September weather in Blue Mounds, WI
The average temperature in Blue Mounds in September is °F (°F–°F). Average precipitation: 3.78 inches.
September is a fall month in Blue Mounds, and is cooler than the annual average of 0°F. Expect about 11 days with precipitation. Daylight averages about 12h 17m.
Avg High
°F
Avg Low
°F
Precipitation
3.78 in
Daylight
12h 17m
September records in Blue Mounds
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 81.0°F (2024) | 46.9°F (2025) | 0.88 in (2010) |
| September 2 | 75.0°F (2025) | 45.0°F (2024) | 0.70 in (2018) |
| September 3 | 75.9°F (2025) | 45.0°F (2024) | 1.29 in (2011) |
| September 4 | 75.9°F (2024) | 37.9°F (2025) | 2.97 in (2014) |
| September 5 | 78.1°F (2024) | 41.0°F (2025) | 0.93 in (2008) |
| September 6 | 75.0°F (2024) | 39.9°F (2025) | 0.95 in (2018) |
| September 7 | 66.9°F (2024) | 37.9°F (2025) | 0.55 in (2016) |
| September 8 | 64.9°F (2024) | 37.0°F (2025) | 0.45 in (2016) |
| September 9 | 73.0°F (2024) | 39.0°F (2025) | 0.89 in (2020) |
| September 10 | 78.1°F (2024) | 43.0°F (2024) | 1.91 in (2019) |
| September 11 | 81.0°F (2024) | 44.1°F (2024) | 1.15 in (2022) |
| September 12 | 82.9°F (2024) | 50.0°F (2024) | 1.53 in (2022) |
| September 13 | 86.0°F (2024) | 51.1°F (2024) | 1.80 in (2021) |
| September 14 | 84.0°F (2024) | 57.9°F (2024) | 0.30 in (2008) |
| September 15 | 86.0°F (2024) | 57.0°F (2025) | 0.41 in (2013) |
| September 16 | 88.0°F (2024) | 55.0°F (2024) | 0.27 in (2013) |
| September 17 | 86.0°F (2024) | 51.1°F (2024) | 0.17 in (2023) |
| September 18 | 86.0°F (2024) | 48.0°F (2024) | 2.14 in (2015) |
| September 19 | 84.0°F (2024) | 48.9°F (2024) | 0.74 in (2013) |
| September 20 | 84.0°F (2024) | 52.0°F (2024) | 1.17 in (2018) |
| September 21 | 82.9°F (2024) | 53.1°F (2024) | 1.00 in (2021) |
| September 22 | 88.0°F (2024) | 53.1°F (2024) | 3.75 in (2024) |
| September 23 | 78.1°F (2025) | 46.0°F (2024) | 1.58 in (2009) |
| September 24 | 73.0°F (2025) | 48.9°F (2024) | 0.34 in (2010) |
| September 25 | 70.0°F (2024) | 45.0°F (2025) | 0.67 in (2022) |
| September 26 | 75.9°F (2025) | 46.0°F (2025) | 1.70 in (2023) |
| September 27 | 82.0°F (2025) | 50.0°F (2024) | 0.62 in (2011) |
| September 28 | 82.9°F (2025) | 48.0°F (2025) | 0.37 in (2020) |
| September 29 | 81.0°F (2025) | 48.9°F (2025) | 1.38 in (2015) |
| September 30 | 86.0°F (2025) | 48.9°F (2025) | 0.29 in (2018) |