September weather in Duluth, MN
The average temperature in Duluth in September is 58.5°F (50.8°F–66.2°F). Average precipitation: inches.
September is a fall month in Duluth, and is warmer than the annual average of 40.8°F. Daily temperatures swing about 15.4°F between overnight low and afternoon high. Daylight averages about 12h 19m. For travel, September is one of the best months of the year to visit.
Avg High
66.2°F
Avg Low
50.8°F
Precipitation
in
Daylight
12h 19m
September records in Duluth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 86.0°F (1973) | 41.0°F (1999) | 1.50 in (1979) |
| September 2 | 88.0°F (1983) | 48.0°F (1974) | 2.10 in (1985) |
| September 3 | 87.1°F (1960) | 45.0°F (1974) | 2.35 in (1980) |
| September 4 | 84.9°F (1978) | 37.9°F (1974) | 0.80 in (1980) |
| September 5 | 86.0°F (1998) | 39.9°F (2003) | 0.73 in (1987) |
| September 6 | 89.1°F (1998) | 44.1°F (1986) | 3.53 in (1990) |
| September 7 | 91.9°F (1976) | 42.1°F (1976) | 4.35 in (1964) |
| September 8 | 88.0°F (2002) | 42.1°F (1976) | 1.40 in (1980) |
| September 9 | 88.0°F (2002) | 35.1°F (1975) | 0.85 in (1971) |
| September 10 | 84.9°F (2002) | 36.0°F (1977) | 2.03 in (1983) |
| September 11 | 86.0°F (1976) | 39.0°F (2004) | 0.79 in (1979) |
| September 12 | 87.1°F (1998) | 36.0°F (2004) | 1.16 in (1982) |
| September 13 | 81.0°F (1990) | 35.1°F (1977) | 0.55 in (1967) |
| September 14 | 81.0°F (1990) | 34.0°F (2002) | 1.22 in (1965) |
| September 15 | 80.1°F (1968) | 37.9°F (1964) | 2.00 in (1983) |
| September 16 | 75.9°F (1979) | 37.0°F (2003) | 1.10 in (1988) |
| September 17 | 81.0°F (1998) | 34.0°F (2004) | 1.51 in (1986) |
| September 18 | 84.0°F (1984) | 39.0°F (1982) | 1.70 in (1990) |
| September 19 | 84.0°F (1984) | 30.9°F (2003) | 1.95 in (1988) |
| September 20 | 75.9°F (1967) | 37.9°F (1976) | 3.51 in (1972) |
| September 21 | 78.1°F (2004) | 35.1°F (1976) | 0.49 in (1973) |
| September 22 | 70.0°F (1978) | 32.0°F (1976) | 0.52 in (1977) |
| September 23 | 79.0°F (1987) | 28.9°F (1974) | 1.25 in (1984) |
| September 24 | 70.0°F (1990) | 30.0°F (1976) | 1.54 in (1984) |
| September 25 | 80.1°F (1990) | 28.9°F (1976) | 0.86 in (1986) |
| September 26 | 79.0°F (1990) | 28.9°F (1965) | 1.33 in (1981) |
| September 27 | 73.9°F (2004) | 33.1°F (1976) | 0.50 in (1992) |
| September 28 | 77.0°F (1989) | 32.0°F (1961) | 0.41 in (1963) |
| September 29 | 80.1°F (2000) | 35.1°F (1984) | 1.00 in (1990) |
| September 30 | 79.0°F (1976) | 30.0°F (2003) | 2.10 in (1981) |