September weather in Mandan, ND
The average temperature in Mandan in September is 59.0°F (45.8°F–72.1°F). Average precipitation: 1.64 inches.
September is a fall month in Mandan, and is warmer than the annual average of 42.4°F. Daily temperatures swing about 26.3°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
72.1°F
Avg Low
45.8°F
Precipitation
1.64 in
Daylight
12h 19m
September records in Mandan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (1929) | 33.1°F (1974) | 0.99 in (2002) |
| September 2 | 100.0°F (1983) | 33.1°F (1946) | 0.49 in (1986) |
| September 3 | 100.9°F (1971) | 30.0°F (1974) | 1.02 in (1968) |
| September 4 | 100.0°F (1931) | 35.1°F (1962) | 0.91 in (2018) |
| September 5 | 102.0°F (1913) | 28.9°F (1965) | 1.90 in (2023) |
| September 6 | 102.9°F (1978) | 30.9°F (1956) | 1.00 in (1938) |
| September 7 | 104.0°F (1931) | 34.0°F (1929) | 2.83 in (2010) |
| September 8 | 96.1°F (1931) | 28.9°F (2020) | 1.48 in (1991) |
| September 9 | 104.0°F (1959) | 25.0°F (2020) | 1.38 in (2019) |
| September 10 | 98.1°F (1994) | 28.0°F (1943) | 1.28 in (1947) |
| September 11 | 100.9°F (1952) | 24.1°F (1964) | 1.40 in (2009) |
| September 12 | 96.1°F (1948) | 27.0°F (1989) | 1.35 in (1930) |
| September 13 | 93.0°F (1927) | 25.0°F (1970) | 1.23 in (2019) |
| September 14 | 93.9°F (2015) | 25.0°F (1949) | 1.35 in (1954) |
| September 15 | 98.1°F (1935) | 23.0°F (1916) | 0.98 in (2013) |
| September 16 | 102.9°F (1948) | 28.0°F (1973) | 1.96 in (1994) |
| September 17 | 95.0°F (1979) | 28.0°F (1993) | 0.48 in (1986) |
| September 18 | 97.0°F (1933) | 25.0°F (1929) | 3.00 in (1977) |
| September 19 | 93.9°F (1941) | 23.0°F (1991) | 1.16 in (1967) |
| September 20 | 93.0°F (1972) | 21.9°F (1918) | 1.55 in (1996) |
| September 21 | 93.9°F (1960) | 25.0°F (1934) | 1.63 in (1955) |
| September 22 | 93.9°F (1936) | 19.0°F (1995) | 0.59 in (2000) |
| September 23 | 90.0°F (1917) | 21.9°F (1989) | 1.51 in (2019) |
| September 24 | 93.0°F (1958) | 24.1°F (1985) | 0.83 in (1920) |
| September 25 | 91.0°F (1938) | 16.0°F (1926) | 1.06 in (2017) |
| September 26 | 90.0°F (2014) | 16.0°F (1942) | 0.62 in (1959) |
| September 27 | 95.0°F (1963) | 18.0°F (1942) | 0.46 in (1944) |
| September 28 | 96.1°F (1952) | 19.9°F (1951) | 0.21 in (1971) |
| September 29 | 88.0°F (1931) | 21.9°F (1945) | 0.95 in (1923) |
| September 30 | 96.1°F (2024) | 14.0°F (1974) | 0.73 in (2019) |