September weather in Altona, IL
The average temperature in Altona in September is 64.0°F (51.6°F–76.3°F). Average precipitation: 3.81 inches.
September is a fall month in Altona, and is warmer than the annual average of 49°F. Daily temperatures swing about 24.7°F between overnight low and afternoon high. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
76.3°F
Avg Low
51.6°F
Precipitation
3.81 in
Daylight
12h 15m
September records in Altona
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 89.1°F (2008) | 43.0°F (2009) | 1.82 in (2021) |
| September 2 | 96.1°F (2011) | 43.0°F (2017) | 2.18 in (2012) |
| September 3 | 93.9°F (2011) | 43.0°F (2017) | 0.79 in (2006) |
| September 4 | 91.9°F (2015) | 48.0°F (2013) | 1.76 in (2008) |
| September 5 | 93.0°F (2015) | 48.0°F (2017) | 0.21 in (2012) |
| September 6 | 91.0°F (2015) | 44.1°F (2011) | 0.79 in (2018) |
| September 7 | 91.9°F (2015) | 44.1°F (2011) | 2.05 in (2020) |
| September 8 | 91.0°F (2013) | 41.0°F (2024) | 1.64 in (2020) |
| September 9 | 84.9°F (2013) | 41.0°F (2024) | 1.52 in (2014) |
| September 10 | 97.0°F (2013) | 43.0°F (2008) | 2.35 in (2014) |
| September 11 | 96.1°F (2013) | 45.0°F (2017) | 0.44 in (2020) |
| September 12 | 93.0°F (2013) | 44.1°F (2014) | 2.34 in (2008) |
| September 13 | 91.0°F (2019) | 36.0°F (2014) | 3.21 in (2008) |
| September 14 | 86.0°F (2021) | 36.0°F (2014) | 0.42 in (2008) |
| September 15 | 90.0°F (2018) | 36.0°F (2011) | 1.43 in (2019) |
| September 16 | 89.1°F (2018) | 37.9°F (2011) | 0.36 in (2014) |
| September 17 | 89.1°F (2018) | 39.9°F (2014) | 0.19 in (2006) |
| September 18 | 91.9°F (2018) | 39.9°F (2012) | 0.31 in (2012) |
| September 19 | 87.1°F (2018) | 37.0°F (2012) | 2.51 in (2015) |
| September 20 | 91.0°F (2013) | 37.0°F (2006) | 2.02 in (2019) |
| September 21 | 93.9°F (2022) | 43.0°F (2012) | 1.12 in (2019) |
| September 22 | 88.0°F (2024) | 41.0°F (2012) | 2.07 in (2019) |
| September 23 | 91.9°F (2017) | 34.0°F (2012) | 1.31 in (2019) |
| September 24 | 93.0°F (2017) | 30.9°F (2012) | 0.56 in (2024) |
| September 25 | 90.0°F (2017) | 30.9°F (2012) | 0.47 in (2023) |
| September 26 | 90.0°F (2017) | 43.0°F (2011) | 1.02 in (2018) |
| September 27 | 89.1°F (2017) | 39.0°F (2022) | 1.55 in (2011) |
| September 28 | 87.1°F (2021) | 37.0°F (2022) | 4.57 in (2019) |
| September 29 | 84.0°F (2014) | 37.0°F (2012) | 0.48 in (2008) |
| September 30 | 87.1°F (2021) | 39.0°F (2009) | 0.88 in (2019) |