September weather in Sioux Falls, SD
The average temperature in Sioux Falls in September is 63.3°F (51.7°F–74.8°F). Average precipitation: 3.04 inches.
September is a fall month in Sioux Falls, and is warmer than the annual average of 46.6°F. Daily temperatures swing about 23.1°F between overnight low and afternoon high. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
74.8°F
Avg Low
51.7°F
Precipitation
3.04 in
Daylight
12h 17m
September records in Sioux Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2022) | 55.0°F (2016) | 0.59 in (2013) |
| September 2 | 100.9°F (2023) | 55.0°F (2014) | 0.38 in (2021) |
| September 3 | 97.0°F (2023) | 48.9°F (2025) | 0.42 in (2012) |
| September 4 | 99.0°F (2023) | 46.0°F (2025) | 0.72 in (2016) |
| September 5 | 88.0°F (2015) | 43.0°F (2011) | 1.15 in (2016) |
| September 6 | 90.0°F (2021) | 41.0°F (2025) | 0.10 in (2016) |
| September 7 | 89.1°F (2022) | 37.9°F (2025) | 0.47 in (2016) |
| September 8 | 93.9°F (2022) | 43.0°F (2020) | 0.52 in (2015) |
| September 9 | 84.9°F (2024) | 41.0°F (2020) | 0.93 in (2014) |
| September 10 | 89.1°F (2012) | 41.0°F (2020) | 1.67 in (2019) |
| September 11 | 97.0°F (2012) | 44.1°F (2015) | 0.82 in (2019) |
| September 12 | 89.1°F (2025) | 41.0°F (2014) | 1.15 in (2019) |
| September 13 | 91.0°F (2025) | 39.9°F (2014) | 0.17 in (2021) |
| September 14 | 91.0°F (2022) | 37.9°F (2011) | 0.14 in (2023) |
| September 15 | 91.9°F (2018) | 32.0°F (2011) | 3.57 in (2016) |
| September 16 | 93.0°F (2021) | 41.0°F (2014) | 0.23 in (2021) |
| September 17 | 88.0°F (2019) | 41.0°F (2017) | 0.05 in (2022) |
| September 18 | 86.0°F (2023) | 36.0°F (2012) | 0.67 in (2018) |
| September 19 | 88.0°F (2021) | 41.0°F (2015) | 2.50 in (2018) |
| September 20 | 93.9°F (2022) | 45.0°F (2012) | 3.30 in (2018) |
| September 21 | 90.0°F (2016) | 41.0°F (2011) | 0.16 in (2023) |
| September 22 | 93.0°F (2017) | 33.1°F (2012) | 0.13 in (2016) |
| September 23 | 88.0°F (2016) | 30.0°F (2012) | 0.65 in (2016) |
| September 24 | 82.9°F (2017) | 39.9°F (2011) | 1.59 in (2015) |
| September 25 | 84.9°F (2025) | 39.0°F (2011) | 0.68 in (2017) |
| September 26 | 91.0°F (2021) | 36.0°F (2012) | 0.19 in (2017) |
| September 27 | 88.0°F (2024) | 34.0°F (2012) | 0.06 in (2013) |
| September 28 | 90.0°F (2024) | 37.0°F (2022) | 0.35 in (2013) |
| September 29 | 91.9°F (2025) | 36.0°F (2018) | 0.13 in (2021) |
| September 30 | 91.9°F (2023) | 37.9°F (2011) | 0.83 in (2021) |