September weather in Shelbyville, IL
The average temperature in Shelbyville in September is 68.1°F (56.6°F–79.6°F). Average precipitation: 3.06 inches.
September is a fall month in Shelbyville, and is warmer than the annual average of 53.6°F. Daily temperatures swing about 23°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
79.6°F
Avg Low
56.6°F
Precipitation
3.06 in
Daylight
12h 15m
September records in Shelbyville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2013) | 46.0°F (1987) | 4.00 in (2003) |
| September 2 | 98.1°F (2011) | 48.9°F (1987) | 1.40 in (2012) |
| September 3 | 97.0°F (2011) | 46.0°F (2018) | 3.23 in (2010) |
| September 4 | 97.0°F (2007) | 48.9°F (1997) | 0.60 in (1996) |
| September 5 | 96.1°F (1999) | 45.0°F (1997) | 1.70 in (2008) |
| September 6 | 97.0°F (1999) | 44.1°F (1988) | 0.91 in (2007) |
| September 7 | 95.0°F (2015) | 44.1°F (1988) | 0.49 in (2007) |
| September 8 | 95.0°F (2002) | 39.0°F (1986) | 1.45 in (1984) |
| September 9 | 96.1°F (1983) | 45.0°F (1986) | 0.76 in (2015) |
| September 10 | 95.0°F (1983) | 39.9°F (1999) | 0.85 in (2016) |
| September 11 | 97.0°F (2013) | 46.0°F (1976) | 1.40 in (2000) |
| September 12 | 91.9°F (2005) | 46.9°F (1976) | 1.23 in (1951) |
| September 13 | 95.0°F (2013) | 42.1°F (2014) | 0.87 in (1977) |
| September 14 | 96.1°F (2025) | 41.0°F (1996) | 1.22 in (1977) |
| September 15 | 96.1°F (2025) | 42.1°F (1996) | 2.22 in (1981) |
| September 16 | 93.0°F (2025) | 43.0°F (1984) | 0.77 in (2014) |
| September 17 | 91.9°F (2018) | 44.1°F (1979) | 0.93 in (2016) |
| September 18 | 91.9°F (1983) | 43.0°F (2012) | 0.95 in (2006) |
| September 19 | 93.9°F (2025) | 39.0°F (2012) | 1.35 in (2022) |
| September 20 | 91.0°F (1978) | 39.9°F (2006) | 1.53 in (1986) |
| September 21 | 93.9°F (2022) | 39.0°F (1983) | 1.01 in (2021) |
| September 22 | 95.0°F (2017) | 33.1°F (1983) | 0.64 in (2021) |
| September 23 | 95.0°F (2017) | 34.0°F (1983) | 0.85 in (1984) |
| September 24 | 93.0°F (2017) | 34.0°F (2012) | 1.12 in (2024) |
| September 25 | 91.9°F (2017) | 37.0°F (2001) | 1.31 in (2000) |
| September 26 | 91.0°F (2017) | 36.0°F (2001) | 1.46 in (2005) |
| September 27 | 91.0°F (2017) | 39.0°F (2000) | 1.91 in (1981) |
| September 28 | 91.9°F (1998) | 39.0°F (2000) | 0.63 in (2024) |
| September 29 | 90.0°F (1999) | 37.9°F (2003) | 1.52 in (1987) |
| September 30 | 90.0°F (2025) | 37.9°F (1999) | 1.05 in (1986) |