September weather in Vacaville, CA
The average temperature in Vacaville in September is 73.1°F (55.6°F–90.6°F). Average precipitation: 0.06 inches.
September is a fall month in Vacaville, and is warmer than the annual average of 62.1°F. Daily temperatures swing about 35°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 14m. For travel, September is hot.
Avg High
90.6°F
Avg Low
55.6°F
Precipitation
0.06 in
Daylight
12h 14m
September records in Vacaville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 111.9°F (2017) | 51.1°F (2012) | 0.03 in (2000) |
| September 2 | 109.9°F (2017) | 48.9°F (2012) | 0.00 in (1998) |
| September 3 | 107.1°F (2017) | 52.0°F (2024) | 0.00 in (1998) |
| September 4 | 107.1°F (2022) | 45.0°F (2000) | 0.00 in (1998) |
| September 5 | 115.0°F (2022) | 50.0°F (2015) | 0.00 in (1998) |
| September 6 | 115.0°F (2022) | 50.0°F (2015) | 0.00 in (1998) |
| September 7 | 111.9°F (2020) | 46.0°F (2002) | 0.00 in (1998) |
| September 8 | 111.0°F (2022) | 46.9°F (2002) | 0.00 in (1998) |
| September 9 | 107.1°F (2022) | 50.0°F (2014) | 0.00 in (1998) |
| September 10 | 109.9°F (2015) | 48.0°F (2019) | 0.05 in (2021) |
| September 11 | 105.1°F (2015) | 51.1°F (2019) | 0.00 in (1998) |
| September 12 | 102.9°F (2014) | 50.0°F (2005) | 0.00 in (1998) |
| September 13 | 102.9°F (2014) | 48.0°F (2005) | 0.06 in (1999) |
| September 14 | 100.0°F (2019) | 46.9°F (2010) | 0.00 in (1998) |
| September 15 | 98.1°F (1998) | 48.9°F (2006) | 0.00 in (1998) |
| September 16 | 97.0°F (2025) | 44.1°F (2018) | 0.03 in (2019) |
| September 17 | 99.0°F (2000) | 45.0°F (2018) | 0.00 in (1998) |
| September 18 | 104.0°F (2000) | 46.9°F (2008) | 0.43 in (2022) |
| September 19 | 104.0°F (2000) | 46.9°F (2019) | 0.33 in (2022) |
| September 20 | 102.9°F (2003) | 46.0°F (2004) | 0.04 in (2007) |
| September 21 | 102.9°F (2015) | 48.9°F (2018) | 0.23 in (2013) |
| September 22 | 105.1°F (2009) | 46.0°F (2016) | 0.02 in (1999) |
| September 23 | 102.9°F (2009) | 48.0°F (2015) | 0.00 in (1998) |
| September 24 | 100.9°F (2019) | 45.0°F (2023) | 0.19 in (2001) |
| September 25 | 100.9°F (2009) | 46.9°F (2005) | 0.31 in (2014) |
| September 26 | 102.9°F (2009) | 48.9°F (2018) | 0.12 in (1998) |
| September 27 | 100.9°F (2009) | 48.9°F (2023) | 0.16 in (1998) |
| September 28 | 104.0°F (2010) | 45.0°F (2013) | 0.06 in (1998) |
| September 29 | 104.0°F (2010) | 41.0°F (2019) | 0.00 in (1998) |
| September 30 | 105.1°F (2020) | 42.1°F (2007) | 0.13 in (2023) |