Weather on May 31
Rialto, CA
55 Years of Data
Avg High
83°F
Avg Low
55°F
Warmest
2025
82°F avg
Coldest
1991
55°F avg
About This Date
May 31st in Rialto, CA typically brings warm spring weather, with average highs around 83°F and lows near 55°F — a 28°F daily swing. Over 48 years of records, the warmest May 31st was in 2025 (82°F average), while the coldest was 1991 (55°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 2% of May 31st dates historically.
Planning for May 31st in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 99° | 65° | 82° | — | — |
| 2017 | 72° | 56° | 64° | — | — |
| 2016 | 81° | 55° | 68° | — | — |
| 2015 | 83° | 58° | 70° | — | — |
| 2014 | 85° | 61° | 73° | — | — |
| 2013 | 87° | 56° | 71° | — | — |
| 2012 | 97° | 57° | 77° | — | — |
| 2011 | 77° | 50° | 64° | — | — |
| 2010 | 80° | 54° | 67° | — | — |
| 2009 | 76° | 56° | 66° | — | — |
| 2008 | 75° | 51° | 63° | — | — |
| 2007 | 78° | 48° | 63° | — | — |
| 2006 | 93° | 64° | 79° | — | — |
| 2005 | 85° | 53° | 69° | — | — |
| 2004 | 94° | 62° | 78° | — | — |
| 2003 | 88° | 54° | 71° | — | — |
| 2002 | 88° | 57° | 72° | — | — |
| 2001 | 102° | 59° | 81° | — | — |
| 2000 | 85° | 52° | 68° | — | — |
| 1999 | 81° | 51° | 66° | — | — |
| 1998 | 80° | 50° | 65° | — | — |
| 1997 | 92° | 62° | 77° | — | — |
| 1996 | 86° | 45° | 65° | — | — |
| 1995 | 91° | 58° | 74° | — | — |
| 1994 | 80° | 59° | 70° | — | — |
| 1993 | 75° | 55° | 65° | — | — |
| 1992 | 60° | 53° | 57° | — | — |
| 1991coldest | 63° | 47° | 55° | — | — |
| 1990 | 71° | 55° | 63° | — | — |
| 1989 | 87° | 51° | 69° | — | — |
| 1988 | 82° | 49° | 65° | — | — |
| 1987 | 90° | 51° | 70° | — | — |
| 1986 | 84° | 57° | 71° | — | — |
| 1985 | 75° | 64° | 70° | — | — |
| 1984 | 93° | 62° | 78° | — | — |
| 1983 | 83° | 59° | 71° | — | — |
| 1982 | 78° | 51° | 65° | — | — |
| 1981 | 90° | 61° | 75° | — | — |
| 1980 | 68° | 45° | 56° | 0.05" | — |
| 1979 | 83° | 58° | 70° | — | — |
| 1978 | 86° | 55° | 71° | — | — |
| 1977 | 97° | 57° | 77° | — | — |
| 1976 | 85° | 51° | 68° | — | — |
| 1975 | 90° | 55° | 72° | — | — |
| 1974 | 75° | 57° | 66° | — | — |
| 1973 | 78° | 58° | 68° | — | — |
| 1972 | 96° | 59° | 78° | — | — |
| 1971 | 70° | 53° | 61° | — | — |
48 years of data from DEVORE CALIFORNIA