Weather on May 20
Rialto, CA
55 Years of Data
Avg High
80°F
Avg Low
54°F
Warmest
2000
83°F avg
Coldest
2002
53°F avg
About This Date
May 20th in Rialto, CA typically brings warm spring weather, with average highs around 80°F and lows near 54°F — a 26°F daily swing. Over 48 years of records, the warmest May 20th was in 2000 (83°F average), while the coldest was 2002 (53°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 20th dates historically.
Planning for May 20th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 58° | 75° | — | — |
| 2017 | 90° | 59° | 74° | — | — |
| 2016 | 67° | 52° | 59° | — | — |
| 2015 | 71° | 51° | 61° | — | — |
| 2014 | 64° | 50° | 57° | — | — |
| 2013 | 91° | 57° | 74° | — | — |
| 2012 | 95° | 58° | 76° | — | — |
| 2011 | 70° | 46° | 58° | — | — |
| 2010 | 80° | 54° | 67° | — | — |
| 2009 | 85° | 61° | 73° | — | — |
| 2008 | 83° | 58° | 70° | — | — |
| 2007 | 76° | 51° | 63° | — | — |
| 2006 | 81° | 55° | 68° | — | — |
| 2005 | 90° | 64° | 77° | — | — |
| 2004 | 68° | 50° | 59° | — | — |
| 2003 | 94° | 68° | 81° | — | — |
| 2002coldest | 58° | 48° | 53° | — | — |
| 2001 | 81° | 52° | 66° | — | — |
| 2000warmest | 101° | 65° | 83° | — | — |
| 1999 | 74° | 53° | 63° | — | — |
| 1998 | 71° | 45° | 58° | — | — |
| 1997 | 81° | 58° | 69° | — | — |
| 1996 | 79° | 50° | 64° | — | — |
| 1995 | 75° | 49° | 62° | — | — |
| 1994 | 78° | 47° | 62° | — | — |
| 1993 | 69° | 58° | 63° | — | — |
| 1992 | 71° | 54° | 62° | — | — |
| 1991 | 69° | 44° | 57° | — | — |
| 1990 | 73° | 52° | 62° | — | — |
| 1989 | 86° | 54° | 70° | — | — |
| 1988 | 96° | 55° | 76° | — | — |
| 1987 | 64° | 54° | 59° | — | — |
| 1986 | 88° | 54° | 71° | — | — |
| 1985 | 80° | 55° | 68° | — | — |
| 1984 | 92° | 58° | 75° | — | — |
| 1983 | 94° | 54° | 74° | — | — |
| 1982 | 84° | 53° | 69° | — | — |
| 1981 | 69° | 52° | 60° | — | — |
| 1980 | 85° | 58° | 71° | — | — |
| 1979 | 78° | 56° | 67° | — | — |
| 1978 | 87° | 57° | 72° | — | — |
| 1977 | 88° | 48° | 68° | — | — |
| 1976 | 82° | 55° | 69° | — | — |
| 1975 | 63° | 50° | 56° | 0.48" | — |
| 1974 | 80° | 41° | 61° | — | — |
| 1973 | 76° | 57° | 66° | — | — |
| 1972 | 67° | 45° | 56° | 0.05" | — |
| 1971 | 86° | 47° | 66° | — | — |
48 years of data from DEVORE CALIFORNIA