September weather in Boonsboro, MD
The average temperature in Boonsboro in September is 65.9°F (53.7°F–78.1°F). Average precipitation: 4.40 inches.
September is a fall month in Boonsboro, and is warmer than the annual average of 52.9°F. Daily temperatures swing about 24.4°F between overnight low and afternoon high. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
78.1°F
Avg Low
53.7°F
Precipitation
4.40 in
Daylight
12h 15m
September records in Boonsboro
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2010) | 44.1°F (2009) | 0.61 in (2021) |
| September 2 | 98.1°F (2010) | 44.1°F (2009) | 2.67 in (2021) |
| September 3 | 98.1°F (2010) | 45.0°F (2009) | 1.34 in (2003) |
| September 4 | 96.1°F (2010) | 46.9°F (2009) | 0.36 in (2020) |
| September 5 | 91.9°F (2008) | 48.0°F (2010) | 0.73 in (1999) |
| September 6 | 91.9°F (2018) | 42.1°F (2000) | 1.17 in (2017) |
| September 7 | 97.0°F (1998) | 42.1°F (2000) | 2.71 in (2008) |
| September 8 | 93.9°F (2007) | 46.0°F (2013) | 0.86 in (1998) |
| September 9 | 93.9°F (2007) | 44.1°F (1998) | 1.79 in (2018) |
| September 10 | 93.0°F (2016) | 41.0°F (2017) | 1.89 in (2018) |
| September 11 | 93.9°F (2016) | 42.1°F (2017) | 0.32 in (2018) |
| September 12 | 93.9°F (2013) | 44.1°F (2010) | 0.71 in (2011) |
| September 13 | 93.9°F (1998) | 46.9°F (2002) | 0.57 in (2000) |
| September 14 | 91.0°F (1998) | 42.1°F (2013) | 1.26 in (2006) |
| September 15 | 93.9°F (1998) | 37.0°F (2001) | 0.44 in (2011) |
| September 16 | 93.9°F (1998) | 37.0°F (2001) | 1.73 in (1999) |
| September 17 | 93.0°F (1998) | 37.9°F (2007) | 1.00 in (1999) |
| September 18 | 89.1°F (2005) | 39.0°F (2007) | 3.79 in (2004) |
| September 19 | 87.1°F (1998) | 35.1°F (2020) | 2.86 in (2012) |
| September 20 | 87.1°F (2015) | 33.1°F (2020) | 2.11 in (2000) |
| September 21 | 89.1°F (1998) | 34.0°F (2020) | 0.37 in (2001) |
| September 22 | 90.0°F (1998) | 34.0°F (2020) | 0.54 in (2002) |
| September 23 | 96.1°F (2010) | 35.1°F (2020) | 2.74 in (2021) |
| September 24 | 93.9°F (2010) | 37.0°F (1998) | 0.77 in (2018) |
| September 25 | 95.0°F (2010) | 37.0°F (1998) | 1.35 in (2001) |
| September 26 | 93.0°F (2007) | 37.0°F (2001) | 1.30 in (2000) |
| September 27 | 93.0°F (2007) | 37.9°F (2001) | 1.79 in (2002) |
| September 28 | 95.0°F (1998) | 37.9°F (2000) | 1.80 in (2018) |
| September 29 | 88.0°F (2019) | 39.0°F (2000) | 3.63 in (2004) |
| September 30 | 84.9°F (2019) | 35.1°F (2001) | 2.49 in (1999) |