September weather in Duncan, AZ
The average temperature in Duncan in September is 73.5°F (56.4°F–90.7°F). Average precipitation: 1.21 inches.
September is a fall month in Duncan, and is warmer than the annual average of 61.4°F. Daily temperatures swing about 34.3°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 11m. For travel, September is hot.
Avg High
90.7°F
Avg Low
56.4°F
Precipitation
1.21 in
Daylight
12h 11m
September records in Duncan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (1905) | 48.9°F (1906) | 0.49 in (1978) |
| September 2 | 102.9°F (1904) | 46.0°F (1906) | 0.63 in (2008) |
| September 3 | 102.9°F (2020) | 46.9°F (1953) | 1.00 in (1901) |
| September 4 | 104.0°F (2020) | 39.9°F (1961) | 0.65 in (1970) |
| September 5 | 102.0°F (1979) | 44.1°F (1992) | 1.06 in (1975) |
| September 6 | 104.0°F (2023) | 43.0°F (1988) | 0.37 in (2018) |
| September 7 | 105.1°F (2020) | 44.1°F (1984) | 1.09 in (2016) |
| September 8 | 105.1°F (2023) | 43.0°F (1952) | 0.87 in (2013) |
| September 9 | 105.1°F (2023) | 43.0°F (1952) | 0.90 in (1991) |
| September 10 | 104.0°F (2023) | 43.0°F (1987) | 1.90 in (1901) |
| September 11 | 100.0°F (1904) | 41.0°F (1956) | 0.51 in (1975) |
| September 12 | 100.9°F (2004) | 41.0°F (1973) | 1.01 in (1942) |
| September 13 | 102.9°F (2000) | 39.9°F (1950) | 1.10 in (2023) |
| September 14 | 100.9°F (2000) | 39.0°F (1950) | 0.77 in (1964) |
| September 15 | 100.0°F (1905) | 35.1°F (1950) | 0.96 in (1949) |
| September 16 | 100.0°F (2003) | 37.0°F (1903) | 1.38 in (2014) |
| September 17 | 100.9°F (2018) | 39.0°F (1903) | 0.58 in (1947) |
| September 18 | 100.9°F (2018) | 41.0°F (1903) | 1.07 in (1970) |
| September 19 | 97.0°F (1998) | 37.0°F (1988) | 1.90 in (2018) |
| September 20 | 100.0°F (2005) | 37.0°F (1993) | 0.61 in (2018) |
| September 21 | 99.0°F (2001) | 39.0°F (1965) | 1.78 in (1997) |
| September 22 | 98.1°F (1993) | 39.0°F (1902) | 1.05 in (1990) |
| September 23 | 99.0°F (2005) | 37.9°F (1975) | 1.50 in (1943) |
| September 24 | 99.0°F (1998) | 37.0°F (1968) | 0.97 in (1967) |
| September 25 | 99.0°F (1901) | 37.0°F (1975) | 0.94 in (1967) |
| September 26 | 100.9°F (2005) | 37.0°F (1975) | 1.13 in (1962) |
| September 27 | 102.0°F (2024) | 37.0°F (1973) | 1.45 in (1903) |
| September 28 | 102.0°F (2024) | 35.1°F (1901) | 0.97 in (1985) |
| September 29 | 100.0°F (2003) | 36.0°F (1982) | 1.23 in (1941) |
| September 30 | 100.9°F (2024) | 34.0°F (1905) | 0.60 in (1990) |