Weather on May 18
Fontana, CA
55 Years of Data
Avg High
80°F
Avg Low
54°F
Warmest
2008
85°F avg
Coldest
2011
55°F avg
About This Date
May 18th in Fontana, CA typically brings warm spring weather, with average highs around 80°F and lows near 54°F — a 26°F daily swing. Over 55 years of records, the warmest May 18th was in 2008 (85°F average), while the coldest was 2011 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 18th dates historically, with the wettest May 18th recording 0.53" of rain. The last decade has been 2.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.4°F cooler on this date compared to 20-30 years ago.
Planning for May 18th in Fontana, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 55° | 64° | — | — |
| 2024 | 76° | 54° | 65° | — | — |
| 2023 | 78° | 56° | 67° | — | — |
| 2022 | 83° | 56° | 69° | — | — |
| 2021 | 80° | 58° | 69° | — | — |
| 2020 | 69° | 58° | 63° | 0.33" | — |
| 2019 | 77° | 54° | 65° | — | — |
| 2018 | 74° | 57° | 65° | — | — |
| 2017 | 82° | 49° | 65° | — | — |
| 2016 | 82° | 59° | 71° | — | — |
| 2015 | 70° | 55° | 62° | — | — |
| 2014 | 82° | 59° | 71° | — | — |
| 2013 | 79° | 60° | 69° | — | — |
| 2012 | 76° | 58° | 67° | — | — |
| 2011coldest | 61° | 49° | 55° | 0.53" | — |
| 2010 | 69° | 53° | 61° | 0.03" | — |
| 2009 | 93° | 61° | 77° | — | — |
| 2008warmest | 101° | 69° | 85° | — | — |
| 2007 | 80° | 56° | 68° | — | — |
| 2006 | 82° | 61° | 71° | — | — |
| 2005 | 80° | 55° | 68° | — | — |
| 2004 | 77° | 60° | 69° | — | — |
| 2003 | 77° | 55° | 66° | — | — |
| 2002 | 75° | 55° | 65° | — | — |
| 2001 | 77° | 59° | 68° | — | — |
| 2000 | 88° | 51° | 69° | — | — |
| 1999 | 84° | 55° | 70° | — | — |
| 1998 | 84° | 50° | 67° | — | — |
| 1997 | 83° | 64° | 73° | — | — |
| 1996 | 86° | 57° | 72° | — | — |
| 1995 | 78° | 53° | 66° | — | — |
| 1994 | 66° | 47° | 56° | 0.03" | — |
| 1993 | 85° | 58° | 71° | — | — |
| 1992 | 89° | 58° | 73° | — | — |
| 1991 | 73° | 47° | 60° | — | — |
| 1990 | 78° | 56° | 67° | — | — |
| 1989 | 78° | 58° | 68° | — | — |
| 1988 | 83° | 33° | 58° | — | — |
| 1987 | 80° | 60° | 70° | — | — |
| 1986 | 99° | 54° | 76° | — | — |
| 1985 | 82° | 45° | 63° | — | — |
| 1984 | 90° | 48° | 69° | — | — |
| 1983 | 88° | 48° | 68° | — | — |
| 1982 | 88° | 52° | 70° | — | — |
| 1981 | 81° | 46° | 63° | — | — |
| 1980 | 87° | 51° | 69° | — | — |
| 1979 | 79° | 46° | 62° | — | — |
| 1978 | 93° | 45° | 69° | — | — |
| 1977 | 78° | 44° | 61° | — | — |
| 1976 | 89° | 54° | 71° | — | — |
| 1975 | 77° | 54° | 65° | — | — |
| 1974 | 70° | 50° | 60° | — | — |
| 1973 | 74° | 53° | 63° | — | — |
| 1972 | 75° | 57° | 66° | — | — |
| 1971 | 87° | 59° | 73° | — | — |
55 years of data from FONTANA KAISER