September weather in Ionia, MO
The average temperature in Ionia in September is 67.5°F (56.3°F–78.7°F). Average precipitation: 4.24 inches.
September is a fall month in Ionia, and is warmer than the annual average of 54.1°F. Daily temperatures swing about 22.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
78.7°F
Avg Low
56.3°F
Precipitation
4.24 in
Daylight
12h 14m
September records in Ionia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2011) | 52.0°F (2009) | 1.83 in (2010) |
| September 2 | 100.0°F (2011) | 52.0°F (2009) | 1.26 in (2013) |
| September 3 | 97.0°F (2011) | 54.0°F (2010) | 0.31 in (2008) |
| September 4 | 97.0°F (2012) | 46.0°F (2010) | 3.06 in (2008) |
| September 5 | 95.0°F (2012) | 46.0°F (2010) | 2.01 in (2009) |
| September 6 | 95.0°F (2012) | 46.0°F (2011) | 1.01 in (2018) |
| September 7 | 95.0°F (2015) | 46.0°F (2011) | 1.61 in (2007) |
| September 8 | 93.9°F (2012) | 46.0°F (2025) | 1.24 in (2018) |
| September 9 | 91.0°F (2013) | 46.9°F (2011) | 1.60 in (2016) |
| September 10 | 95.0°F (2013) | 51.1°F (2024) | 3.99 in (2016) |
| September 11 | 93.9°F (2013) | 50.0°F (2007) | 3.08 in (2010) |
| September 12 | 93.9°F (2013) | 46.9°F (2022) | 1.51 in (2008) |
| September 13 | 96.1°F (2025) | 41.0°F (2014) | 0.10 in (2008) |
| September 14 | 96.1°F (2025) | 39.9°F (2014) | 4.96 in (2008) |
| September 15 | 96.1°F (2025) | 41.0°F (2007) | 0.50 in (2011) |
| September 16 | 95.0°F (2025) | 39.9°F (2011) | 0.95 in (2010) |
| September 17 | 95.0°F (2025) | 46.9°F (2008) | 0.47 in (2025) |
| September 18 | 93.9°F (2025) | 46.9°F (2006) | 1.16 in (2013) |
| September 19 | 91.0°F (2018) | 42.1°F (2006) | 1.11 in (2022) |
| September 20 | 95.0°F (2022) | 44.1°F (2006) | 0.69 in (2013) |
| September 21 | 97.0°F (2024) | 48.0°F (2013) | 0.62 in (2021) |
| September 22 | 91.9°F (2022) | 46.0°F (2011) | 1.95 in (2009) |
| September 23 | 88.0°F (2007) | 43.0°F (2012) | 1.48 in (2019) |
| September 24 | 89.1°F (2017) | 43.0°F (2012) | 1.97 in (2024) |
| September 25 | 89.1°F (2016) | 42.1°F (2006) | 0.12 in (2025) |
| September 26 | 87.1°F (2017) | 39.0°F (2011) | 0.89 in (2007) |
| September 27 | 87.1°F (2020) | 39.0°F (2011) | 0.10 in (2012) |
| September 28 | 88.0°F (2019) | 41.0°F (2018) | 0.53 in (2020) |
| September 29 | 89.1°F (2021) | 39.9°F (2006) | 1.58 in (2019) |
| September 30 | 90.0°F (2023) | 35.1°F (2020) | 0.00 in (2006) |