September weather in Prairie du Sac, WI
The average temperature in Prairie du Sac in September is 61.2°F (48.9°F–73.5°F). Average precipitation: 3.94 inches.
September is a fall month in Prairie du Sac, and is warmer than the annual average of 45.9°F. Daily temperatures swing about 24.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
73.5°F
Avg Low
48.9°F
Precipitation
3.94 in
Daylight
12h 17m
September records in Prairie du Sac
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (2012) | 42.1°F (2009) | 2.01 in (2010) |
| September 2 | 93.0°F (2011) | 43.0°F (2009) | 0.87 in (2020) |
| September 3 | 89.1°F (2023) | 42.1°F (2009) | 0.84 in (2011) |
| September 4 | 93.0°F (2023) | 41.0°F (2025) | 2.02 in (2014) |
| September 5 | 93.0°F (2023) | 42.1°F (2025) | 0.42 in (2012) |
| September 6 | 86.0°F (2016) | 39.9°F (2011) | 0.55 in (2018) |
| September 7 | 90.0°F (2015) | 39.0°F (2024) | 1.07 in (2016) |
| September 8 | 90.0°F (2013) | 39.0°F (2024) | 1.12 in (2016) |
| September 9 | 82.0°F (2022) | 39.9°F (2025) | 0.87 in (2020) |
| September 10 | 90.0°F (2013) | 42.1°F (2018) | 1.78 in (2019) |
| September 11 | 93.9°F (2013) | 39.9°F (2017) | 1.10 in (2022) |
| September 12 | 86.0°F (2012) | 41.0°F (2014) | 1.28 in (2022) |
| September 13 | 87.1°F (2012) | 33.1°F (2014) | 2.68 in (2019) |
| September 14 | 84.9°F (2024) | 37.0°F (2014) | 0.69 in (2021) |
| September 15 | 86.0°F (2018) | 33.1°F (2011) | 0.47 in (2013) |
| September 16 | 89.1°F (2024) | 33.1°F (2011) | 0.24 in (2014) |
| September 17 | 88.0°F (2025) | 36.0°F (2011) | 0.09 in (2017) |
| September 18 | 89.1°F (2018) | 37.9°F (2012) | 1.45 in (2015) |
| September 19 | 87.1°F (2025) | 28.9°F (2012) | 0.65 in (2011) |
| September 20 | 88.0°F (2021) | 39.0°F (2020) | 1.68 in (2013) |
| September 21 | 90.0°F (2017) | 37.0°F (2012) | 1.29 in (2021) |
| September 22 | 86.0°F (2017) | 37.0°F (2014) | 3.39 in (2024) |
| September 23 | 91.0°F (2017) | 37.9°F (2011) | 1.11 in (2009) |
| September 24 | 93.0°F (2017) | 28.9°F (2012) | 0.31 in (2010) |
| September 25 | 90.0°F (2017) | 28.0°F (2012) | 0.19 in (2022) |
| September 26 | 91.0°F (2017) | 36.0°F (2012) | 1.06 in (2011) |
| September 27 | 82.9°F (2025) | 30.9°F (2012) | 0.40 in (2011) |
| September 28 | 84.9°F (2025) | 30.9°F (2012) | 0.37 in (2020) |
| September 29 | 82.9°F (2014) | 32.0°F (2018) | 1.67 in (2015) |
| September 30 | 88.0°F (2025) | 33.1°F (2022) | 0.30 in (2011) |