September weather in American Canyon, CA
The average temperature in American Canyon in September is 65.7°F (51.0°F–80.3°F). Average precipitation: 0.07 inches.
September is a fall month in American Canyon, and is warmer than the annual average of 57.7°F. Daily temperatures swing about 29.3°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
80.3°F
Avg Low
51.0°F
Precipitation
0.07 in
Daylight
12h 14m
September records in American Canyon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 106.0°F (2017) | 45.0°F (1999) | 0.01 in (2000) |
| September 2 | 107.1°F (2017) | 46.0°F (2004) | 0.01 in (2023) |
| September 3 | 96.1°F (2008) | 44.1°F (2000) | 0.03 in (2003) |
| September 4 | 100.0°F (2004) | 43.0°F (2000) | 0.00 in (1998) |
| September 5 | 111.0°F (2022) | 44.1°F (2000) | 0.00 in (1998) |
| September 6 | 115.0°F (2022) | 42.1°F (2015) | 0.00 in (1998) |
| September 7 | 106.0°F (2020) | 39.0°F (2002) | 0.00 in (1998) |
| September 8 | 102.9°F (2022) | 43.0°F (2002) | 0.01 in (1999) |
| September 9 | 99.0°F (2015) | 43.0°F (2002) | 0.01 in (1999) |
| September 10 | 96.1°F (2017) | 39.9°F (2005) | 0.00 in (1998) |
| September 11 | 98.1°F (2017) | 39.9°F (2005) | 0.02 in (2017) |
| September 12 | 99.0°F (2003) | 39.9°F (2005) | 0.01 in (2009) |
| September 13 | 100.0°F (2003) | 46.0°F (2002) | 0.10 in (2009) |
| September 14 | 89.1°F (2004) | 45.0°F (2018) | 0.00 in (1998) |
| September 15 | 91.0°F (2004) | 39.0°F (2006) | 0.00 in (1998) |
| September 16 | 87.1°F (2025) | 37.9°F (2006) | 0.06 in (2015) |
| September 17 | 93.9°F (2000) | 42.1°F (2005) | 0.00 in (1998) |
| September 18 | 98.1°F (2016) | 37.9°F (2008) | 0.59 in (2022) |
| September 19 | 97.0°F (2002) | 41.0°F (2005) | 0.01 in (2004) |
| September 20 | 97.0°F (2011) | 37.9°F (2004) | 0.02 in (2007) |
| September 21 | 102.0°F (2003) | 41.0°F (2012) | 0.82 in (2013) |
| September 22 | 99.0°F (2003) | 39.0°F (2017) | 0.09 in (2000) |
| September 23 | 96.1°F (2025) | 39.0°F (2005) | 0.00 in (1998) |
| September 24 | 96.1°F (2019) | 39.9°F (2005) | 0.30 in (2001) |
| September 25 | 99.0°F (2016) | 37.0°F (2005) | 0.23 in (2014) |
| September 26 | 99.0°F (2009) | 43.0°F (2013) | 0.04 in (2014) |
| September 27 | 100.9°F (2020) | 45.0°F (2004) | 0.03 in (1998) |
| September 28 | 102.9°F (2020) | 39.9°F (2001) | 0.03 in (1998) |
| September 29 | 96.1°F (1999) | 35.1°F (2019) | 0.03 in (2025) |
| September 30 | 98.1°F (2001) | 37.0°F (2009) | 0.07 in (2023) |