September weather in Hillsdale, IL
The average temperature in Hillsdale in September is 65.8°F (54.5°F–77.1°F). Average precipitation: 3.57 inches.
September is a fall month in Hillsdale, and is warmer than the annual average of 50.9°F. Daily temperatures swing about 22.6°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
77.1°F
Avg Low
54.5°F
Precipitation
3.57 in
Daylight
12h 16m
September records in Hillsdale
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2011) | 41.0°F (1967) | 2.77 in (1931) |
| September 2 | 95.0°F (1960) | 39.9°F (1946) | 2.38 in (1934) |
| September 3 | 95.0°F (1947) | 30.0°F (1907) | 5.20 in (1926) |
| September 4 | 93.9°F (1945) | 39.9°F (1974) | 2.59 in (2008) |
| September 5 | 97.0°F (1899) | 44.1°F (1962) | 1.65 in (1929) |
| September 6 | 96.1°F (1990) | 41.0°F (1962) | 3.69 in (2020) |
| September 7 | 97.0°F (1985) | 39.9°F (1986) | 2.15 in (1997) |
| September 8 | 99.0°F (1971) | 39.9°F (1986) | 2.20 in (1948) |
| September 9 | 99.0°F (2013) | 45.0°F (1907) | 3.03 in (1903) |
| September 10 | 97.0°F (2013) | 41.0°F (1967) | 1.38 in (2014) |
| September 11 | 96.1°F (2000) | 39.0°F (1967) | 2.25 in (2022) |
| September 12 | 93.9°F (1991) | 39.9°F (1902) | 1.75 in (1936) |
| September 13 | 93.9°F (2025) | 37.0°F (1902) | 6.00 in (2008) |
| September 14 | 91.9°F (1971) | 39.0°F (1963) | 2.02 in (1998) |
| September 15 | 95.0°F (1906) | 37.0°F (2007) | 2.00 in (1934) |
| September 16 | 95.0°F (1906) | 37.9°F (1984) | 1.55 in (1936) |
| September 17 | 98.1°F (1906) | 37.0°F (1943) | 3.38 in (1978) |
| September 18 | 95.0°F (1906) | 33.1°F (1959) | 1.42 in (2015) |
| September 19 | 93.9°F (2013) | -5.1°F (1947) | 1.39 in (1900) |
| September 20 | 93.9°F (2018) | -6.0°F (1947) | 1.98 in (1965) |
| September 21 | 91.9°F (1908) | 35.1°F (1991) | 4.37 in (1947) |
| September 22 | 93.9°F (2017) | 33.1°F (1983) | 2.70 in (1902) |
| September 23 | 93.0°F (2017) | 30.9°F (1995) | 1.36 in (1946) |
| September 24 | 91.0°F (2017) | 33.1°F (1989) | 0.99 in (1945) |
| September 25 | 95.0°F (1906) | 30.0°F (1942) | 3.10 in (1904) |
| September 26 | 90.0°F (1998) | 32.0°F (1942) | 1.90 in (1933) |
| September 27 | 90.0°F (1905) | 30.0°F (1942) | 2.82 in (1999) |
| September 28 | 98.1°F (1946) | 24.1°F (1942) | 2.43 in (1999) |
| September 29 | 91.0°F (2025) | 28.0°F (1908) | 4.00 in (1906) |
| September 30 | 91.0°F (1971) | 25.0°F (1899) | 1.07 in (1995) |