Weather on September 4
Fontana, CA
55 Years of Data
Avg High
95°F
Avg Low
65°F
Warmest
2022
94°F avg
Coldest
1985
66°F avg
About This Date
September 4th in Fontana, CA typically brings hot fall weather, with average highs around 95°F and lows near 65°F — a 30°F daily swing. Over 55 years of records, the warmest September 4th was in 2022 (94°F average), while the coldest was 1985 (66°F) — a 28°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
Planning for September 4th in Fontana, 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 | 97° | 71° | 84° | — | — |
| 2024 | 106° | 72° | 89° | — | — |
| 2023 | 81° | 63° | 72° | — | — |
| 2022warmest | 109° | 79° | 94° | — | — |
| 2021 | 102° | 65° | 83° | — | — |
| 2020 | 103° | 69° | 86° | — | — |
| 2019 | 102° | 75° | 89° | — | — |
| 2018 | 88° | 65° | 76° | — | — |
| 2017 | 90° | 71° | 80° | — | — |
| 2016 | 80° | 61° | 70° | — | — |
| 2015 | 83° | 62° | 72° | — | — |
| 2014 | 88° | 66° | 77° | — | — |
| 2013 | 104° | 74° | 89° | — | — |
| 2012 | 99° | 69° | 84° | — | — |
| 2011 | 92° | 61° | 76° | — | — |
| 2010 | 107° | 65° | 86° | — | — |
| 2009 | 101° | 74° | 87° | — | — |
| 2008 | 99° | 69° | 84° | — | — |
| 2007 | 101° | 71° | 86° | — | — |
| 2006 | 103° | 70° | 86° | — | — |
| 2005 | 93° | 59° | 76° | — | — |
| 2004 | 96° | 59° | 78° | — | — |
| 2003 | 102° | 68° | 85° | — | — |
| 2002 | 98° | 66° | 82° | — | — |
| 2001 | 92° | 63° | 77° | — | — |
| 2000 | 87° | 57° | 72° | — | — |
| 1999 | 84° | 57° | 71° | — | — |
| 1998 | 82° | 71° | 77° | — | — |
| 1997 | 106° | 73° | 89° | — | — |
| 1996 | 92° | 62° | 77° | — | — |
| 1995 | 101° | 67° | 84° | — | — |
| 1994 | 95° | 62° | 79° | — | — |
| 1993 | 101° | 62° | 81° | — | — |
| 1992 | 85° | 56° | 70° | — | — |
| 1991 | 93° | 65° | 79° | — | — |
| 1990 | 101° | 63° | 82° | — | — |
| 1989 | 100° | 58° | 79° | — | — |
| 1988 | 87° | 72° | 79° | — | — |
| 1987 | 94° | 62° | 78° | — | — |
| 1986 | 97° | 57° | 77° | — | — |
| 1985coldest | 74° | 59° | 66° | — | — |
| 1984 | 109° | 67° | 88° | — | — |
| 1983 | 95° | 56° | 75° | — | — |
| 1982 | 104° | 66° | 85° | — | — |
| 1981 | 89° | 58° | 73° | — | — |
| 1980 | 92° | 56° | 74° | — | — |
| 1979 | 95° | 52° | 73° | — | — |
| 1978 | 96° | 69° | 83° | — | — |
| 1977 | 92° | 59° | 75° | — | — |
| 1976 | 98° | 67° | 82° | — | — |
| 1975 | 101° | 69° | 85° | — | — |
| 1974 | 99° | 70° | 84° | — | — |
| 1973 | 79° | 57° | 68° | — | — |
| 1972 | 99° | 71° | 85° | — | — |
| 1971 | 100° | 64° | 82° | — | — |
55 years of data from FONTANA KAISER