September weather in Cornell, WI
The average temperature in Cornell in September is 58.8°F (47.9°F–69.6°F). Average precipitation: 3.67 inches.
September is a fall month in Cornell, and is warmer than the annual average of 42.7°F. Daily temperatures swing about 21.7°F between overnight low and afternoon high. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
69.6°F
Avg Low
47.9°F
Precipitation
3.67 in
Daylight
12h 18m
September records in Cornell
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (1953) | 37.9°F (1949) | 2.64 in (1942) |
| September 2 | 93.0°F (1953) | 34.0°F (1946) | 2.78 in (1964) |
| September 3 | 91.0°F (1960) | 28.0°F (1946) | 1.44 in (1934) |
| September 4 | 91.9°F (2023) | 30.0°F (1946) | 2.48 in (1941) |
| September 5 | 91.9°F (2023) | 37.0°F (1950) | 1.89 in (2018) |
| September 6 | 91.9°F (1960) | 35.1°F (1988) | 4.68 in (1958) |
| September 7 | 95.0°F (1976) | 33.1°F (1956) | 1.45 in (1991) |
| September 8 | 93.9°F (1976) | 30.9°F (1944) | 2.39 in (1960) |
| September 9 | 90.0°F (1947) | 32.0°F (1944) | 4.09 in (1938) |
| September 10 | 90.0°F (1978) | 30.9°F (1967) | 2.26 in (1986) |
| September 11 | 88.0°F (1952) | 28.9°F (1955) | 2.86 in (1947) |
| September 12 | 89.1°F (1952) | 28.0°F (1955) | 1.65 in (1951) |
| September 13 | 89.1°F (1952) | 30.0°F (1963) | 1.64 in (1962) |
| September 14 | 89.1°F (1998) | 28.9°F (2007) | 1.38 in (1993) |
| September 15 | 86.0°F (1969) | 27.0°F (2007) | 1.85 in (2004) |
| September 16 | 90.0°F (1955) | 30.0°F (2014) | 1.60 in (1992) |
| September 17 | 89.1°F (1948) | 28.9°F (1943) | 1.22 in (1997) |
| September 18 | 90.0°F (1955) | 28.9°F (1943) | 4.29 in (1942) |
| September 19 | 88.0°F (1955) | 33.1°F (1992) | 2.10 in (1983) |
| September 20 | 84.9°F (1984) | 26.1°F (1956) | 2.00 in (1964) |
| September 21 | 84.0°F (1985) | 28.9°F (1943) | 2.10 in (1931) |
| September 22 | 84.0°F (1946) | 25.0°F (2012) | 2.10 in (2016) |
| September 23 | 89.1°F (2017) | 26.1°F (1974) | 3.14 in (1986) |
| September 24 | 86.0°F (2017) | 24.1°F (1950) | 2.73 in (2010) |
| September 25 | 86.0°F (2017) | 18.0°F (1947) | 1.98 in (2007) |
| September 26 | 80.1°F (1974) | 17.1°F (1947) | 2.63 in (1972) |
| September 27 | 84.9°F (1987) | 21.0°F (1947) | 1.36 in (1996) |
| September 28 | 82.0°F (1983) | 23.0°F (1942) | 1.26 in (1971) |
| September 29 | 82.9°F (1986) | 21.0°F (1949) | 0.83 in (2008) |
| September 30 | 82.9°F (2025) | 21.0°F (1945) | 2.48 in (2007) |