September weather in Delavan, WI
The average temperature in Delavan in September is 62.7°F (51.2°F–74.2°F). Average precipitation: 3.74 inches.
September is a fall month in Delavan, and is warmer than the annual average of 47.6°F. Daily temperatures swing about 23°F between overnight low and afternoon high. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
74.2°F
Avg Low
51.2°F
Precipitation
3.74 in
Daylight
12h 16m
September records in Delavan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2012) | 44.1°F (2025) | 0.07 in (2019) |
| September 2 | 91.9°F (2011) | 42.1°F (2017) | 1.01 in (2018) |
| September 3 | 89.1°F (2011) | 46.9°F (2013) | 1.18 in (2018) |
| September 4 | 95.0°F (2023) | 39.9°F (2025) | 1.30 in (2018) |
| September 5 | 91.9°F (2012) | 39.9°F (2025) | 0.94 in (2012) |
| September 6 | 91.9°F (2012) | 43.0°F (2011) | 0.94 in (2018) |
| September 7 | 91.9°F (2012) | 37.9°F (2025) | 0.29 in (2020) |
| September 8 | 89.1°F (2013) | 37.9°F (2025) | 1.40 in (2016) |
| September 9 | 82.9°F (2016) | 41.0°F (2024) | 1.12 in (2020) |
| September 10 | 90.0°F (2013) | 42.1°F (2017) | 2.20 in (2019) |
| September 11 | 93.9°F (2013) | 41.0°F (2017) | 1.53 in (2022) |
| September 12 | 86.0°F (2019) | 45.0°F (2014) | 3.55 in (2022) |
| September 13 | 87.1°F (2012) | 37.0°F (2014) | 2.50 in (2019) |
| September 14 | 84.9°F (2024) | 37.0°F (2014) | 0.21 in (2012) |
| September 15 | 86.0°F (2024) | 35.1°F (2011) | 0.28 in (2013) |
| September 16 | 87.1°F (2024) | 37.0°F (2014) | 0.56 in (2013) |
| September 17 | 88.0°F (2024) | 37.9°F (2014) | 1.07 in (2023) |
| September 18 | 89.1°F (2018) | 43.0°F (2012) | 3.00 in (2015) |
| September 19 | 84.9°F (2024) | 35.1°F (2012) | 0.90 in (2015) |
| September 20 | 89.1°F (2021) | 39.0°F (2020) | 1.21 in (2018) |
| September 21 | 90.0°F (2017) | 42.1°F (2012) | 0.61 in (2016) |
| September 22 | 91.9°F (2017) | 36.0°F (2014) | 0.63 in (2012) |
| September 23 | 93.0°F (2017) | 33.1°F (2012) | 1.49 in (2024) |
| September 24 | 93.0°F (2017) | 33.1°F (2012) | 0.55 in (2022) |
| September 25 | 90.0°F (2017) | 34.0°F (2012) | 0.33 in (2011) |
| September 26 | 91.9°F (2017) | 41.0°F (2022) | 1.80 in (2023) |
| September 27 | 88.0°F (2017) | 36.0°F (2012) | 0.70 in (2011) |
| September 28 | 87.1°F (2021) | 39.0°F (2012) | 0.40 in (2020) |
| September 29 | 84.9°F (2025) | 36.0°F (2022) | 0.98 in (2019) |
| September 30 | 88.0°F (2025) | 32.0°F (2018) | 0.53 in (2018) |