September weather in Oreana, IL
The average temperature in Oreana in September is 67.0°F (55.0°F–78.9°F). Average precipitation: 2.98 inches.
September is a fall month in Oreana, and is warmer than the annual average of 53.1°F. Daily temperatures swing about 23.9°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
78.9°F
Avg Low
55.0°F
Precipitation
2.98 in
Daylight
12h 15m
September records in Oreana
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (2011) | 46.0°F (2009) | 2.64 in (2012) |
| September 2 | 100.9°F (2011) | 46.9°F (2009) | 2.62 in (2010) |
| September 3 | 98.1°F (2011) | 50.0°F (2024) | 2.42 in (2022) |
| September 4 | 98.1°F (2007) | 50.0°F (2024) | 2.63 in (2008) |
| September 5 | 93.0°F (2014) | 46.0°F (2003) | 0.61 in (2012) |
| September 6 | 96.1°F (2015) | 46.9°F (2003) | 1.01 in (2009) |
| September 7 | 95.0°F (2015) | 46.0°F (2017) | 3.06 in (2018) |
| September 8 | 91.9°F (2002) | 42.1°F (2025) | 1.32 in (2016) |
| September 9 | 96.1°F (2013) | 44.1°F (2025) | 0.73 in (2001) |
| September 10 | 97.0°F (2013) | 44.1°F (2017) | 0.81 in (2014) |
| September 11 | 95.0°F (2013) | 44.1°F (2017) | 1.50 in (2022) |
| September 12 | 91.9°F (2005) | 46.9°F (2002) | 0.63 in (2008) |
| September 13 | 97.0°F (2025) | 42.1°F (2014) | 0.08 in (2017) |
| September 14 | 99.0°F (2025) | 39.9°F (2014) | 4.99 in (2008) |
| September 15 | 93.9°F (2025) | 39.9°F (2007) | 1.23 in (2014) |
| September 16 | 93.0°F (2018) | 46.9°F (2012) | 0.44 in (2016) |
| September 17 | 93.0°F (2018) | 45.0°F (2014) | 0.91 in (2002) |
| September 18 | 95.0°F (2025) | 44.1°F (2020) | 0.39 in (2001) |
| September 19 | 93.0°F (2005) | 37.0°F (2020) | 1.02 in (2005) |
| September 20 | 93.9°F (2018) | 39.0°F (2003) | 0.70 in (2025) |
| September 21 | 93.9°F (2017) | 41.0°F (2003) | 1.25 in (2021) |
| September 22 | 93.9°F (2005) | 44.1°F (2013) | 1.01 in (2010) |
| September 23 | 93.9°F (2007) | 39.9°F (2012) | 1.38 in (2005) |
| September 24 | 93.0°F (2007) | 35.1°F (2012) | 1.04 in (2024) |
| September 25 | 91.9°F (2017) | 39.0°F (2001) | 1.47 in (2005) |
| September 26 | 91.0°F (2017) | 0.1°F (2008) | 0.49 in (2003) |
| September 27 | 90.0°F (2021) | 41.0°F (2007) | 0.45 in (2019) |
| September 28 | 91.9°F (2025) | 41.0°F (2001) | 0.47 in (2019) |
| September 29 | 93.0°F (2025) | 37.9°F (2022) | 1.70 in (2019) |
| September 30 | 89.1°F (2019) | 39.0°F (2003) | 0.06 in (2007) |