September weather in Flat Rock, MI
The average temperature in Flat Rock in September is 63.8°F (52.7°F–74.9°F). Average precipitation: 3.38 inches.
September is a fall month in Flat Rock, and is warmer than the annual average of 49.5°F. Daily temperatures swing about 22.2°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
74.9°F
Avg Low
52.7°F
Precipitation
3.38 in
Daylight
12h 16m
September records in Flat Rock
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.0°F (2010) | 44.1°F (2009) | 0.47 in (2014) |
| September 2 | 91.9°F (2011) | 46.0°F (2009) | 0.84 in (2010) |
| September 3 | 91.9°F (2011) | 48.0°F (2009) | 0.88 in (2015) |
| September 4 | 93.0°F (2008) | 50.0°F (2009) | 0.84 in (2008) |
| September 5 | 91.0°F (2014) | 44.1°F (2010) | 0.78 in (2014) |
| September 6 | 89.1°F (2016) | 46.0°F (2013) | 1.25 in (2020) |
| September 7 | 91.0°F (2016) | 52.0°F (2013) | 0.68 in (2011) |
| September 8 | 87.1°F (2015) | 51.1°F (2014) | 0.69 in (2011) |
| September 9 | 82.9°F (2016) | 46.0°F (2012) | 1.03 in (2011) |
| September 10 | 93.0°F (2013) | 43.0°F (2010) | 2.62 in (2014) |
| September 11 | 91.9°F (2013) | 41.0°F (2008) | 1.78 in (2019) |
| September 12 | 88.0°F (2019) | 46.0°F (2008) | 0.40 in (2020) |
| September 13 | 90.0°F (2019) | 39.9°F (2015) | 0.98 in (2019) |
| September 14 | 82.9°F (2018) | 39.0°F (2013) | 3.36 in (2008) |
| September 15 | 84.9°F (2018) | 41.0°F (2011) | 0.61 in (2008) |
| September 16 | 84.0°F (2018) | 39.0°F (2011) | 1.26 in (2010) |
| September 17 | 84.0°F (2018) | 39.9°F (2013) | 0.37 in (2016) |
| September 18 | 89.1°F (2018) | 36.0°F (2020) | 0.11 in (2015) |
| September 19 | 84.0°F (2016) | 34.0°F (2012) | 0.76 in (2011) |
| September 20 | 84.0°F (2019) | 39.9°F (2012) | 0.74 in (2013) |
| September 21 | 90.0°F (2010) | 42.1°F (2020) | 0.36 in (2009) |
| September 22 | 90.0°F (2010) | 44.1°F (2014) | 0.21 in (2010) |
| September 23 | 90.0°F (2010) | 41.0°F (2012) | 0.64 in (2011) |
| September 24 | 86.0°F (2010) | 33.1°F (2012) | 0.01 in (2011) |
| September 25 | 80.1°F (2020) | 44.1°F (2018) | 0.02 in (2011) |
| September 26 | 82.9°F (2020) | 45.0°F (2010) | 1.43 in (2011) |
| September 27 | 82.0°F (2020) | 39.0°F (2018) | 0.84 in (2019) |
| September 28 | 78.1°F (2014) | 45.0°F (2012) | 0.72 in (2010) |
| September 29 | 79.0°F (2014) | 39.9°F (2012) | 1.38 in (2016) |
| September 30 | 80.1°F (2019) | 35.1°F (2009) | 0.32 in (2014) |