Weather on September 4
Rialto, CA
55 Years of Data
Avg High
95°F
Avg Low
65°F
Warmest
1984
89°F avg
Coldest
1985
63°F avg
About This Date
September 4th in Rialto, CA typically brings hot fall weather, with average highs around 95°F and lows near 65°F — a 30°F daily swing. Over 48 years of records, the warmest September 4th was in 1984 (89°F average), while the coldest was 1985 (63°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 4th dates historically.
Planning for September 4th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 72° | 85° | — | — |
| 2017 | 89° | 68° | 79° | — | — |
| 2016 | 75° | 58° | 66° | — | — |
| 2015 | 79° | 60° | 69° | — | — |
| 2014 | 85° | 59° | 72° | — | — |
| 2013 | 99° | 74° | 86° | — | — |
| 2012 | 95° | 70° | 82° | — | — |
| 2011 | 92° | 70° | 81° | — | — |
| 2010 | 102° | 75° | 89° | — | — |
| 2009 | 95° | 74° | 84° | — | — |
| 2008 | 99° | 72° | 85° | — | — |
| 2007 | 97° | 70° | 83° | — | — |
| 2006 | 99° | 76° | 87° | — | — |
| 2005 | 94° | 60° | 77° | — | — |
| 2004 | 94° | 55° | 74° | — | — |
| 2003 | 103° | 69° | 86° | — | — |
| 2002 | 101° | 71° | 86° | — | — |
| 2001 | 95° | 62° | 79° | — | — |
| 2000 | 86° | 54° | 70° | — | — |
| 1999 | 87° | 51° | 69° | — | — |
| 1998 | 85° | 67° | 76° | — | — |
| 1997 | 102° | 76° | 89° | — | — |
| 1996 | 94° | 60° | 77° | — | — |
| 1995 | 98° | 72° | 85° | — | — |
| 1994 | 95° | 58° | 76° | — | — |
| 1993 | 97° | 69° | 83° | — | — |
| 1992 | 83° | 55° | 69° | — | — |
| 1991 | 94° | 66° | 80° | — | — |
| 1990 | 98° | 65° | 81° | — | — |
| 1989 | 97° | 59° | 78° | — | — |
| 1988 | 105° | 73° | 89° | — | — |
| 1987 | 93° | 67° | 80° | — | — |
| 1986 | 97° | 60° | 78° | — | — |
| 1985coldest | 69° | 57° | 63° | — | — |
| 1984warmest | 108° | 71° | 89° | — | — |
| 1983 | 100° | 62° | 81° | — | — |
| 1982 | 108° | 69° | 88° | — | — |
| 1981 | 93° | 61° | 77° | — | — |
| 1980 | 99° | 60° | 79° | — | — |
| 1979 | 99° | 58° | 78° | — | — |
| 1978 | 97° | 70° | 83° | — | — |
| 1977 | 104° | 63° | 83° | — | — |
| 1976 | 98° | 67° | 82° | 0.38" | — |
| 1975 | 103° | 64° | 83° | — | — |
| 1974 | 104° | 68° | 86° | — | — |
| 1973 | 79° | 57° | 68° | — | — |
| 1972 | 99° | 67° | 83° | 0.08" | — |
| 1971 | 101° | 57° | 79° | — | — |
48 years of data from DEVORE CALIFORNIA