September weather in Clinton, WI
The average temperature in Clinton in September is 62.5°F (51.2°F–73.8°F). Average precipitation: 3.84 inches.
September is a fall month in Clinton, and is warmer than the annual average of 47°F. Daily temperatures swing about 22.6°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
73.8°F
Avg Low
51.2°F
Precipitation
3.84 in
Daylight
12h 16m
September records in Clinton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (2012) | 41.0°F (2009) | 2.15 in (1989) |
| September 2 | 90.0°F (2011) | 41.0°F (2017) | 1.34 in (2018) |
| September 3 | 90.0°F (2008) | 45.0°F (2013) | 2.45 in (1970) |
| September 4 | 91.0°F (2012) | 39.0°F (2025) | 1.68 in (1973) |
| September 5 | 91.9°F (2012) | 42.1°F (2010) | 2.40 in (2008) |
| September 6 | 87.1°F (2012) | 42.1°F (2017) | 2.81 in (1970) |
| September 7 | 90.0°F (2016) | 39.0°F (2025) | 3.10 in (1980) |
| September 8 | 89.1°F (2002) | 36.0°F (2024) | 1.72 in (1985) |
| September 9 | 90.0°F (2002) | 41.0°F (2008) | 2.22 in (2001) |
| September 10 | 91.0°F (2005) | 41.0°F (2008) | 2.10 in (2019) |
| September 11 | 93.0°F (2013) | 39.9°F (2007) | 1.70 in (2022) |
| September 12 | 88.0°F (2005) | 43.0°F (2014) | 3.15 in (2019) |
| September 13 | 89.1°F (2005) | 37.0°F (2014) | 3.30 in (1961) |
| September 14 | 84.9°F (2004) | 30.0°F (2007) | 2.00 in (1961) |
| September 15 | 84.9°F (2024) | 35.1°F (2011) | 1.36 in (1970) |
| September 16 | 86.0°F (2024) | 39.0°F (2011) | 1.98 in (1997) |
| September 17 | 87.1°F (2024) | 37.9°F (2014) | 1.47 in (1970) |
| September 18 | 87.1°F (2007) | 43.0°F (2012) | 2.25 in (2015) |
| September 19 | 87.1°F (2025) | 34.0°F (2012) | 1.65 in (1997) |
| September 20 | 89.1°F (2013) | 37.9°F (2006) | 2.11 in (1963) |
| September 21 | 90.0°F (2017) | 41.0°F (2012) | 2.32 in (1948) |
| September 22 | 91.0°F (2017) | 36.0°F (2014) | 1.78 in (2000) |
| September 23 | 93.0°F (2017) | 32.0°F (2012) | 0.97 in (2009) |
| September 24 | 95.0°F (2017) | 30.9°F (2012) | 1.12 in (1970) |
| September 25 | 89.1°F (2017) | 37.0°F (2006) | 2.96 in (1986) |
| September 26 | 91.0°F (2017) | 37.0°F (2001) | 1.82 in (1959) |
| September 27 | 87.1°F (2017) | 36.0°F (2010) | 2.20 in (1999) |
| September 28 | 87.1°F (2021) | 33.1°F (2003) | 1.39 in (1959) |
| September 29 | 84.0°F (2002) | 32.0°F (2022) | 1.86 in (1986) |
| September 30 | 88.0°F (2025) | 28.0°F (2003) | 1.14 in (1961) |