September weather in Milan, IL
The average temperature in Milan in September is 66.1°F (54.2°F–77.9°F). Average precipitation: 3.32 inches.
September is a fall month in Milan, and is warmer than the annual average of 51.2°F. Daily temperatures swing about 23.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
77.9°F
Avg Low
54.2°F
Precipitation
3.32 in
Daylight
12h 16m
September records in Milan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1953) | 41.0°F (1967) | 1.56 in (2010) |
| September 2 | 99.0°F (1953) | 37.9°F (1946) | 2.99 in (1970) |
| September 3 | 96.1°F (1947) | 43.0°F (1974) | 1.70 in (2022) |
| September 4 | 97.0°F (1954) | 39.0°F (1974) | 2.23 in (2008) |
| September 5 | 95.0°F (1954) | 42.1°F (1974) | 1.03 in (1975) |
| September 6 | 98.1°F (1960) | 39.9°F (1988) | 2.40 in (1989) |
| September 7 | 97.0°F (1960) | 39.0°F (1956) | 0.89 in (2012) |
| September 8 | 95.0°F (1971) | 37.9°F (1986) | 1.73 in (2020) |
| September 9 | 99.0°F (2013) | 43.0°F (2008) | 3.24 in (2014) |
| September 10 | 97.0°F (2013) | 42.1°F (1943) | 1.05 in (2014) |
| September 11 | 97.0°F (2000) | 41.0°F (1967) | 1.95 in (1950) |
| September 12 | 95.0°F (1991) | 37.9°F (1955) | 2.29 in (2008) |
| September 13 | 96.1°F (2025) | 37.0°F (1953) | 6.21 in (1961) |
| September 14 | 91.9°F (2025) | 37.9°F (2014) | 2.32 in (1998) |
| September 15 | 91.9°F (1955) | 36.0°F (2007) | 1.79 in (2019) |
| September 16 | 90.0°F (2018) | 37.0°F (1984) | 2.27 in (1997) |
| September 17 | 95.0°F (1988) | 37.0°F (1943) | 2.40 in (1978) |
| September 18 | 91.9°F (1947) | 36.0°F (1959) | 1.22 in (2001) |
| September 19 | 93.0°F (1948) | 34.0°F (1991) | 0.88 in (1986) |
| September 20 | 95.0°F (2022) | 30.0°F (1956) | 2.89 in (1965) |
| September 21 | 91.9°F (2007) | 32.0°F (1991) | 3.32 in (1947) |
| September 22 | 93.0°F (2017) | 32.0°F (1995) | 1.62 in (2000) |
| September 23 | 93.9°F (2017) | 30.9°F (1995) | 2.09 in (1970) |
| September 24 | 91.0°F (2007) | 30.0°F (1989) | 1.41 in (1986) |
| September 25 | 91.0°F (2017) | 35.1°F (1989) | 1.56 in (1993) |
| September 26 | 89.1°F (1998) | 34.0°F (1975) | 2.12 in (1959) |
| September 27 | 90.0°F (1990) | 33.1°F (1985) | 2.05 in (1999) |
| September 28 | 95.0°F (1953) | 33.1°F (1957) | 1.87 in (1999) |
| September 29 | 99.0°F (1953) | 30.0°F (1949) | 1.12 in (1986) |
| September 30 | 91.9°F (1952) | 30.0°F (1984) | 1.08 in (1995) |