September weather in Avon, IL
The average temperature in Avon in September is 63.9°F (51.0°F–76.8°F). Average precipitation: 3.65 inches.
September is a fall month in Avon, and is warmer than the annual average of 49.4°F. Daily temperatures swing about 25.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
76.8°F
Avg Low
51.0°F
Precipitation
3.65 in
Daylight
12h 15m
September records in Avon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2011) | 43.0°F (2009) | 2.60 in (2003) |
| September 2 | 99.0°F (2011) | 41.0°F (2017) | 0.68 in (2020) |
| September 3 | 98.1°F (2011) | 42.1°F (2017) | 1.09 in (1997) |
| September 4 | 91.9°F (2011) | 45.0°F (2024) | 1.51 in (2011) |
| September 5 | 91.0°F (2012) | 46.0°F (2025) | 1.29 in (2008) |
| September 6 | 89.1°F (2018) | 42.1°F (2025) | 1.49 in (2018) |
| September 7 | 87.1°F (2020) | 37.9°F (2025) | 1.90 in (2018) |
| September 8 | 86.0°F (2021) | 37.0°F (2024) | 2.60 in (1992) |
| September 9 | 82.9°F (2022) | 37.0°F (2024) | 1.44 in (1989) |
| September 10 | 84.9°F (2019) | 41.0°F (2024) | 4.10 in (2014) |
| September 11 | 87.1°F (2019) | 43.0°F (2017) | 1.81 in (2006) |
| September 12 | 88.0°F (2019) | 44.1°F (2017) | 2.04 in (2020) |
| September 13 | 90.0°F (2019) | 48.0°F (2022) | 2.26 in (1970) |
| September 14 | 93.0°F (2025) | 45.0°F (2022) | 3.95 in (1961) |
| September 15 | 93.9°F (2025) | 36.0°F (2011) | 1.46 in (1965) |
| September 16 | 88.0°F (2017) | 39.9°F (2011) | 2.10 in (2004) |
| September 17 | 89.1°F (2025) | 44.1°F (2008) | 2.86 in (1987) |
| September 18 | 91.0°F (2018) | 43.0°F (2009) | 1.41 in (1968) |
| September 19 | 91.0°F (2018) | 37.9°F (2020) | 2.30 in (2010) |
| September 20 | 91.0°F (2018) | 41.0°F (2020) | 1.10 in (2013) |
| September 21 | 95.0°F (2022) | 41.0°F (2020) | 1.42 in (2021) |
| September 22 | 88.0°F (2010) | 39.9°F (2012) | 2.02 in (1970) |
| September 23 | 93.0°F (2017) | 33.1°F (2012) | 3.50 in (2000) |
| September 24 | 91.9°F (2017) | 30.9°F (2012) | 5.72 in (1961) |
| September 25 | 90.0°F (2017) | 34.0°F (2012) | 0.95 in (1960) |
| September 26 | 91.0°F (2017) | 43.0°F (2011) | 1.50 in (1976) |
| September 27 | 89.1°F (2017) | 39.0°F (2010) | 0.95 in (1964) |
| September 28 | 89.1°F (2021) | 33.1°F (2022) | 4.00 in (1999) |
| September 29 | 88.0°F (2025) | 34.0°F (2022) | 1.00 in (1959) |
| September 30 | 89.1°F (2025) | 35.1°F (2022) | 1.83 in (1986) |