September weather in Homer, IL
The average temperature in Homer in September is 66.8°F (55.7°F–77.9°F). Average precipitation: 3.35 inches.
September is a fall month in Homer, and is warmer than the annual average of 52.2°F. Daily temperatures swing about 22.2°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
77.9°F
Avg Low
55.7°F
Precipitation
3.35 in
Daylight
12h 15m
September records in Homer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2013) | 51.1°F (2023) | 3.54 in (2003) |
| September 2 | 98.1°F (2011) | 48.0°F (2017) | 3.14 in (2012) |
| September 3 | 97.0°F (2011) | 46.0°F (2017) | 1.42 in (2010) |
| September 4 | 96.1°F (2011) | 48.9°F (2025) | 0.60 in (2011) |
| September 5 | 91.9°F (2018) | 46.9°F (2025) | 1.57 in (2008) |
| September 6 | 93.9°F (2018) | 46.9°F (2011) | 0.45 in (2014) |
| September 7 | 89.1°F (2015) | 46.0°F (2011) | 0.58 in (2020) |
| September 8 | 90.0°F (2015) | 43.0°F (2024) | 4.23 in (2018) |
| September 9 | 88.0°F (2015) | 41.0°F (2024) | 1.24 in (2015) |
| September 10 | 91.0°F (2013) | 44.1°F (2024) | 1.73 in (2016) |
| September 11 | 91.9°F (2013) | 48.0°F (2017) | 1.01 in (2016) |
| September 12 | 91.9°F (2013) | 48.9°F (2017) | 0.45 in (2008) |
| September 13 | 91.0°F (2019) | 42.1°F (2014) | 0.37 in (2020) |
| September 14 | 89.1°F (2021) | 39.9°F (2014) | 0.44 in (2016) |
| September 15 | 93.0°F (2025) | 42.1°F (2011) | 2.91 in (2008) |
| September 16 | 91.9°F (2025) | 42.1°F (2011) | 0.96 in (2005) |
| September 17 | 91.0°F (2018) | 46.9°F (2011) | 0.37 in (2016) |
| September 18 | 91.9°F (2018) | 46.9°F (2014) | 0.48 in (2006) |
| September 19 | 91.0°F (2018) | 41.0°F (2020) | 2.25 in (2015) |
| September 20 | 93.0°F (2024) | 39.9°F (2020) | 0.86 in (2005) |
| September 21 | 95.0°F (2022) | 43.0°F (2020) | 1.76 in (2014) |
| September 22 | 95.0°F (2024) | 44.1°F (2012) | 0.79 in (2021) |
| September 23 | 93.0°F (2017) | 42.1°F (2012) | 0.80 in (2010) |
| September 24 | 90.0°F (2017) | 37.9°F (2012) | 0.93 in (2025) |
| September 25 | 93.0°F (2017) | 37.9°F (2012) | 0.70 in (2024) |
| September 26 | 91.9°F (2016) | 46.0°F (2021) | 1.22 in (2005) |
| September 27 | 90.0°F (2017) | 39.9°F (2022) | 1.95 in (2003) |
| September 28 | 93.0°F (2021) | 37.9°F (2022) | 0.28 in (2019) |
| September 29 | 91.0°F (2025) | 37.9°F (2022) | 0.61 in (2005) |
| September 30 | 93.9°F (2025) | 37.9°F (2022) | 0.57 in (2019) |