September weather in Tolono, IL
The average temperature in Tolono in September is 67.0°F (54.5°F–79.4°F). Average precipitation: 3.05 inches.
September is a fall month in Tolono, and is warmer than the annual average of 52.5°F. Daily temperatures swing about 24.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
79.4°F
Avg Low
54.5°F
Precipitation
3.05 in
Daylight
12h 15m
September records in Tolono
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (2011) | 50.0°F (2009) | 3.05 in (2012) |
| September 2 | 98.1°F (2011) | 45.0°F (2017) | 1.16 in (2010) |
| September 3 | 97.0°F (2011) | -53.0°F (1998) | 0.70 in (2008) |
| September 4 | 96.1°F (2007) | 46.9°F (1997) | 1.86 in (2008) |
| September 5 | 97.0°F (2018) | 43.0°F (1997) | 0.53 in (2014) |
| September 6 | 95.0°F (2015) | 43.0°F (2025) | 1.15 in (2020) |
| September 7 | 93.9°F (2015) | 39.0°F (2025) | 3.11 in (2018) |
| September 8 | 91.9°F (2015) | 42.1°F (2024) | 1.49 in (2016) |
| September 9 | 96.1°F (2013) | 45.0°F (2024) | 2.41 in (2016) |
| September 10 | 98.1°F (2013) | 44.1°F (1999) | 0.96 in (2000) |
| September 11 | 95.0°F (2013) | 48.0°F (1998) | 0.54 in (2015) |
| September 12 | 99.0°F (2014) | 44.1°F (2007) | 0.99 in (2000) |
| September 13 | 96.1°F (2025) | 39.0°F (2014) | 0.09 in (2003) |
| September 14 | 95.0°F (2025) | 42.1°F (2014) | 3.61 in (2008) |
| September 15 | 91.9°F (2025) | 37.0°F (2007) | 0.74 in (2014) |
| September 16 | 93.0°F (2018) | 39.0°F (2000) | 0.19 in (2016) |
| September 17 | 93.9°F (2018) | 41.0°F (1999) | 0.54 in (2006) |
| September 18 | 93.9°F (2018) | 41.0°F (2012) | 1.39 in (2015) |
| September 19 | 93.9°F (2005) | 19.0°F (1999) | 1.22 in (2022) |
| September 20 | 95.0°F (2017) | 37.0°F (2006) | 1.02 in (2002) |
| September 21 | 97.0°F (2010) | -0.8°F (2008) | 0.99 in (2021) |
| September 22 | 95.0°F (2005) | 35.1°F (1999) | 0.65 in (2010) |
| September 23 | 93.9°F (2017) | -0.8°F (2008) | 0.86 in (2005) |
| September 24 | 93.9°F (2017) | -0.8°F (2008) | 1.69 in (2024) |
| September 25 | 93.0°F (2017) | -0.8°F (2008) | 1.60 in (2005) |
| September 26 | 93.0°F (2017) | 13.1°F (2008) | 1.44 in (2003) |
| September 27 | 91.9°F (1998) | 37.0°F (2022) | 0.37 in (2011) |
| September 28 | 91.0°F (2025) | -0.8°F (2008) | 1.30 in (1999) |
| September 29 | 91.9°F (2025) | 35.1°F (2003) | 1.09 in (2019) |
| September 30 | 91.0°F (2019) | 35.1°F (2003) | 0.42 in (2016) |