September weather in Des Moines, IA
The average temperature in Des Moines in September is 66.2°F (55.4°F–76.9°F). Average precipitation: 3.18 inches.
September is a fall month in Des Moines, and is warmer than the annual average of 50.9°F. Daily temperatures swing about 21.5°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.9°F
Avg Low
55.4°F
Precipitation
3.18 in
Daylight
12h 16m
September records in Des Moines
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1984) | 37.9°F (1949) | 1.54 in (2022) |
| September 2 | 98.1°F (2000) | 45.0°F (1946) | 1.38 in (1961) |
| September 3 | 96.1°F (1983) | 39.9°F (1974) | 2.31 in (2018) |
| September 4 | 97.0°F (2012) | 42.1°F (1974) | 1.98 in (1994) |
| September 5 | 96.1°F (1990) | 45.0°F (1962) | 1.69 in (1958) |
| September 6 | 97.0°F (1990) | 42.1°F (1988) | 1.93 in (2007) |
| September 7 | 97.0°F (1978) | 41.0°F (1986) | 2.57 in (2001) |
| September 8 | 99.0°F (1947) | 39.9°F (1986) | 2.33 in (1989) |
| September 9 | 100.9°F (2013) | 44.1°F (1995) | 3.00 in (2014) |
| September 10 | 99.0°F (2013) | 44.1°F (1976) | 2.61 in (1972) |
| September 11 | 97.0°F (2000) | 39.9°F (1955) | 1.12 in (2003) |
| September 12 | 93.9°F (1984) | 42.1°F (1975) | 4.42 in (1961) |
| September 13 | 96.1°F (2025) | 39.0°F (1949) | 2.22 in (1978) |
| September 14 | 91.9°F (1955) | 39.0°F (1996) | 1.33 in (1992) |
| September 15 | 96.1°F (1955) | 37.0°F (2007) | 1.08 in (2016) |
| September 16 | 93.9°F (1955) | 37.9°F (1984) | 0.77 in (2016) |
| September 17 | 93.0°F (1953) | 37.9°F (1980) | 1.26 in (1982) |
| September 18 | 93.0°F (1947) | 37.9°F (1991) | 2.55 in (2015) |
| September 19 | 96.1°F (1948) | 33.1°F (1991) | 1.67 in (1983) |
| September 20 | 93.9°F (2022) | 33.1°F (1991) | 1.83 in (1965) |
| September 21 | 93.0°F (2005) | 35.1°F (1995) | 0.67 in (2003) |
| September 22 | 91.9°F (2017) | 30.9°F (1995) | 1.77 in (1961) |
| September 23 | 91.9°F (2017) | 32.0°F (1983) | 1.47 in (2010) |
| September 24 | 91.9°F (2017) | 32.0°F (1965) | 1.50 in (2016) |
| September 25 | 88.0°F (1956) | 37.0°F (1947) | 3.29 in (1993) |
| September 26 | 90.0°F (1956) | 30.9°F (1984) | 1.05 in (1959) |
| September 27 | 91.0°F (1956) | 37.0°F (1951) | 3.25 in (1945) |
| September 28 | 99.0°F (1953) | 30.9°F (1951) | 3.06 in (1973) |
| September 29 | 91.0°F (2023) | 28.0°F (1984) | 1.38 in (1985) |
| September 30 | 91.9°F (1952) | 30.0°F (1984) | 0.80 in (1945) |