Weather on September 3
Fontana, CA
55 Years of Data
Avg High
95°F
Avg Low
65°F
Warmest
2007
95°F avg
Coldest
1999
69°F avg
About This Date
September 3rd 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 3rd was in 2007 (95°F average), while the coldest was 1999 (69°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 3rd dates historically. The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
Planning for September 3rd in Fontana, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 72° | 85° | — | — |
| 2024 | 101° | 69° | 85° | — | — |
| 2023 | 81° | 64° | 72° | 0.03" | — |
| 2022 | 106° | 77° | 91° | — | — |
| 2021 | 94° | 63° | 78° | — | — |
| 2020 | 95° | 65° | 80° | — | — |
| 2019 | 98° | 75° | 87° | — | — |
| 2018 | 87° | 66° | 77° | — | — |
| 2017 | 100° | 73° | 87° | 0.05" | — |
| 2016 | 83° | 63° | 73° | — | — |
| 2015 | 85° | 62° | 73° | — | — |
| 2014 | 91° | 66° | 79° | — | — |
| 2013 | 101° | 75° | 88° | — | — |
| 2012 | 100° | 65° | 82° | — | — |
| 2011 | 93° | 60° | 77° | — | — |
| 2010 | 103° | 65° | 84° | — | — |
| 2009 | 101° | 73° | 87° | — | — |
| 2008 | 101° | 68° | 84° | — | — |
| 2007warmest | 110° | 80° | 95° | — | — |
| 2006 | 104° | 70° | 87° | — | — |
| 2005 | 94° | 60° | 77° | — | — |
| 2004 | 83° | 62° | 72° | — | — |
| 2003 | 94° | 66° | 80° | — | — |
| 2002 | 100° | 71° | 86° | — | — |
| 2001 | 88° | 65° | 76° | — | — |
| 2000 | 83° | 56° | 69° | — | — |
| 1999coldest | 79° | 59° | 69° | — | — |
| 1998 | 101° | 73° | 87° | — | — |
| 1997 | 100° | 73° | 87° | — | — |
| 1996 | 92° | 61° | 76° | — | — |
| 1995 | 104° | 71° | 88° | — | — |
| 1994 | 93° | 59° | 76° | — | — |
| 1993 | 101° | 67° | 84° | — | — |
| 1992 | 89° | 59° | 74° | — | — |
| 1991 | 98° | 66° | 82° | — | — |
| 1990 | 96° | 63° | 79° | — | — |
| 1989 | 98° | 54° | 76° | — | — |
| 1988 | 111° | 71° | 91° | — | — |
| 1987 | 101° | 65° | 83° | — | — |
| 1986 | 92° | 57° | 74° | — | — |
| 1985 | 81° | 62° | 71° | — | — |
| 1984 | 102° | 64° | 83° | — | — |
| 1983 | 99° | 63° | 81° | — | — |
| 1982 | 106° | 69° | 87° | — | — |
| 1981 | 89° | 56° | 72° | — | — |
| 1980 | 92° | 52° | 72° | — | — |
| 1979 | 97° | 56° | 76° | — | — |
| 1978 | 100° | 63° | 81° | — | — |
| 1977 | 88° | 62° | 75° | — | — |
| 1976 | 98° | 71° | 85° | — | — |
| 1975 | 98° | 65° | 81° | — | — |
| 1974 | 97° | 68° | 82° | — | — |
| 1973 | 84° | 56° | 70° | — | — |
| 1972 | 90° | 68° | 79° | — | — |
| 1971 | 91° | 63° | 77° | — | — |
55 years of data from FONTANA KAISER