September weather in Wilton, IA
The average temperature in Wilton in September is 65.4°F (54.3°F–76.5°F). Average precipitation: 3.45 inches.
September is a fall month in Wilton, and is warmer than the annual average of 50.1°F. Daily temperatures swing about 22.2°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.5°F
Avg Low
54.3°F
Precipitation
3.45 in
Daylight
12h 16m
September records in Wilton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2000) | 46.9°F (2009) | 1.02 in (2010) |
| September 2 | 99.0°F (2000) | 46.9°F (2009) | 0.89 in (2018) |
| September 3 | 97.0°F (2000) | 51.1°F (2013) | 2.34 in (2018) |
| September 4 | 93.0°F (1999) | 46.9°F (2025) | 0.90 in (2011) |
| September 5 | 93.0°F (1999) | 46.9°F (2025) | 1.89 in (2008) |
| September 6 | 91.0°F (2005) | 46.0°F (2011) | 0.83 in (2018) |
| September 7 | 93.0°F (2015) | 45.0°F (2011) | 0.59 in (2007) |
| September 8 | 93.9°F (2013) | 43.0°F (2024) | 1.99 in (2020) |
| September 9 | 91.9°F (2000) | 43.0°F (2024) | 1.10 in (2020) |
| September 10 | 99.0°F (2013) | 46.9°F (2008) | 2.07 in (2014) |
| September 11 | 97.0°F (2013) | 46.0°F (1999) | 1.91 in (2020) |
| September 12 | 97.0°F (2000) | 46.0°F (2007) | 0.72 in (2020) |
| September 13 | 91.0°F (2025) | 39.0°F (2014) | 2.27 in (2008) |
| September 14 | 98.1°F (2025) | 39.0°F (2014) | 2.59 in (2003) |
| September 15 | 95.0°F (2025) | 39.0°F (2007) | 2.96 in (2019) |
| September 16 | 91.9°F (2025) | 37.9°F (2007) | 0.82 in (2004) |
| September 17 | 91.9°F (2025) | 42.1°F (2000) | 0.09 in (2017) |
| September 18 | 90.0°F (2018) | 42.1°F (1999) | 1.31 in (2022) |
| September 19 | 88.0°F (2007) | 42.1°F (2012) | 3.21 in (2001) |
| September 20 | 93.0°F (2013) | 42.1°F (2006) | 0.88 in (2013) |
| September 21 | 96.1°F (2022) | 39.9°F (2006) | 2.37 in (2017) |
| September 22 | 90.0°F (2007) | 39.0°F (1999) | 1.40 in (2019) |
| September 23 | 91.9°F (2017) | 39.0°F (1999) | 1.33 in (2000) |
| September 24 | 93.0°F (2017) | 36.0°F (2012) | 0.45 in (2010) |
| September 25 | 91.0°F (2017) | 36.0°F (2002) | 0.42 in (2019) |
| September 26 | 91.0°F (2017) | 37.0°F (2001) | 1.44 in (2007) |
| September 27 | 88.0°F (2025) | 39.0°F (2001) | 0.73 in (2011) |
| September 28 | 90.0°F (2025) | 37.0°F (2022) | 2.29 in (1999) |
| September 29 | 90.0°F (2025) | 37.0°F (2003) | 0.51 in (2005) |
| September 30 | 91.0°F (2025) | 35.1°F (2003) | 0.31 in (2015) |