September weather in Irondale, MO
The average temperature in Irondale in September is 67.4°F (56.9°F–77.8°F). Average precipitation: 3.89 inches.
September is a fall month in Irondale, and is warmer than the annual average of 54.8°F. Daily temperatures swing about 20.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 14m. For travel, September is one of the best months of the year to visit.
Avg High
77.8°F
Avg Low
56.9°F
Precipitation
3.89 in
Daylight
12h 14m
September records in Irondale
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1984) | 46.0°F (1896) | 2.59 in (2012) |
| September 2 | 97.0°F (2011) | 42.1°F (1895) | 1.08 in (2010) |
| September 3 | 97.0°F (2000) | 46.0°F (1901) | 1.90 in (1993) |
| September 4 | 99.0°F (1899) | 45.0°F (1902) | 2.40 in (2008) |
| September 5 | 100.9°F (1899) | 39.0°F (1902) | 2.58 in (2021) |
| September 6 | 100.0°F (1899) | 41.0°F (1896) | 1.56 in (2023) |
| September 7 | 100.0°F (1899) | 37.0°F (1898) | 1.46 in (2012) |
| September 8 | 98.1°F (1901) | 30.0°F (1898) | 3.39 in (2018) |
| September 9 | 98.1°F (1901) | 33.1°F (1898) | 1.86 in (1984) |
| September 10 | 93.9°F (2013) | 39.9°F (1898) | 2.66 in (2010) |
| September 11 | 93.9°F (2013) | 39.9°F (1894) | 1.62 in (1984) |
| September 12 | 93.0°F (2013) | 39.9°F (1899) | 2.90 in (1949) |
| September 13 | 95.0°F (2025) | 33.1°F (1902) | 1.23 in (1898) |
| September 14 | 100.0°F (1893) | 30.0°F (1902) | 3.08 in (2008) |
| September 15 | 99.0°F (1987) | 32.0°F (1902) | 2.44 in (2011) |
| September 16 | 93.9°F (2025) | 37.0°F (2000) | 1.93 in (1996) |
| September 17 | 93.0°F (2025) | 36.0°F (1981) | 2.46 in (2016) |
| September 18 | 93.0°F (2025) | 30.0°F (1901) | 2.10 in (1986) |
| September 19 | 93.9°F (2025) | 27.0°F (1901) | 1.78 in (2002) |
| September 20 | 91.0°F (2022) | 30.9°F (1897) | 1.20 in (1993) |
| September 21 | 93.0°F (2022) | 27.0°F (1897) | 2.75 in (1950) |
| September 22 | 91.9°F (2017) | 30.0°F (1987) | 3.33 in (1984) |
| September 23 | 91.9°F (2017) | 28.0°F (1896) | 3.50 in (1993) |
| September 24 | 91.9°F (1901) | 28.0°F (1896) | 2.93 in (1993) |
| September 25 | 91.0°F (1900) | 30.0°F (2001) | 2.42 in (1993) |
| September 26 | 91.9°F (1900) | 28.9°F (1899) | 0.80 in (1895) |
| September 27 | 88.0°F (2017) | 24.1°F (1899) | 1.44 in (2012) |
| September 28 | 90.0°F (1986) | 30.9°F (2003) | 1.67 in (2024) |
| September 29 | 88.0°F (1998) | 21.9°F (1899) | 0.86 in (2013) |
| September 30 | 91.9°F (1901) | 16.0°F (1899) | 1.67 in (1893) |