Weather on August 27
Rialto, CA
55 Years of Data
Avg High
96°F
Avg Low
65°F
Warmest
1981
91°F avg
Coldest
1973
70°F avg
About This Date
August 27th in Rialto, CA typically brings hot summer weather, with average highs around 96°F and lows near 65°F — a 31°F daily swing. Over 48 years of records, the warmest August 27th was in 1981 (91°F average), while the coldest was 1973 (70°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 27th dates historically.
Planning for August 27th 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 | 99° | 71° | 85° | — | — |
| 2017 | 102° | 72° | 87° | — | — |
| 2016 | 82° | 57° | 70° | — | — |
| 2015 | 99° | 74° | 86° | — | — |
| 2014 | 92° | 65° | 78° | — | — |
| 2013 | 95° | 74° | 84° | — | — |
| 2012 | 95° | 65° | 80° | — | — |
| 2011 | 104° | 79° | 91° | — | — |
| 2010 | 95° | 63° | 79° | — | — |
| 2009 | 102° | 73° | 88° | — | — |
| 2008 | 91° | 67° | 79° | — | — |
| 2007 | 92° | 67° | 79° | — | — |
| 2006 | 95° | 66° | 81° | — | — |
| 2005 | 101° | 71° | 86° | — | — |
| 2004 | 90° | 57° | 73° | — | — |
| 2003 | 97° | 71° | 84° | — | — |
| 2002 | 94° | 60° | 77° | — | — |
| 2001 | 100° | 68° | 84° | — | — |
| 2000 | 87° | 65° | 76° | — | — |
| 1999 | 103° | 71° | 87° | — | — |
| 1998 | 102° | 66° | 84° | — | — |
| 1997 | 98° | 65° | 81° | — | — |
| 1996 | 99° | 62° | 80° | — | — |
| 1995 | 98° | 66° | 82° | — | — |
| 1994 | 95° | 58° | 76° | — | — |
| 1993 | 92° | 69° | 80° | — | — |
| 1992 | 95° | 69° | 82° | — | — |
| 1991 | 83° | 57° | 70° | — | — |
| 1990 | 93° | 56° | 74° | — | — |
| 1989 | 87° | 54° | 70° | — | — |
| 1988 | 92° | 70° | 81° | — | — |
| 1987 | 99° | 59° | 79° | — | — |
| 1986 | 97° | 69° | 83° | — | — |
| 1985 | 101° | 68° | 84° | — | — |
| 1984 | 103° | 68° | 85° | — | — |
| 1983 | 104° | 67° | 85° | — | — |
| 1982 | 98° | 70° | 84° | — | — |
| 1981warmest | 111° | 72° | 91° | — | — |
| 1980 | 97° | 59° | 78° | — | — |
| 1979 | 100° | 63° | 81° | — | — |
| 1978 | 85° | 68° | 76° | — | — |
| 1977 | 88° | 65° | 76° | — | — |
| 1976 | 101° | 62° | 81° | — | — |
| 1975 | 94° | 53° | 73° | — | — |
| 1974 | 96° | 57° | 77° | — | — |
| 1973coldest | 82° | 58° | 70° | — | — |
| 1972 | 87° | 63° | 75° | 0.05" | — |
| 1971 | 105° | 62° | 84° | — | — |
48 years of data from FONTANA 5 N