September weather in Brown Deer, WI
The average temperature in Brown Deer in September is °F (°F–°F). Average precipitation: 3.09 inches.
September is a fall month in Brown Deer, and is cooler than the annual average of 0°F. Daylight averages about 12h 17m.
Avg High
°F
Avg Low
°F
Precipitation
3.09 in
Daylight
12h 17m
September records in Brown Deer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2010) | 48.0°F (2019) | 0.53 in (2010) |
| September 2 | 88.0°F (2010) | 45.0°F (2017) | 0.56 in (2018) |
| September 3 | 90.0°F (2011) | 45.0°F (2017) | 0.71 in (2018) |
| September 4 | 84.0°F (2012) | 51.1°F (2013) | 0.72 in (2012) |
| September 5 | 90.0°F (2018) | 46.9°F (2011) | 0.35 in (2012) |
| September 6 | 88.0°F (2015) | 45.0°F (2017) | 1.83 in (2018) |
| September 7 | 93.0°F (2016) | 45.0°F (2017) | 0.34 in (2010) |
| September 8 | 82.9°F (2013) | 48.0°F (2011) | 0.43 in (2013) |
| September 9 | 86.0°F (2013) | 45.0°F (2017) | 0.97 in (2015) |
| September 10 | 86.0°F (2013) | 44.1°F (2017) | 0.38 in (2019) |
| September 11 | 95.0°F (2013) | 44.1°F (2017) | 0.51 in (2010) |
| September 12 | 88.0°F (2013) | 43.0°F (2014) | 1.48 in (2019) |
| September 13 | 84.9°F (2011) | 37.0°F (2014) | 1.84 in (2019) |
| September 14 | 79.0°F (2010) | 37.0°F (2014) | 0.04 in (2016) |
| September 15 | 82.0°F (2018) | 36.0°F (2011) | 0.35 in (2013) |
| September 16 | 86.0°F (2017) | 36.0°F (2011) | 0.37 in (2013) |
| September 17 | 88.0°F (2017) | 41.0°F (2013) | 0.13 in (2016) |
| September 18 | 88.0°F (2018) | 41.0°F (2013) | 1.15 in (2015) |
| September 19 | 79.0°F (2013) | 37.9°F (2012) | 0.64 in (2011) |
| September 20 | 84.0°F (2016) | 34.0°F (2012) | 0.90 in (2013) |
| September 21 | 88.0°F (2017) | 45.0°F (2012) | 0.41 in (2016) |
| September 22 | 88.0°F (2010) | 37.0°F (2014) | 0.33 in (2016) |
| September 23 | 93.0°F (2017) | 36.0°F (2012) | 0.24 in (2019) |
| September 24 | 91.0°F (2010) | 36.0°F (2012) | 0.00 in (2010) |
| September 25 | 91.0°F (2017) | 35.1°F (2012) | 0.19 in (2011) |
| September 26 | 91.0°F (2017) | 35.1°F (2012) | 1.70 in (2011) |
| September 27 | 88.0°F (2017) | 35.1°F (2012) | 2.00 in (2011) |
| September 28 | 75.9°F (2013) | 43.0°F (2012) | 0.82 in (2011) |
| September 29 | 81.0°F (2013) | 36.0°F (2018) | 0.70 in (2019) |
| September 30 | 81.0°F (2014) | 36.0°F (2018) | 0.50 in (2019) |