September weather in Williamsport, MD
The average temperature in Williamsport in September is °F (°F–°F). Average precipitation: 4.13 inches.
September is a fall month in Williamsport, and is cooler than the annual average of 0°F. Daylight averages about 12h 15m.
Avg High
°F
Avg Low
°F
Precipitation
4.13 in
Daylight
12h 15m
September records in Williamsport
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2012) | 48.0°F (2009) | 3.87 in (1952) |
| September 2 | 98.1°F (2010) | 48.0°F (2009) | 5.75 in (2021) |
| September 3 | 99.0°F (2010) | 48.0°F (2009) | 2.37 in (1950) |
| September 4 | 97.0°F (2010) | 55.9°F (2008) | 0.82 in (1974) |
| September 5 | 89.1°F (2008) | 51.1°F (2010) | 0.93 in (1939) |
| September 6 | 90.0°F (1971) | 48.9°F (2010) | 1.40 in (2011) |
| September 7 | 90.0°F (2007) | 48.0°F (2010) | 2.06 in (2011) |
| September 8 | 93.9°F (2010) | 48.0°F (2013) | 0.87 in (1961) |
| September 9 | 95.0°F (2010) | 51.1°F (2005) | 1.71 in (2018) |
| September 10 | 91.9°F (1971) | 53.1°F (2010) | 2.73 in (2018) |
| September 11 | 91.9°F (2013) | 48.0°F (2010) | 0.79 in (1960) |
| September 12 | 91.0°F (2013) | 46.0°F (2010) | 2.37 in (1971) |
| September 13 | 90.0°F (2005) | 48.9°F (2012) | 1.12 in (1950) |
| September 14 | 91.9°F (2005) | 51.1°F (2007) | 1.85 in (1966) |
| September 15 | 90.0°F (2008) | 46.9°F (2013) | 3.17 in (1966) |
| September 16 | 91.9°F (2005) | 43.0°F (2007) | 1.01 in (1954) |
| September 17 | 84.9°F (2005) | 41.0°F (2007) | 0.70 in (2010) |
| September 18 | 89.1°F (2005) | 39.9°F (2007) | 3.30 in (1945) |
| September 19 | 84.9°F (2005) | 42.1°F (2013) | 1.64 in (2012) |
| September 20 | 87.1°F (2006) | 41.0°F (2008) | 0.95 in (1964) |
| September 21 | 86.0°F (2010) | 45.0°F (2006) | 2.70 in (1946) |
| September 22 | 87.1°F (2005) | 44.1°F (2006) | 1.08 in (1950) |
| September 23 | 96.1°F (2010) | 46.0°F (2006) | 2.26 in (1975) |
| September 24 | 95.0°F (2010) | 39.0°F (2012) | 1.50 in (2023) |
| September 25 | 96.1°F (2010) | 39.9°F (2012) | 2.48 in (1975) |
| September 26 | 91.0°F (2007) | 41.0°F (2012) | 1.44 in (1975) |
| September 27 | 91.9°F (2007) | 46.9°F (2006) | 1.54 in (2007) |
| September 28 | 86.0°F (2007) | 46.0°F (2005) | 1.41 in (2018) |
| September 29 | 86.0°F (2007) | 44.1°F (2005) | 1.63 in (1967) |
| September 30 | 78.1°F (1971) | 41.0°F (2005) | 1.53 in (2020) |