September weather in Petersburg, MI
The average temperature in Petersburg in September is 64.0°F (52.7°F–75.2°F). Average precipitation: 2.86 inches.
September is a fall month in Petersburg, and is warmer than the annual average of 49.4°F. Daily temperatures swing about 22.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
75.2°F
Avg Low
52.7°F
Precipitation
2.86 in
Daylight
12h 16m
September records in Petersburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2010) | 46.9°F (2009) | 0.93 in (2003) |
| September 2 | 93.0°F (2010) | 46.9°F (2009) | 0.45 in (2018) |
| September 3 | 97.0°F (2011) | 46.9°F (2024) | 0.53 in (2015) |
| September 4 | 95.0°F (2008) | 48.0°F (2024) | 0.79 in (2004) |
| September 5 | 91.0°F (2018) | 48.0°F (2010) | 0.26 in (2021) |
| September 6 | 93.0°F (2014) | 46.0°F (2017) | 1.14 in (2006) |
| September 7 | 91.0°F (2002) | 43.0°F (2025) | 0.84 in (2004) |
| September 8 | 93.0°F (2002) | 41.0°F (2024) | 0.92 in (2023) |
| September 9 | 93.0°F (2002) | 41.0°F (2024) | 0.63 in (2001) |
| September 10 | 91.0°F (2002) | 43.0°F (2017) | 1.11 in (2016) |
| September 11 | 93.0°F (2013) | 44.1°F (2017) | 1.92 in (2014) |
| September 12 | 91.9°F (2013) | 46.9°F (2007) | 1.02 in (2019) |
| September 13 | 91.0°F (2005) | 42.1°F (2001) | 1.30 in (2006) |
| September 14 | 90.0°F (2005) | 39.9°F (2013) | 2.27 in (2008) |
| September 15 | 89.1°F (2021) | 41.0°F (2011) | 0.57 in (2008) |
| September 16 | 84.9°F (2018) | 37.9°F (2007) | 0.97 in (2005) |
| September 17 | 84.0°F (2002) | 39.9°F (2013) | 0.35 in (2010) |
| September 18 | 87.1°F (2021) | 39.9°F (2013) | 0.28 in (2016) |
| September 19 | 89.1°F (2018) | 36.0°F (2020) | 1.07 in (2001) |
| September 20 | 86.0°F (2007) | 36.0°F (2020) | 1.37 in (2002) |
| September 21 | 86.0°F (2024) | 41.0°F (2006) | 0.48 in (2014) |
| September 22 | 91.0°F (2010) | 39.9°F (2006) | 2.20 in (2021) |
| September 23 | 89.1°F (2024) | 41.0°F (2014) | 1.50 in (2021) |
| September 24 | 91.0°F (2010) | 36.0°F (2012) | 2.30 in (2025) |
| September 25 | 89.1°F (2007) | 36.0°F (2012) | 0.54 in (2018) |
| September 26 | 91.0°F (2017) | 43.0°F (2003) | 1.94 in (2018) |
| September 27 | 91.0°F (2017) | 43.0°F (2006) | 0.58 in (2002) |
| September 28 | 86.0°F (2025) | 43.0°F (2001) | 1.41 in (2023) |
| September 29 | 82.9°F (2025) | 37.0°F (2006) | 0.86 in (2016) |
| September 30 | 82.9°F (2002) | 37.0°F (2006) | 0.60 in (1994) |