Weather on August 28
Rialto, CA
55 Years of Data
Avg High
97°F
Avg Low
66°F
Warmest
2017
93°F avg
Coldest
2010
66°F avg
About This Date
August 28th in Rialto, CA typically brings hot summer weather, with average highs around 97°F and lows near 66°F — a 31°F daily swing. Over 48 years of records, the warmest August 28th was in 2017 (93°F average), while the coldest was 2010 (66°F) — a 27°F range across recorded history. This date has historically been dry, with little recorded precipitation.
Planning for August 28th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 73° | 82° | — | — |
| 2017warmest | 107° | 78° | 93° | — | — |
| 2016 | 93° | 62° | 78° | — | — |
| 2015 | 101° | 76° | 88° | — | — |
| 2014 | 96° | 71° | 84° | — | — |
| 2013 | 95° | 74° | 84° | — | — |
| 2012 | 101° | 73° | 87° | — | — |
| 2011 | 101° | 77° | 89° | — | — |
| 2010coldest | 77° | 56° | 66° | — | — |
| 2009 | 104° | 76° | 90° | — | — |
| 2008 | 93° | 67° | 80° | — | — |
| 2007 | 99° | 71° | 85° | — | — |
| 2006 | 101° | 71° | 86° | — | — |
| 2005 | 104° | 73° | 89° | — | — |
| 2004 | 99° | 61° | 80° | — | — |
| 2003 | 96° | 70° | 83° | — | — |
| 2002 | 90° | 54° | 72° | — | — |
| 2001 | 99° | 63° | 81° | — | — |
| 2000 | 86° | 62° | 74° | — | — |
| 1999 | 103° | 70° | 86° | — | — |
| 1998 | 107° | 74° | 90° | — | — |
| 1997 | 95° | 62° | 79° | — | — |
| 1996 | 105° | 66° | 86° | — | — |
| 1995 | 99° | 70° | 84° | — | — |
| 1994 | 96° | 60° | 78° | — | — |
| 1993 | 92° | 65° | 78° | — | — |
| 1992 | 92° | 66° | 79° | — | — |
| 1991 | 85° | 56° | 70° | — | — |
| 1990 | 98° | 62° | 80° | — | — |
| 1989 | 93° | 54° | 73° | — | — |
| 1988 | 96° | 67° | 81° | — | — |
| 1987 | 100° | 63° | 81° | — | — |
| 1986 | 99° | 64° | 81° | — | — |
| 1985 | 103° | 67° | 85° | — | — |
| 1984 | 102° | 71° | 87° | — | — |
| 1983 | 102° | 66° | 84° | — | — |
| 1982 | 96° | 68° | 82° | — | — |
| 1981 | 109° | 69° | 89° | — | — |
| 1980 | 96° | 58° | 77° | — | — |
| 1979 | 89° | 64° | 77° | — | — |
| 1978 | 93° | 70° | 81° | — | — |
| 1977 | 96° | 61° | 78° | — | — |
| 1976 | 107° | 64° | 86° | — | — |
| 1975 | 91° | 53° | 72° | — | — |
| 1974 | 96° | 56° | 76° | — | — |
| 1973 | 90° | 55° | 72° | — | — |
| 1972 | 98° | 62° | 80° | — | — |
| 1971 | 104° | 65° | 84° | — | — |
48 years of data from FONTANA 5 N