Weather on June 18
Rialto, CA
55 Years of Data
Avg High
89°F
Avg Low
58°F
Warmest
1981
86°F avg
Coldest
1975
58°F avg
About This Date
June 18th in Rialto, CA typically brings warm summer weather, with average highs around 89°F and lows near 58°F — a 31°F daily swing. Over 48 years of records, the warmest June 18th was in 1981 (86°F average), while the coldest was 1975 (58°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 4% of June 18th dates historically.
Planning for June 18th 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 |
|---|---|---|---|---|---|
| 2025 | 99° | 66° | 82° | — | — |
| 2017 | 96° | 66° | 81° | — | — |
| 2016 | 94° | 63° | 78° | — | — |
| 2015 | 94° | 64° | 79° | — | — |
| 2014 | 79° | 53° | 66° | — | — |
| 2013 | 85° | 60° | 72° | — | — |
| 2012 | 87° | 62° | 75° | — | — |
| 2011 | 78° | 55° | 67° | — | — |
| 2010 | 79° | 54° | 66° | — | — |
| 2009 | 85° | 56° | 70° | — | — |
| 2008 | 99° | 71° | 85° | — | — |
| 2007 | 88° | 58° | 73° | — | — |
| 2006 | 90° | 63° | 76° | — | — |
| 2005 | 78° | 53° | 66° | — | — |
| 2004 | 85° | 54° | 69° | — | — |
| 2003 | 84° | 54° | 69° | — | — |
| 2002 | 91° | 61° | 76° | — | — |
| 2001 | 95° | 64° | 80° | — | — |
| 2000 | 87° | 55° | 71° | — | — |
| 1999 | 94° | 60° | 77° | — | — |
| 1998 | 90° | 54° | 72° | — | — |
| 1997 | 97° | 61° | 79° | — | — |
| 1996 | 97° | 61° | 79° | — | — |
| 1995 | 83° | 52° | 67° | — | — |
| 1994 | 93° | 57° | 75° | — | — |
| 1993 | 95° | 57° | 76° | — | — |
| 1992 | 79° | 53° | 66° | — | — |
| 1991 | 81° | 56° | 68° | — | — |
| 1990 | 85° | 55° | 70° | — | — |
| 1989 | 101° | 63° | 82° | — | — |
| 1988 | 90° | 54° | 72° | — | — |
| 1987 | 86° | 55° | 71° | — | — |
| 1986 | 88° | 58° | 73° | — | — |
| 1985 | 95° | 60° | 78° | — | — |
| 1984 | 93° | 60° | 77° | — | — |
| 1983 | 87° | 56° | 71° | — | — |
| 1982 | 66° | 58° | 62° | 0.08" | — |
| 1981warmest | 107° | 64° | 86° | — | — |
| 1980 | 92° | 57° | 74° | — | — |
| 1979 | 78° | 56° | 67° | — | — |
| 1978 | 100° | 63° | 81° | — | — |
| 1977 | 91° | 55° | 73° | — | — |
| 1976 | 96° | 57° | 77° | — | — |
| 1975coldest | 63° | 53° | 58° | 0.23" | — |
| 1974 | 85° | 52° | 68° | — | — |
| 1973 | 100° | 54° | 77° | — | — |
| 1972 | 89° | 59° | 74° | — | — |
| 1971 | 96° | 56° | 76° | — | — |
48 years of data from DEVORE CALIFORNIA