Weather on September 8
Rialto, CA
55 Years of Data
Avg High
92°F
Avg Low
64°F
Warmest
1979
90°F avg
Coldest
2010
60°F avg
About This Date
September 8th in Rialto, CA typically brings hot fall weather, with average highs around 92°F and lows near 64°F — a 28°F daily swing. Over 48 years of records, the warmest September 8th was in 1979 (90°F average), while the coldest was 2010 (60°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 8th dates historically.
Planning for September 8th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 68° | 81° | — | — |
| 2017 | 90° | 67° | 78° | — | — |
| 2016 | 85° | 58° | 71° | — | — |
| 2015 | 101° | 75° | 88° | — | — |
| 2014 | 80° | 68° | 74° | — | — |
| 2013 | 92° | 71° | 81° | — | — |
| 2012 | 96° | 68° | 82° | — | — |
| 2011 | 96° | 72° | 84° | — | — |
| 2010coldest | 64° | 56° | 60° | — | — |
| 2009 | 87° | 61° | 74° | — | — |
| 2008 | 92° | 67° | 79° | — | — |
| 2007 | 87° | 60° | 74° | — | — |
| 2006 | 85° | 59° | 72° | — | — |
| 2005 | 88° | 57° | 72° | — | — |
| 2004 | 103° | 71° | 87° | — | — |
| 2003 | 88° | 58° | 73° | — | — |
| 2002 | 88° | 55° | 71° | — | — |
| 2001 | 82° | 56° | 69° | — | — |
| 2000 | 93° | 61° | 77° | — | — |
| 1999 | 96° | 64° | 80° | — | — |
| 1998 | 92° | 65° | 78° | — | — |
| 1997 | 100° | 71° | 86° | — | — |
| 1996 | 96° | 67° | 81° | — | — |
| 1995 | 89° | 68° | 79° | — | — |
| 1994 | 96° | 62° | 79° | — | — |
| 1993 | 103° | 71° | 87° | — | — |
| 1992 | 87° | 61° | 74° | — | — |
| 1991 | 86° | 55° | 71° | — | — |
| 1990 | 100° | 66° | 83° | — | — |
| 1989 | 87° | 52° | 69° | — | — |
| 1988 | 92° | 63° | 77° | — | — |
| 1987 | 97° | 59° | 78° | — | — |
| 1986 | 90° | 61° | 75° | — | — |
| 1985 | 78° | 60° | 69° | — | — |
| 1984 | 105° | 71° | 88° | — | — |
| 1983 | 98° | 66° | 82° | — | — |
| 1982 | 93° | 70° | 81° | 0.03" | — |
| 1981 | 100° | 67° | 83° | — | — |
| 1980 | 80° | 59° | 70° | — | — |
| 1979warmest | 111° | 69° | 90° | — | — |
| 1978 | 88° | 52° | 70° | — | — |
| 1977 | 105° | 68° | 87° | — | — |
| 1976 | 100° | 62° | 81° | — | — |
| 1975 | 84° | 65° | 74° | 0.25" | — |
| 1974 | 99° | 67° | 83° | — | — |
| 1973 | 84° | 60° | 72° | — | — |
| 1972 | 86° | 66° | 76° | — | — |
| 1971 | 108° | 67° | 87° | — | — |
48 years of data from DEVORE CALIFORNIA