September weather in Bristol, WI
The average temperature in Bristol in September is 62.4°F (51.2°F–73.7°F). Average precipitation: 3.62 inches.
September is a fall month in Bristol, and is warmer than the annual average of 47.4°F. Daily temperatures swing about 22.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
73.7°F
Avg Low
51.2°F
Precipitation
3.62 in
Daylight
12h 16m
September records in Bristol
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2012) | 42.1°F (2009) | 0.12 in (2010) |
| September 2 | 93.0°F (2011) | 43.0°F (2009) | 0.55 in (2012) |
| September 3 | 91.9°F (2008) | 43.0°F (2017) | 0.93 in (2018) |
| September 4 | 91.9°F (2023) | 39.9°F (2025) | 1.10 in (2018) |
| September 5 | 90.0°F (2012) | 44.1°F (2009) | 1.74 in (2008) |
| September 6 | 90.0°F (2015) | 43.0°F (2011) | 0.70 in (2017) |
| September 7 | 91.0°F (2016) | 39.0°F (2025) | 0.51 in (2007) |
| September 8 | 90.0°F (2005) | 36.0°F (2025) | 1.38 in (2016) |
| September 9 | 82.9°F (2006) | 44.1°F (2010) | 1.02 in (2015) |
| September 10 | 90.0°F (2013) | 41.0°F (2008) | 0.30 in (2014) |
| September 11 | 93.0°F (2013) | 41.0°F (2008) | 3.22 in (2022) |
| September 12 | 90.0°F (2005) | 42.1°F (2007) | 0.63 in (2006) |
| September 13 | 90.0°F (2005) | 39.0°F (2014) | 1.65 in (2025) |
| September 14 | 91.9°F (2005) | 39.9°F (2023) | 0.75 in (2008) |
| September 15 | 84.0°F (2009) | 35.1°F (2007) | 0.67 in (2008) |
| September 16 | 88.0°F (2024) | 35.1°F (2007) | 0.66 in (2005) |
| September 17 | 90.0°F (2021) | 41.0°F (2013) | 0.60 in (2023) |
| September 18 | 90.0°F (2018) | 41.0°F (2013) | 4.15 in (2015) |
| September 19 | 89.1°F (2024) | 34.0°F (2012) | 0.56 in (2015) |
| September 20 | 87.1°F (2016) | 35.1°F (2012) | 1.55 in (2025) |
| September 21 | 90.0°F (2017) | 37.0°F (2006) | 0.65 in (2009) |
| September 22 | 91.9°F (2017) | 37.0°F (2006) | 0.80 in (2005) |
| September 23 | 95.0°F (2017) | 37.0°F (2012) | 0.56 in (2005) |
| September 24 | 93.0°F (2017) | 34.0°F (2012) | 0.26 in (2022) |
| September 25 | 93.0°F (2017) | 37.9°F (2012) | 1.00 in (2011) |
| September 26 | 91.9°F (2017) | 39.9°F (2006) | 1.40 in (2011) |
| September 27 | 89.1°F (2017) | 39.9°F (2010) | 0.67 in (2023) |
| September 28 | 81.0°F (2008) | 36.0°F (2018) | 0.97 in (2011) |
| September 29 | 86.0°F (2025) | 30.9°F (2022) | 0.70 in (2018) |
| September 30 | 82.0°F (2014) | 34.0°F (2022) | 0.49 in (2018) |