September weather in Postville, IA
The average temperature in Postville in September is 61.6°F (49.2°F–74.0°F). Average precipitation: 3.96 inches.
September is a fall month in Postville, and is warmer than the annual average of 46°F. Daily temperatures swing about 24.8°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
74.0°F
Avg Low
49.2°F
Precipitation
3.96 in
Daylight
12h 17m
September records in Postville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (1913) | 37.9°F (1909) | 3.12 in (1897) |
| September 2 | 93.0°F (1913) | 32.0°F (1919) | 1.47 in (1992) |
| September 3 | 97.0°F (1939) | 42.1°F (1909) | 1.35 in (1934) |
| September 4 | 96.1°F (2023) | 37.0°F (1909) | 1.38 in (2018) |
| September 5 | 95.0°F (2023) | 36.0°F (1988) | 2.91 in (2012) |
| September 6 | 96.1°F (1939) | 37.9°F (1988) | 3.07 in (1938) |
| September 7 | 99.0°F (1939) | 39.0°F (2024) | 1.89 in (1916) |
| September 8 | 96.1°F (1933) | 39.9°F (1988) | 1.58 in (1941) |
| September 9 | 91.0°F (1937) | 37.0°F (2008) | 2.22 in (1920) |
| September 10 | 95.0°F (2013) | 34.0°F (1917) | 1.69 in (1896) |
| September 11 | 93.0°F (2013) | 34.0°F (1917) | 4.60 in (2006) |
| September 12 | 93.9°F (1927) | 33.1°F (1902) | 3.12 in (1991) |
| September 13 | 93.9°F (1927) | 32.0°F (2014) | 2.11 in (1928) |
| September 14 | 96.1°F (1939) | 32.0°F (1923) | 2.43 in (1993) |
| September 15 | 95.0°F (1939) | 28.9°F (2007) | 2.53 in (1936) |
| September 16 | 91.9°F (1931) | 32.0°F (1937) | 2.01 in (2016) |
| September 17 | 91.9°F (1988) | 32.0°F (1916) | 1.44 in (1906) |
| September 18 | 93.0°F (2018) | 30.0°F (1929) | 2.06 in (1988) |
| September 19 | 90.0°F (1925) | 34.0°F (1917) | 2.65 in (1905) |
| September 20 | 89.1°F (1919) | 32.0°F (1916) | 2.67 in (2018) |
| September 21 | 91.0°F (1937) | 19.9°F (1918) | 1.62 in (1988) |
| September 22 | 91.9°F (1937) | 26.1°F (1989) | 3.48 in (2016) |
| September 23 | 91.9°F (2017) | 28.0°F (1989) | 1.73 in (2023) |
| September 24 | 91.9°F (2017) | 28.0°F (2002) | 2.00 in (1910) |
| September 25 | 89.1°F (2017) | 27.0°F (1926) | 2.75 in (1931) |
| September 26 | 87.1°F (2017) | 25.0°F (1926) | 1.42 in (2018) |
| September 27 | 87.1°F (2025) | 30.0°F (1942) | 2.53 in (1908) |
| September 28 | 90.0°F (1939) | 24.1°F (1942) | 0.70 in (1937) |
| September 29 | 84.0°F (2024) | 28.0°F (1908) | 1.15 in (1893) |
| September 30 | 87.1°F (2025) | 26.1°F (1899) | 1.49 in (1913) |