September weather in Unionville, IA
The average temperature in Unionville in September is 65.2°F (53.8°F–76.6°F). Average precipitation: 3.81 inches.
September is a fall month in Unionville, and is warmer than the annual average of 50.4°F. Daily temperatures swing about 22.8°F between overnight low and afternoon high. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
76.6°F
Avg Low
53.8°F
Precipitation
3.81 in
Daylight
12h 15m
September records in Unionville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (2000) | 46.9°F (1987) | 2.06 in (1980) |
| September 2 | 98.1°F (1984) | 46.0°F (1974) | 1.66 in (1977) |
| September 3 | 98.1°F (2000) | 39.9°F (1974) | 0.76 in (1993) |
| September 4 | 93.0°F (1983) | 33.1°F (1974) | 1.22 in (1991) |
| September 5 | 95.0°F (1990) | 37.0°F (1974) | 1.41 in (1975) |
| September 6 | 96.1°F (1990) | 37.0°F (1988) | 1.81 in (2018) |
| September 7 | 97.0°F (1990) | 42.1°F (1988) | 4.50 in (2015) |
| September 8 | 97.0°F (2013) | 37.9°F (1986) | 1.31 in (2020) |
| September 9 | 98.1°F (1971) | 44.1°F (1986) | 3.15 in (1989) |
| September 10 | 99.0°F (2013) | 37.0°F (1976) | 2.70 in (2014) |
| September 11 | 96.1°F (2013) | 41.0°F (1970) | 1.86 in (2023) |
| September 12 | 95.0°F (2000) | 41.0°F (1975) | 2.55 in (2003) |
| September 13 | 93.0°F (1991) | 37.0°F (2014) | 2.38 in (2008) |
| September 14 | 96.1°F (2025) | 35.1°F (1974) | 3.71 in (1998) |
| September 15 | 93.9°F (2025) | 37.0°F (1979) | 3.84 in (1992) |
| September 16 | 90.0°F (2017) | 37.0°F (1984) | 0.85 in (1988) |
| September 17 | 90.0°F (1997) | 41.0°F (1980) | 1.16 in (1977) |
| September 18 | 91.0°F (2018) | 39.0°F (1981) | 2.11 in (2022) |
| September 19 | 91.0°F (1972) | 35.1°F (1991) | 1.42 in (2007) |
| September 20 | 91.0°F (1972) | 33.1°F (1991) | 1.12 in (1986) |
| September 21 | 93.9°F (2022) | 33.1°F (1991) | 2.34 in (2017) |
| September 22 | 90.0°F (2016) | 32.0°F (1974) | 2.95 in (2010) |
| September 23 | 90.0°F (2017) | 32.0°F (1983) | 1.71 in (2000) |
| September 24 | 91.0°F (2017) | 30.9°F (1989) | 1.03 in (2010) |
| September 25 | 90.0°F (1984) | 34.0°F (1989) | 1.60 in (2009) |
| September 26 | 87.1°F (2017) | 32.0°F (1975) | 2.18 in (1976) |
| September 27 | 88.0°F (2021) | 33.1°F (1980) | 1.04 in (1999) |
| September 28 | 89.1°F (1971) | 36.0°F (1985) | 2.10 in (2019) |
| September 29 | 87.1°F (1971) | 30.0°F (1984) | 1.60 in (2019) |
| September 30 | 91.0°F (2023) | 32.0°F (1972) | 1.27 in (1985) |