Weather on August 25
Rialto, CA
55 Years of Data
Avg High
94°F
Avg Low
65°F
Warmest
2010
91°F avg
Coldest
1983
67°F avg
About This Date
August 25th in Rialto, CA typically brings hot summer weather, with average highs around 94°F and lows near 65°F — a 29°F daily swing. Over 47 years of records, the warmest August 25th was in 2010 (91°F average), while the coldest was 1983 (67°F) — a 24°F range across recorded history. This date has historically been dry, with little recorded precipitation.
Planning for August 25th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 100° | 73° | 87° | — | — |
| 2017 | 90° | 63° | 76° | — | — |
| 2016 | 89° | 63° | 76° | — | — |
| 2015 | 87° | 74° | 80° | — | — |
| 2014 | 81° | 63° | 72° | — | — |
| 2013 | 94° | 71° | 82° | — | — |
| 2012 | 84° | 61° | 72° | — | — |
| 2011 | 100° | 73° | 87° | — | — |
| 2010warmest | 104° | 77° | 91° | — | — |
| 2009 | 95° | 64° | 80° | — | — |
| 2008 | 101° | 73° | 87° | — | — |
| 2007 | 92° | 63° | 77° | — | — |
| 2006 | 89° | 63° | 76° | — | — |
| 2005 | 98° | 69° | 84° | — | — |
| 2004 | 88° | 59° | 73° | — | — |
| 2003 | 99° | 69° | 84° | — | — |
| 2002 | 95° | 65° | 80° | — | — |
| 2001 | 104° | 66° | 85° | — | — |
| 2000 | 94° | 70° | 82° | — | — |
| 1999 | 106° | 74° | 90° | — | — |
| 1998 | 95° | 67° | 81° | — | — |
| 1997 | 96° | 65° | 80° | — | — |
| 1996 | 103° | 72° | 87° | — | — |
| 1995 | 95° | 65° | 80° | — | — |
| 1994 | 99° | 59° | 79° | — | — |
| 1993 | 96° | 68° | 82° | — | — |
| 1992 | 88° | 58° | 73° | — | — |
| 1991 | 89° | 64° | 77° | — | — |
| 1990 | 82° | 62° | 72° | — | — |
| 1989 | 80° | 58° | 69° | — | — |
| 1988 | 97° | 72° | 84° | — | — |
| 1987 | 85° | 57° | 71° | — | — |
| 1985 | 110° | 70° | 90° | — | — |
| 1984 | 93° | 64° | 79° | — | — |
| 1983coldest | 74° | 61° | 67° | — | — |
| 1982 | 94° | 66° | 80° | — | — |
| 1981 | 109° | 70° | 89° | — | — |
| 1980 | 94° | 63° | 78° | — | — |
| 1979 | 98° | 64° | 81° | — | — |
| 1978 | 84° | 67° | 75° | — | — |
| 1977 | 90° | 61° | 75° | — | — |
| 1976 | 98° | 62° | 80° | — | — |
| 1975 | 99° | 56° | 77° | — | — |
| 1974 | 101° | 60° | 80° | — | — |
| 1973 | 82° | 57° | 70° | — | — |
| 1972 | 85° | 63° | 74° | — | — |
| 1971 | 100° | 60° | 80° | — | — |
47 years of data from FONTANA 5 N