September weather in Windsor, CA
The average temperature in Windsor in September is 66.5°F (49.6°F–83.4°F). Average precipitation: 0.13 inches.
September is a fall month in Windsor, and is warmer than the annual average of 58.1°F. Daily temperatures swing about 33.8°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
83.4°F
Avg Low
49.6°F
Precipitation
0.13 in
Daylight
12h 14m
September records in Windsor
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 109.9°F (2017) | 46.0°F (1999) | 0.02 in (2000) |
| September 2 | 109.9°F (2017) | 43.0°F (2012) | 0.41 in (2000) |
| September 3 | 100.0°F (2017) | 43.0°F (2000) | 0.10 in (2003) |
| September 4 | 102.9°F (2022) | 42.1°F (2016) | 0.00 in (1998) |
| September 5 | 111.9°F (2022) | 43.0°F (2010) | 0.00 in (1998) |
| September 6 | 114.1°F (2022) | 43.0°F (2002) | 0.00 in (1998) |
| September 7 | 111.0°F (2020) | 45.0°F (2012) | 0.02 in (2017) |
| September 8 | 108.0°F (2022) | 43.0°F (2002) | 0.02 in (2025) |
| September 9 | 102.0°F (2015) | 39.0°F (2012) | 0.10 in (2025) |
| September 10 | 102.0°F (2015) | 43.0°F (2012) | 0.04 in (2021) |
| September 11 | 99.0°F (2003) | 43.0°F (2005) | 0.00 in (1998) |
| September 12 | 102.0°F (2003) | 45.0°F (2000) | 0.06 in (2009) |
| September 13 | 100.0°F (2003) | 45.0°F (2021) | 0.11 in (2009) |
| September 14 | 93.0°F (2019) | 43.0°F (2018) | 0.01 in (2015) |
| September 15 | 97.0°F (2004) | 44.1°F (2006) | 0.00 in (1998) |
| September 16 | 91.9°F (2025) | 41.0°F (2006) | 0.41 in (2015) |
| September 17 | 98.1°F (2000) | 44.1°F (2006) | 0.03 in (2022) |
| September 18 | 100.9°F (2000) | 41.0°F (2008) | 0.88 in (2022) |
| September 19 | 104.0°F (2000) | 41.0°F (2008) | 0.12 in (2010) |
| September 20 | 100.0°F (2003) | 39.9°F (2004) | 0.16 in (2013) |
| September 21 | 102.9°F (2003) | 39.9°F (2012) | 0.24 in (2013) |
| September 22 | 102.9°F (2003) | 41.0°F (2012) | 0.07 in (1999) |
| September 23 | 100.0°F (2024) | 42.1°F (2008) | 0.00 in (1998) |
| September 24 | 102.9°F (2019) | 39.9°F (2008) | 0.07 in (2001) |
| September 25 | 105.1°F (2019) | 39.0°F (2005) | 0.12 in (2014) |
| September 26 | 100.9°F (2009) | 43.0°F (2004) | 0.55 in (2014) |
| September 27 | 102.0°F (2010) | 43.0°F (2008) | 0.08 in (1998) |
| September 28 | 104.0°F (2010) | 42.1°F (2001) | 0.02 in (1998) |
| September 29 | 98.1°F (2010) | 39.9°F (2007) | 0.19 in (2025) |
| September 30 | 99.0°F (2001) | 37.0°F (2019) | 0.07 in (2013) |