September weather in Duquesne, PA
The average temperature in Duquesne in September is 66.3°F (56.1°F–76.5°F). Average precipitation: 3.32 inches.
September is a fall month in Duquesne, and is warmer than the annual average of 52.4°F. Daily temperatures swing about 20.4°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
76.5°F
Avg Low
56.1°F
Precipitation
3.32 in
Daylight
12h 15m
September records in Duquesne
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 89.1°F (2012) | 48.0°F (2025) | 1.94 in (2021) |
| September 2 | 88.0°F (2020) | 51.1°F (2025) | 2.11 in (1962) |
| September 3 | 90.0°F (2011) | 48.9°F (2024) | 1.03 in (1993) |
| September 4 | 93.9°F (2011) | 48.9°F (2024) | 1.23 in (1981) |
| September 5 | 93.0°F (2018) | 55.9°F (2016) | 0.96 in (1991) |
| September 6 | 91.9°F (1978) | 55.9°F (2016) | 1.05 in (1968) |
| September 7 | 91.9°F (2023) | 53.1°F (2017) | 1.83 in (1990) |
| September 8 | 91.0°F (2023) | 50.0°F (2024) | 2.28 in (1998) |
| September 9 | 89.1°F (2015) | 46.0°F (2024) | 2.83 in (2004) |
| September 10 | 88.0°F (2015) | 46.0°F (2024) | 3.40 in (2018) |
| September 11 | 93.0°F (2016) | 48.0°F (2025) | 1.50 in (1960) |
| September 12 | 91.0°F (2019) | 48.9°F (2017) | 0.59 in (2007) |
| September 13 | 88.0°F (2019) | 48.9°F (2025) | 1.80 in (1978) |
| September 14 | 90.0°F (2019) | 48.9°F (2014) | 1.81 in (1972) |
| September 15 | 91.0°F (2018) | 48.9°F (2023) | 1.25 in (1945) |
| September 16 | 86.0°F (2024) | 45.0°F (2011) | 0.76 in (2003) |
| September 17 | 89.1°F (2018) | 48.0°F (2023) | 1.80 in (1989) |
| September 18 | 86.0°F (1978) | 48.0°F (2013) | 7.35 in (2004) |
| September 19 | 89.1°F (2017) | 42.1°F (2020) | 1.04 in (2012) |
| September 20 | 93.0°F (1978) | 41.0°F (2020) | 1.51 in (1953) |
| September 21 | 89.1°F (1978) | 41.0°F (2020) | 1.80 in (1957) |
| September 22 | 88.0°F (2017) | 42.1°F (2020) | 1.23 in (1982) |
| September 23 | 91.0°F (2017) | 42.1°F (2020) | 1.15 in (1989) |
| September 24 | 91.9°F (2017) | 45.0°F (2013) | 1.75 in (1975) |
| September 25 | 93.9°F (2017) | 41.0°F (2022) | 0.83 in (2001) |
| September 26 | 95.0°F (2017) | 46.0°F (2012) | 1.10 in (1945) |
| September 27 | 84.9°F (2017) | 48.9°F (2022) | 1.90 in (2002) |
| September 28 | 91.0°F (2017) | 43.0°F (2022) | 1.64 in (1962) |
| September 29 | 86.0°F (2019) | 43.0°F (2022) | 1.57 in (1979) |
| September 30 | 80.1°F (2025) | 42.1°F (2022) | 3.74 in (2015) |