Weather on September 1
Fairfield, CA
55 Years of Data
Avg High
90°F
Avg Low
57°F
Warmest
2017
89°F avg
Coldest
1973
63°F avg
About This Date
September 1st in Fairfield, CA typically brings hot fall weather, with average highs around 90°F and lows near 57°F — a 33°F daily swing. Over 55 years of records, the warmest September 1st was in 2017 (89°F average), while the coldest was 1973 (63°F) — a 26°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Fairfield, 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 | 102° | 65° | 83° | — | — |
| 2024 | 87° | 59° | 73° | — | — |
| 2023 | 76° | 59° | 67° | — | — |
| 2022 | 103° | 60° | 81° | — | — |
| 2021 | 87° | 55° | 71° | — | — |
| 2020 | 82° | 59° | 71° | — | — |
| 2019 | 96° | 61° | 78° | — | — |
| 2018 | 86° | 56° | 71° | — | — |
| 2017warmest | 110° | 68° | 89° | — | — |
| 2016 | 81° | 58° | 69° | — | — |
| 2015 | 84° | 59° | 72° | — | — |
| 2014 | 98° | 60° | 79° | — | — |
| 2013 | 92° | 63° | 77° | — | — |
| 2012 | 78° | 55° | 67° | — | — |
| 2011 | 91° | 43° | 67° | — | — |
| 2010 | 88° | 59° | 73° | — | — |
| 2009 | 83° | 54° | 68° | — | — |
| 2008 | 84° | 55° | 70° | — | — |
| 2007 | 99° | 62° | 80° | — | — |
| 2006 | 98° | 56° | 77° | — | — |
| 2005 | 100° | 56° | 78° | — | — |
| 2004 | 92° | 57° | 74° | — | — |
| 2003 | 98° | 54° | 76° | — | — |
| 2002 | 97° | 53° | 75° | — | — |
| 2001 | 91° | 56° | 73° | — | — |
| 2000 | 77° | 57° | 67° | — | — |
| 1999 | 83° | 52° | 67° | — | — |
| 1998 | 103° | 56° | 79° | — | — |
| 1997 | 87° | 58° | 72° | — | — |
| 1996 | 94° | 55° | 74° | — | — |
| 1995 | 86° | 55° | 71° | — | — |
| 1994 | 82° | 57° | 70° | — | — |
| 1993 | 97° | 59° | 78° | — | — |
| 1992 | 82° | 57° | 70° | — | — |
| 1991 | 92° | 60° | 76° | — | — |
| 1990 | 84° | 59° | 72° | — | — |
| 1989 | 89° | 56° | 72° | — | — |
| 1988 | 94° | 56° | 75° | — | — |
| 1987 | 93° | 62° | 78° | — | — |
| 1986 | 96° | 52° | 74° | — | — |
| 1985 | 99° | 57° | 78° | — | — |
| 1984 | 93° | 57° | 75° | — | — |
| 1983 | 86° | 54° | 70° | — | — |
| 1982 | 94° | 52° | 73° | — | — |
| 1981 | 99° | 58° | 78° | — | — |
| 1980 | 90° | 53° | 71° | — | — |
| 1979 | 90° | 58° | 74° | — | — |
| 1978 | 83° | 54° | 68° | — | — |
| 1977 | 78° | 54° | 66° | — | — |
| 1976 | 102° | 62° | 82° | — | — |
| 1975 | 82° | 52° | 67° | — | — |
| 1974 | 81° | 55° | 68° | — | — |
| 1973coldest | 76° | 51° | 63° | — | — |
| 1972 | 85° | 54° | 69° | — | — |
| 1971 | 85° | 56° | 70° | — | — |
55 years of data from FAIRFIELD