Weather on March 18
Fontana, CA
55 Years of Data
Avg High
73°F
Avg Low
48°F
Warmest
2026
80°F avg
Coldest
2012
45°F avg
About This Date
March 18th in Fontana, CA typically brings pleasant spring weather, with average highs around 73°F and lows near 48°F — a 25°F daily swing. Over 56 years of records, the warmest March 18th was in 2026 (80°F average), while the coldest was 2012 (45°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 16% of March 18th dates historically, with the wettest March 18th recording 2.49" 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 March 18th in Fontana, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 97° | 64° | 80° | — | — |
| 2025 | 65° | 43° | 54° | — | — |
| 2024 | 77° | 46° | 62° | — | — |
| 2023 | 74° | 47° | 60° | — | — |
| 2022 | 80° | 50° | 65° | — | — |
| 2021 | 72° | 46° | 59° | — | — |
| 2020 | 58° | 42° | 50° | — | — |
| 2019 | 85° | 55° | 70° | — | — |
| 2018 | 63° | 43° | 53° | — | — |
| 2017 | 83° | 51° | 67° | — | — |
| 2016 | 79° | 52° | 65° | — | — |
| 2015 | 75° | 57° | 66° | — | — |
| 2014 | 80° | 53° | 67° | — | — |
| 2013 | 64° | 51° | 58° | — | — |
| 2012coldest | 52° | 39° | 45° | 0.43" | — |
| 2011 | 70° | 45° | 57° | — | — |
| 2010 | 77° | 51° | 64° | — | — |
| 2009 | 86° | 51° | 69° | — | — |
| 2008 | 74° | 46° | 60° | — | — |
| 2007 | 68° | 53° | 61° | — | — |
| 2006 | 56° | 43° | 49° | 0.28" | — |
| 2005 | 62° | 49° | 55° | 0.33" | — |
| 2004 | 86° | 53° | 70° | — | — |
| 2003 | 69° | 42° | 56° | — | — |
| 2002 | 64° | 40° | 52° | 0.15" | — |
| 2001 | 81° | 50° | 65° | — | — |
| 2000 | 83° | 46° | 64° | — | — |
| 1999 | 69° | 41° | 55° | — | — |
| 1998 | 74° | 55° | 64° | — | — |
| 1997 | 91° | 46° | 69° | — | — |
| 1996 | 78° | 51° | 65° | — | — |
| 1995 | 74° | 57° | 65° | — | — |
| 1994 | 80° | 49° | 64° | — | — |
| 1993 | 75° | 57° | 66° | — | — |
| 1992 | 69° | 49° | 59° | — | — |
| 1991 | 71° | 41° | 56° | — | — |
| 1990 | 85° | 45° | 65° | — | — |
| 1989 | 77° | 45° | 61° | — | — |
| 1988 | 85° | 43° | 64° | — | — |
| 1987 | 70° | 45° | 57° | — | — |
| 1986 | 70° | 38° | 54° | — | — |
| 1985 | 63° | 44° | 53° | 0.25" | — |
| 1984 | 80° | 57° | 69° | — | — |
| 1983 | 57° | 48° | 53° | 0.61" | — |
| 1982 | 55° | 38° | 46° | 2.49" | — |
| 1981 | 70° | 41° | 55° | — | — |
| 1980 | 73° | 40° | 56° | 0.03" | — |
| 1979 | 53° | 40° | 46° | 1.42" | — |
| 1978 | 92° | 54° | 73° | — | — |
| 1977 | 70° | 45° | 57° | — | — |
| 1976 | 78° | 54° | 66° | — | — |
| 1975 | 72° | 44° | 58° | — | — |
| 1974 | 79° | 51° | 65° | — | — |
| 1973 | 66° | 47° | 56° | — | — |
| 1972 | 73° | 53° | 63° | — | — |
| 1971 | 77° | 50° | 64° | — | — |
56 years of data from FONTANA KAISER