September weather in Hartford, IA
The average temperature in Hartford in September is 64.3°F (52.8°F–75.9°F). Average precipitation: 3.16 inches.
September is a fall month in Hartford, and is warmer than the annual average of 49.5°F. Daily temperatures swing about 23.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
75.9°F
Avg Low
52.8°F
Precipitation
3.16 in
Daylight
12h 16m
September records in Hartford
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 92.8°F (2011) | 45.3°F (2009) | 2.17 in (2018) |
| September 2 | 95.2°F (2023) | 48.2°F (2009) | 0.66 in (2006) |
| September 3 | 96.1°F (2023) | 45.5°F (2013) | 2.93 in (2018) |
| September 4 | 96.8°F (2023) | 44.4°F (2025) | 0.38 in (2008) |
| September 5 | 93.0°F (2023) | 45.0°F (2008) | 0.83 in (2018) |
| September 6 | 92.5°F (2020) | 43.7°F (2017) | 1.81 in (2007) |
| September 7 | 96.3°F (2013) | 39.9°F (2025) | 0.98 in (2016) |
| September 8 | 89.4°F (2013) | 43.9°F (2008) | 1.27 in (2020) |
| September 9 | 99.7°F (2013) | 41.4°F (2008) | 2.77 in (2014) |
| September 10 | 97.0°F (2013) | 47.5°F (2018) | 1.38 in (2006) |
| September 11 | 92.3°F (2012) | 44.6°F (2007) | 1.08 in (2020) |
| September 12 | 87.3°F (2005) | 38.7°F (2007) | 2.46 in (2008) |
| September 13 | 94.8°F (2025) | 34.9°F (2014) | 0.66 in (2016) |
| September 14 | 91.6°F (2025) | 38.5°F (2007) | 0.08 in (2019) |
| September 15 | 90.9°F (2017) | 32.0°F (2007) | 1.67 in (2016) |
| September 16 | 90.7°F (2025) | 39.9°F (2014) | 0.58 in (2016) |
| September 17 | 89.2°F (2018) | 46.0°F (2012) | 1.16 in (2017) |
| September 18 | 89.8°F (2013) | 38.3°F (2012) | 1.35 in (2015) |
| September 19 | 89.8°F (2021) | 39.2°F (2006) | 1.09 in (2013) |
| September 20 | 95.7°F (2022) | 34.5°F (2006) | 0.36 in (2021) |
| September 21 | 91.4°F (2005) | 42.4°F (2013) | 0.71 in (2010) |
| September 22 | 90.1°F (2017) | 37.6°F (2012) | 1.02 in (2019) |
| September 23 | 90.7°F (2017) | 30.9°F (2012) | 0.50 in (2010) |
| September 24 | 89.4°F (2017) | 34.2°F (2012) | 1.33 in (2016) |
| September 25 | 85.6°F (2017) | 37.4°F (2011) | 1.06 in (2009) |
| September 26 | 88.3°F (2021) | 41.7°F (2010) | 0.51 in (2009) |
| September 27 | 89.4°F (2021) | 36.7°F (2012) | 0.21 in (2020) |
| September 28 | 87.4°F (2021) | 33.6°F (2022) | 0.45 in (2005) |
| September 29 | 91.6°F (2023) | 34.0°F (2005) | 1.12 in (2008) |
| September 30 | 92.7°F (2023) | 36.1°F (2009) | 0.43 in (2021) |