September weather in Lebanon, PA
The average temperature in Lebanon in September is 65.5°F (55.4°F–75.6°F). Average precipitation: 4.63 inches.
September is a fall month in Lebanon, and is warmer than the annual average of 52.3°F. Daily temperatures swing about 20.2°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
75.6°F
Avg Low
55.4°F
Precipitation
4.63 in
Daylight
12h 15m
September records in Lebanon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (1966) | 45.0°F (2009) | 5.55 in (2021) |
| September 2 | 93.9°F (2010) | 45.0°F (1970) | 6.79 in (1951) |
| September 3 | 93.9°F (1966) | 42.1°F (1967) | 1.12 in (1969) |
| September 4 | 93.0°F (2023) | 46.0°F (1994) | 1.50 in (1988) |
| September 5 | 91.0°F (1983) | 41.0°F (1974) | 1.93 in (2011) |
| September 6 | 95.0°F (1983) | 42.1°F (1988) | 3.80 in (1979) |
| September 7 | 97.0°F (1983) | 39.9°F (1984) | 5.70 in (2011) |
| September 8 | 91.9°F (2015) | 43.0°F (1988) | 2.46 in (2011) |
| September 9 | 91.9°F (2002) | 39.9°F (1986) | 2.03 in (2018) |
| September 10 | 96.1°F (1983) | 42.1°F (1979) | 2.50 in (2015) |
| September 11 | 98.1°F (1983) | 37.0°F (1973) | 3.11 in (1968) |
| September 12 | 97.0°F (1983) | 37.9°F (1967) | 1.40 in (1987) |
| September 13 | 90.0°F (2005) | 39.9°F (1973) | 1.30 in (1987) |
| September 14 | 89.1°F (2008) | 37.9°F (1985) | 1.90 in (1973) |
| September 15 | 88.0°F (1969) | 39.0°F (2001) | 2.00 in (1973) |
| September 16 | 91.9°F (1991) | 37.9°F (1985) | 4.40 in (1999) |
| September 17 | 93.9°F (1970) | 37.9°F (1984) | 1.38 in (1987) |
| September 18 | 90.0°F (1969) | 35.1°F (1986) | 5.16 in (2004) |
| September 19 | 93.9°F (1983) | 39.0°F (1973) | 1.56 in (1989) |
| September 20 | 91.9°F (1983) | 34.0°F (1979) | 0.30 in (1982) |
| September 21 | 86.0°F (1980) | 36.0°F (2020) | 1.30 in (1979) |
| September 22 | 95.0°F (1983) | 36.0°F (1991) | 1.50 in (1979) |
| September 23 | 93.9°F (1970) | 35.1°F (1974) | 2.88 in (2021) |
| September 24 | 93.9°F (1970) | 30.0°F (1974) | 1.93 in (1975) |
| September 25 | 93.9°F (1970) | 30.9°F (1974) | 2.00 in (1975) |
| September 26 | 93.0°F (1970) | 39.0°F (1966) | 3.96 in (1975) |
| September 27 | 91.0°F (1970) | 37.9°F (1984) | 4.11 in (1985) |
| September 28 | 84.0°F (2019) | 34.0°F (1989) | 2.91 in (2004) |
| September 29 | 80.1°F (1983) | 33.1°F (2000) | 1.04 in (2016) |
| September 30 | 88.0°F (1986) | 35.1°F (1992) | 5.11 in (2010) |