September weather in La Crosse, WI
The average temperature in La Crosse in September is 61.4°F (52.0°F–70.8°F). Average precipitation: 4.00 inches.
September is a fall month in La Crosse, and is warmer than the annual average of 45.6°F. Daily temperatures swing about 18.8°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
70.8°F
Avg Low
52.0°F
Precipitation
4.00 in
Daylight
12h 17m
September records in La Crosse
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 89.1°F (2000) | 44.1°F (2017) | 2.20 in (2010) |
| September 2 | 89.1°F (2011) | 51.1°F (2009) | 1.11 in (2002) |
| September 3 | 87.1°F (2008) | 46.0°F (2025) | 1.07 in (2018) |
| September 4 | 88.0°F (2012) | 39.9°F (2025) | 1.88 in (2011) |
| September 5 | 86.0°F (2007) | 46.0°F (2000) | 0.54 in (2016) |
| September 6 | 86.0°F (2007) | 43.0°F (2025) | 1.52 in (2016) |
| September 7 | 90.0°F (2003) | 39.0°F (2024) | 1.72 in (2001) |
| September 8 | 88.0°F (2003) | 43.0°F (2020) | 2.47 in (2001) |
| September 9 | 88.0°F (2013) | 42.1°F (2008) | 1.84 in (2016) |
| September 10 | 88.0°F (2002) | 41.0°F (2020) | 0.90 in (2022) |
| September 11 | 87.1°F (2005) | 41.0°F (2014) | 1.40 in (2006) |
| September 12 | 87.1°F (2005) | 39.0°F (2014) | 2.37 in (2019) |
| September 13 | 84.0°F (2005) | 35.1°F (2014) | 0.89 in (2003) |
| September 14 | 84.9°F (2025) | 42.1°F (2007) | 2.26 in (2005) |
| September 15 | 87.1°F (2017) | 33.1°F (2011) | 1.76 in (2004) |
| September 16 | 84.0°F (2025) | 33.1°F (2011) | 1.22 in (2010) |
| September 17 | 87.1°F (2018) | 41.0°F (2000) | 0.87 in (2015) |
| September 18 | 82.9°F (2024) | 37.9°F (2020) | 1.00 in (2018) |
| September 19 | 84.0°F (2000) | 43.0°F (2006) | 1.12 in (2024) |
| September 20 | 84.9°F (2022) | 37.0°F (2006) | 1.22 in (2018) |
| September 21 | 84.0°F (2017) | 37.9°F (2006) | 2.68 in (2016) |
| September 22 | 89.1°F (2017) | 36.0°F (2012) | 1.76 in (2025) |
| September 23 | 89.1°F (2017) | 33.1°F (2012) | 3.04 in (2010) |
| September 24 | 88.0°F (2017) | 33.1°F (2000) | 0.95 in (2010) |
| September 25 | 82.9°F (2017) | 34.0°F (2001) | 1.50 in (2005) |
| September 26 | 79.0°F (2025) | 35.1°F (2001) | 0.57 in (2005) |
| September 27 | 80.1°F (2008) | 37.0°F (2010) | 0.97 in (2011) |
| September 28 | 78.1°F (2014) | 34.0°F (2022) | 0.43 in (2013) |
| September 29 | 82.9°F (2025) | 33.1°F (2003) | 0.50 in (2005) |
| September 30 | 84.9°F (2019) | 33.1°F (2003) | 0.22 in (2011) |