September weather in Lancaster, PA
The average temperature in Lancaster in September is 66.9°F (55.6°F–78.2°F). Average precipitation: 4.82 inches.
September is a fall month in Lancaster, and is warmer than the annual average of 53.7°F. Daily temperatures swing about 22.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
78.2°F
Avg Low
55.6°F
Precipitation
4.82 in
Daylight
12h 15m
September records in Lancaster
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (1980) | 46.0°F (1986) | 5.30 in (2021) |
| September 2 | 99.0°F (1980) | 46.0°F (1991) | 1.27 in (2006) |
| September 3 | 97.0°F (1980) | 48.0°F (1994) | 1.81 in (1993) |
| September 4 | 98.1°F (2023) | 48.0°F (1987) | 2.00 in (2012) |
| September 5 | 95.0°F (2023) | 45.0°F (1997) | 1.79 in (2011) |
| September 6 | 96.1°F (2023) | 44.1°F (2000) | 3.54 in (1979) |
| September 7 | 97.0°F (2023) | 39.9°F (1984) | 1.96 in (2011) |
| September 8 | 93.0°F (2015) | 43.0°F (1984) | 5.68 in (1987) |
| September 9 | 93.0°F (2015) | 37.0°F (1986) | 2.08 in (2018) |
| September 10 | 95.0°F (1983) | 41.0°F (1986) | 2.17 in (2015) |
| September 11 | 96.1°F (1983) | 41.0°F (1995) | 2.79 in (2009) |
| September 12 | 95.0°F (1983) | 39.9°F (2014) | 2.16 in (2015) |
| September 13 | 91.9°F (2005) | 41.0°F (2019) | 1.41 in (2000) |
| September 14 | 91.0°F (2008) | 36.0°F (1985) | 2.50 in (1951) |
| September 15 | 91.9°F (2021) | 36.0°F (1985) | 1.10 in (1993) |
| September 16 | 93.0°F (1991) | 39.0°F (1985) | 6.11 in (1999) |
| September 17 | 91.0°F (1991) | 35.1°F (1986) | 1.60 in (1995) |
| September 18 | 88.0°F (1978) | 34.0°F (1986) | 1.95 in (2012) |
| September 19 | 91.9°F (1983) | 39.9°F (2020) | 1.75 in (1989) |
| September 20 | 91.9°F (1983) | 37.0°F (2020) | 1.27 in (1977) |
| September 21 | 87.1°F (1980) | 37.0°F (2020) | 0.90 in (1979) |
| September 22 | 96.1°F (1980) | 37.0°F (2020) | 2.81 in (1979) |
| September 23 | 96.1°F (1980) | 37.0°F (1983) | 3.60 in (2025) |
| September 24 | 91.0°F (2017) | 36.0°F (1983) | 1.44 in (2001) |
| September 25 | 91.0°F (2017) | 34.0°F (1983) | 2.36 in (1991) |
| September 26 | 91.0°F (2007) | 37.9°F (1983) | 2.30 in (1994) |
| September 27 | 90.0°F (1998) | 36.0°F (1978) | 4.96 in (1985) |
| September 28 | 82.9°F (1987) | 36.0°F (1989) | 2.73 in (2006) |
| September 29 | 84.0°F (2019) | 36.0°F (2000) | 1.68 in (2015) |
| September 30 | 89.1°F (1986) | 37.0°F (2000) | 1.18 in (1999) |