Weather on September 4
Vacaville, CA
55 Years of Data
Avg High
93°F
Avg Low
57°F
Warmest
1988
86°F avg
Coldest
2000
62°F avg
About This Date
September 4th 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 4th was in 1988 (86°F average), while the coldest was 2000 (62°F) — a 24°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for September 4th in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 60° | 74° | — | — |
| 2024 | 103° | 58° | 80° | — | — |
| 2023 | 88° | 54° | 71° | — | — |
| 2022 | 107° | 59° | 83° | — | — |
| 2021 | 95° | 51° | 73° | — | — |
| 2020 | 102° | 58° | 80° | — | — |
| 2019 | 98° | 59° | 79° | — | — |
| 2018 | 94° | 57° | 75° | — | — |
| 2017 | 96° | 72° | 84° | — | — |
| 2016 | 85° | 54° | 69° | — | — |
| 2015 | 84° | 56° | 70° | — | — |
| 2014 | 91° | 55° | 73° | — | — |
| 2013 | 88° | 56° | 72° | — | — |
| 2012 | 94° | 52° | 73° | — | — |
| 2011 | 93° | 56° | 74° | — | — |
| 2010 | 97° | 55° | 76° | — | — |
| 2009 | 90° | 63° | 76° | — | — |
| 2008 | 100° | 60° | 80° | — | — |
| 2007 | 86° | 64° | 75° | — | — |
| 2006 | 91° | 52° | 71° | — | — |
| 2005 | 85° | 56° | 70° | — | — |
| 2004 | 97° | 68° | 82° | — | — |
| 2003 | 92° | 64° | 78° | — | — |
| 2002 | 88° | 62° | 75° | — | — |
| 2001 | 99° | 57° | 78° | — | — |
| 2000coldest | 79° | 45° | 62° | — | — |
| 1999 | 90° | 52° | 71° | — | — |
| 1998 | 96° | 69° | 83° | — | — |
| 1997 | 100° | 64° | 82° | — | — |
| 1996 | 85° | 56° | 70° | — | — |
| 1995 | 90° | 51° | 70° | — | — |
| 1994 | 94° | 55° | 74° | — | — |
| 1993 | 101° | 61° | 81° | — | — |
| 1992 | 89° | 51° | 70° | — | — |
| 1991 | 107° | 63° | 85° | — | — |
| 1990 | 91° | 52° | 71° | — | — |
| 1989 | 95° | 55° | 75° | — | — |
| 1988warmest | 107° | 64° | 86° | — | — |
| 1987 | 92° | 53° | 72° | — | — |
| 1986 | 92° | 54° | 73° | — | — |
| 1985 | 85° | 52° | 68° | — | — |
| 1984 | 101° | 54° | 77° | — | — |
| 1983 | 100° | 58° | 79° | — | — |
| 1982 | 93° | 53° | 73° | — | — |
| 1981 | 90° | 52° | 71° | — | — |
| 1980 | 88° | 50° | 69° | — | — |
| 1979 | 88° | 53° | 70° | — | — |
| 1978 | 85° | 63° | 74° | — | — |
| 1977 | 98° | 55° | 77° | — | — |
| 1976 | 97° | — | — | — | — |
| 1975 | 102° | 50° | 76° | — | — |
| 1974 | 94° | 51° | 72° | — | — |
| 1973 | 91° | 51° | 71° | — | — |
| 1972 | 89° | 57° | 73° | — | — |
| 1971 | 96° | 51° | 74° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS