Weather on June 20
Rialto, CA
55 Years of Data
Avg High
89°F
Avg Low
59°F
Warmest
2016
93°F avg
Coldest
2003
57°F avg
About This Date
June 20th in Rialto, CA typically brings warm summer weather, with average highs around 89°F and lows near 59°F — a 30°F daily swing. Over 48 years of records, the warmest June 20th was in 2016 (93°F average), while the coldest was 2003 (57°F) — a 36°F range across recorded history. This date has historically been dry, with little recorded precipitation.
Planning for June 20th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 60° | 74° | — | — |
| 2017 | 101° | 72° | 86° | — | — |
| 2016warmest | 108° | 79° | 93° | — | — |
| 2015 | 96° | 66° | 81° | — | — |
| 2014 | 93° | 63° | 78° | — | — |
| 2013 | 84° | 59° | 72° | — | — |
| 2012 | 87° | 55° | 71° | — | — |
| 2011 | 91° | 55° | 73° | — | — |
| 2010 | 80° | 53° | 67° | — | — |
| 2009 | 72° | 58° | 65° | — | — |
| 2008 | 103° | 78° | 90° | — | — |
| 2007 | 92° | 60° | 76° | — | — |
| 2006 | 90° | 60° | 75° | — | — |
| 2005 | 93° | 55° | 74° | — | — |
| 2004 | 85° | 54° | 69° | — | — |
| 2003coldest | 60° | 54° | 57° | — | — |
| 2002 | 85° | 55° | 70° | — | — |
| 2001 | 96° | 61° | 78° | — | — |
| 2000 | 94° | 54° | 74° | — | — |
| 1999 | 91° | 58° | 74° | — | — |
| 1998 | 81° | 54° | 67° | — | — |
| 1997 | 90° | 57° | 73° | — | — |
| 1996 | 89° | 55° | 72° | — | — |
| 1995 | 81° | 54° | 67° | — | — |
| 1994 | 94° | 59° | 76° | — | — |
| 1993 | 85° | 62° | 73° | — | — |
| 1992 | 81° | 62° | 71° | — | — |
| 1991 | 76° | 50° | 63° | — | — |
| 1990 | 95° | 59° | 77° | — | — |
| 1989 | 101° | 67° | 84° | — | — |
| 1988 | 78° | 58° | 68° | — | — |
| 1987 | 78° | 57° | 68° | — | — |
| 1986 | 89° | 59° | 74° | — | — |
| 1985 | 90° | 59° | 74° | — | — |
| 1984 | 90° | 58° | 74° | — | — |
| 1983 | 82° | 57° | 70° | — | — |
| 1982 | 83° | 59° | 71° | — | — |
| 1981 | 100° | 63° | 81° | — | — |
| 1980 | 94° | 56° | 75° | — | — |
| 1979 | 91° | 54° | 72° | — | — |
| 1978 | 99° | 60° | 79° | — | — |
| 1977 | 84° | 57° | 71° | — | — |
| 1976 | 94° | 59° | 76° | — | — |
| 1975 | 77° | 52° | 64° | — | — |
| 1974 | 95° | 55° | 75° | — | — |
| 1973 | 105° | 61° | 83° | — | — |
| 1972 | 94° | 60° | 77° | — | — |
| 1971 | 105° | 59° | 82° | — | — |
48 years of data from DEVORE CALIFORNIA