Weather on May 31
Fontana, CA
55 Years of Data
Avg High
84°F
Avg Low
57°F
Warmest
1972
81°F avg
Coldest
1980
57°F avg
About This Date
May 31st in Fontana, CA typically brings warm spring weather, with average highs around 84°F and lows near 57°F — a 27°F daily swing. Over 55 years of records, the warmest May 31st was in 1972 (81°F average), while the coldest was 1980 (57°F) — a 24°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
Planning for May 31st in Fontana, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 96° | 64° | 80° | — | — |
| 2024 | 80° | 57° | 69° | — | — |
| 2023 | 63° | 56° | 59° | — | — |
| 2022 | 82° | 55° | 69° | — | — |
| 2021 | 86° | 60° | 73° | — | — |
| 2020 | 87° | 59° | 73° | — | — |
| 2019 | 83° | 60° | 71° | — | — |
| 2018 | 76° | 57° | 66° | — | — |
| 2017 | 72° | 61° | 66° | — | — |
| 2016 | 80° | 55° | 68° | — | — |
| 2015 | 83° | 57° | 70° | — | — |
| 2014 | 90° | 60° | 75° | — | — |
| 2013 | 89° | 61° | 75° | — | — |
| 2012 | 94° | 57° | 75° | — | — |
| 2011 | 82° | 53° | 68° | — | — |
| 2010 | 82° | 56° | 69° | — | — |
| 2009 | 76° | 60° | 68° | — | — |
| 2008 | 79° | 54° | 66° | — | — |
| 2007 | 80° | 53° | 67° | — | — |
| 2006 | 96° | 62° | 79° | — | — |
| 2005 | 83° | 56° | 69° | — | — |
| 2004 | 94° | 60° | 77° | — | — |
| 2003 | 85° | 59° | 72° | — | — |
| 2002 | 89° | 58° | 73° | — | — |
| 2001 | 94° | 60° | 77° | — | — |
| 2000 | 85° | 58° | 71° | — | — |
| 1999 | 80° | 53° | 67° | — | — |
| 1998 | 79° | 52° | 65° | — | — |
| 1997 | 93° | 63° | 78° | — | — |
| 1996 | 85° | 52° | 68° | — | — |
| 1995 | 94° | 58° | 76° | — | — |
| 1994 | 81° | 57° | 69° | — | — |
| 1993 | 82° | 60° | 71° | — | — |
| 1992 | 93° | 60° | 77° | — | — |
| 1991 | 74° | 53° | 63° | — | — |
| 1990 | 76° | 57° | 66° | — | — |
| 1989 | 93° | 53° | 73° | — | — |
| 1988 | 85° | 49° | 67° | — | — |
| 1987 | 92° | 55° | 73° | — | — |
| 1986 | 86° | 55° | 71° | — | — |
| 1985 | 77° | 54° | 65° | — | — |
| 1984 | 89° | 58° | 73° | — | — |
| 1983 | 65° | 56° | 60° | — | — |
| 1982 | 74° | 45° | 59° | — | — |
| 1981 | 85° | 60° | 72° | — | — |
| 1980coldest | 63° | 52° | 57° | — | — |
| 1979 | 78° | 52° | 65° | — | — |
| 1978 | 88° | 51° | 69° | — | — |
| 1977 | 97° | 57° | 77° | — | — |
| 1976 | 85° | 51° | 68° | — | — |
| 1975 | 87° | 56° | 71° | — | — |
| 1974 | 78° | 55° | 67° | — | — |
| 1973 | 86° | 55° | 71° | — | — |
| 1972warmest | 95° | 67° | 81° | — | — |
| 1971 | 72° | 54° | 63° | — | — |
55 years of data from FONTANA KAISER