62° | — | — |
| 1985 | 78° | 62° | 70° | — | — |
| 1984 | 73° | 60° | 67° | — | — |
| 1983 | 79° | 56° | 67° | — | — |
| 1982 | 86° | 52° | 69° | — | — |
| 1981 | 95° | 48° | 72° | — | — |
| 1980 | 87° | 43° | 65° | — | — |
| 1979 | 72° | 55° | 63° | — | — |
| 1978 | 82° | 51° | 67° | — | — |
| 1977 | 77° | 54° | 65° | — | — |
| 1976 | 76° | 60° | 68° | — | — |
| 1975 | 69° | 52° | 60° | — | — |
| 1974 | 88° | 50° | 69° | — | — |
| 1973 | 96° | 60° | 78° | — | — |
| 1972 | 70° | 54° | 62° | 0.08" | — |
| 1971coldest | 71° | 42° | 57° | — | — |
55 years of data from ANAHEIM