Weather on September 1
Vacaville, CA
55 Years of Data
Avg High
93°F
Avg Low
57°F
Warmest
2017
87°F avg
Coldest
2000
63°F avg
About This Date
September 1st in Vacaville, CA typically brings hot fall weather, with average highs around 93°F and lows near 57°F — a 36°F daily swing. Over 55 years of records, the warmest September 1st was in 2017 (87°F average), while the coldest was 2000 (63°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 1st dates historically. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 1st in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 102° | 59° | 81° | — | — |
| 2024 | 93° | 61° | 77° | — | — |
| 2023 | 76° | 61° | 68° | — | — |
| 2022 | 105° | 57° | 81° | — | — |
| 2021 | 79° | 54° | 66° | — | — |
| 2020 | 92° | 61° | 76° | — | — |
| 2019 | 99° | 56° | 77° | — | — |
| 2018 | 93° | 59° | 76° | — | — |
| 2017warmest | 112° | 63° | 87° | — | — |
| 2016 | 87° | 58° | 72° | — | — |
| 2015 | 90° | 57° | 73° | — | — |
| 2014 | 98° | 59° | 79° | — | — |
| 2013 | 92° | 63° | 77° | — | — |
| 2012 | 80° | 51° | 66° | — | — |
| 2011 | 95° | 64° | 80° | — | — |
| 2010 | 99° | 60° | 79° | — | — |
| 2009 | — | 61° | — | — | — |
| 2008 | 90° | 66° | 78° | — | — |
| 2007 | — | 66° | — | — | — |
| 2006 | 96° | 57° | 77° | — | — |
| 2005 | 95° | 57° | 76° | — | — |
| 2004 | 93° | 63° | 78° | — | — |
| 2003 | 99° | 61° | 80° | — | — |
| 2002 | 102° | 59° | 81° | — | — |
| 2001 | 92° | 58° | 75° | — | — |
| 2000coldest | 69° | 58° | 63° | 0.08" | — |
| 1999 | 82° | 53° | 68° | — | — |
| 1998 | 106° | 65° | 85° | — | — |
| 1997 | 94° | 56° | 75° | — | — |
| 1996 | 96° | 55° | 76° | — | — |
| 1995 | 94° | 51° | 72° | — | — |
| 1994 | 86° | 52° | 69° | — | — |
| 1993 | 99° | 61° | 80° | — | — |
| 1992 | 89° | 54° | 71° | — | — |
| 1991 | 96° | 56° | 76° | — | — |
| 1990 | 91° | 57° | 74° | — | — |
| 1989 | 95° | 57° | 76° | — | — |
| 1988 | 102° | 60° | 81° | — | — |
| 1987 | 98° | 64° | 81° | — | — |
| 1986 | 98° | 55° | 77° | — | — |
| 1985 | 93° | 62° | 78° | — | — |
| 1984 | 95° | 49° | 72° | — | — |
| 1983 | 85° | 54° | 69° | — | — |
| 1982 | 96° | 53° | 75° | — | — |
| 1981 | 92° | 49° | 70° | — | — |
| 1980 | 90° | 53° | 71° | — | — |
| 1979 | 84° | 60° | 72° | — | — |
| 1978 | 95° | 54° | 74° | — | — |
| 1977 | 84° | 53° | 69° | — | — |
| 1976 | 103° | 58° | 80° | — | — |
| 1975 | 83° | 49° | 66° | — | — |
| 1974 | 91° | 53° | 72° | — | — |
| 1973 | 96° | 48° | 72° | — | — |
| 1972 | 98° | 53° | 76° | — | — |
| 1971 | 89° | 53° | 71° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS