September weather in Missouri Valley, IA
The average temperature in Missouri Valley in September is 64.4°F (51.3°F–77.5°F). Average precipitation: 3.54 inches.
September is a fall month in Missouri Valley, and is warmer than the annual average of 49.1°F. Daily temperatures swing about 26.2°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
77.5°F
Avg Low
51.3°F
Precipitation
3.54 in
Daylight
12h 16m
September records in Missouri Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1937) | 39.9°F (1949) | 2.33 in (2025) |
| September 2 | 100.0°F (1937) | 39.9°F (1893) | 3.25 in (1992) |
| September 3 | 104.0°F (1939) | 34.0°F (1974) | 3.04 in (1912) |
| September 4 | 100.0°F (2000) | 39.0°F (1902) | 3.51 in (1956) |
| September 5 | 100.0°F (1913) | 39.0°F (1962) | 1.38 in (1999) |
| September 6 | 107.1°F (1939) | 39.9°F (1896) | 1.50 in (1905) |
| September 7 | 106.0°F (1939) | 37.9°F (1934) | 1.98 in (1965) |
| September 8 | 100.0°F (1947) | 37.9°F (1986) | 2.87 in (2015) |
| September 9 | 100.0°F (1955) | 36.0°F (1943) | 2.61 in (2020) |
| September 10 | 100.0°F (1931) | 37.9°F (1976) | 3.02 in (2014) |
| September 11 | 98.1°F (1939) | 34.0°F (1940) | 2.26 in (1900) |
| September 12 | 100.9°F (1939) | 30.0°F (1902) | 2.88 in (1949) |
| September 13 | 102.0°F (1939) | 28.0°F (1902) | 2.15 in (1978) |
| September 14 | 100.9°F (1939) | 35.1°F (1904) | 1.52 in (1992) |
| September 15 | 104.0°F (1939) | 32.0°F (1916) | 2.25 in (1986) |
| September 16 | 100.9°F (1931) | 33.1°F (1934) | 3.37 in (2016) |
| September 17 | 98.1°F (1895) | 30.9°F (1900) | 1.40 in (2006) |
| September 18 | 98.1°F (1948) | 26.1°F (1901) | 2.10 in (1926) |
| September 19 | 97.0°F (1939) | 27.0°F (1991) | 3.10 in (1906) |
| September 20 | 96.1°F (1940) | 27.0°F (1918) | 1.40 in (1983) |
| September 21 | 100.0°F (1937) | 28.0°F (1918) | 1.85 in (2018) |
| September 22 | 99.0°F (1937) | 27.0°F (1995) | 1.42 in (2019) |
| September 23 | 93.9°F (2017) | 27.0°F (1983) | 1.73 in (2015) |
| September 24 | 91.9°F (1935) | 27.0°F (1942) | 2.22 in (2015) |
| September 25 | 91.0°F (1897) | 28.0°F (1926) | 1.58 in (2016) |
| September 26 | 91.9°F (1998) | 27.0°F (1928) | 5.20 in (1973) |
| September 27 | 91.9°F (1990) | 28.0°F (1942) | 2.03 in (1923) |
| September 28 | 93.9°F (1953) | 19.9°F (1899) | 1.38 in (1988) |
| September 29 | 91.0°F (1981) | 19.0°F (1899) | 1.67 in (1923) |
| September 30 | 95.0°F (2023) | 24.1°F (1895) | 1.50 in (1961) |