September weather in Farmington, IA
The average temperature in Farmington in September is 66.4°F (54.3°F–78.6°F). Average precipitation: 3.92 inches.
September is a fall month in Farmington, and is warmer than the annual average of 51.7°F. Daily temperatures swing about 24.3°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
78.6°F
Avg Low
54.3°F
Precipitation
3.92 in
Daylight
12h 15m
September records in Farmington
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (2011) | 46.9°F (2009) | 2.20 in (2003) |
| September 2 | 100.9°F (2011) | 48.9°F (2009) | 1.67 in (2012) |
| September 3 | 98.1°F (2011) | 50.0°F (2009) | 1.68 in (1942) |
| September 4 | 95.0°F (2011) | 46.9°F (2010) | 1.52 in (1980) |
| September 5 | 95.0°F (2012) | 48.0°F (2025) | 2.40 in (1971) |
| September 6 | 93.9°F (2015) | 44.1°F (2011) | 3.64 in (2018) |
| September 7 | 95.0°F (2015) | 44.1°F (2025) | 1.70 in (1995) |
| September 8 | 98.1°F (2013) | 42.1°F (2024) | 2.08 in (1992) |
| September 9 | 90.0°F (2013) | 43.0°F (2008) | 1.22 in (2008) |
| September 10 | 102.0°F (2013) | 43.0°F (2020) | 3.10 in (2014) |
| September 11 | 100.0°F (2013) | 48.0°F (2007) | 1.69 in (2010) |
| September 12 | 93.0°F (2013) | 41.0°F (2007) | 1.38 in (2020) |
| September 13 | 91.0°F (2019) | 37.9°F (2014) | 4.91 in (2008) |
| September 14 | 97.0°F (2025) | 39.0°F (2014) | 4.70 in (1961) |
| September 15 | 97.0°F (2025) | 36.0°F (2007) | 2.10 in (1967) |
| September 16 | 91.9°F (2025) | 37.0°F (2011) | 1.48 in (1983) |
| September 17 | 91.0°F (2018) | 43.0°F (2014) | 1.36 in (1980) |
| September 18 | 91.9°F (2015) | 42.1°F (2012) | 1.84 in (2022) |
| September 19 | 91.0°F (2013) | 42.1°F (2012) | 1.87 in (2001) |
| September 20 | 93.9°F (2013) | 37.9°F (2006) | 1.81 in (1986) |
| September 21 | 95.0°F (2022) | 37.9°F (2006) | 2.03 in (1965) |
| September 22 | 91.0°F (2016) | 45.0°F (2013) | 2.67 in (1970) |
| September 23 | 91.9°F (2017) | 37.0°F (2012) | 2.00 in (1959) |
| September 24 | 93.0°F (2017) | 37.0°F (2012) | 2.59 in (1961) |
| September 25 | 90.0°F (2016) | 39.9°F (2011) | 1.88 in (2009) |
| September 26 | 88.0°F (2017) | 43.0°F (2011) | 2.05 in (1976) |
| September 27 | 88.0°F (2021) | 43.0°F (2010) | 1.85 in (1964) |
| September 28 | 87.1°F (2021) | 36.0°F (2022) | 3.40 in (1999) |
| September 29 | 88.0°F (2025) | 36.0°F (2022) | 0.73 in (1999) |
| September 30 | 88.0°F (2023) | 41.0°F (2009) | 1.76 in (1986) |