September weather in Mount Carroll, IL
The average temperature in Mount Carroll in September is 63.3°F (49.6°F–76.9°F). Average precipitation: 3.71 inches.
September is a fall month in Mount Carroll, and is warmer than the annual average of 48.5°F. Daily temperatures swing about 27.3°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
76.9°F
Avg Low
49.6°F
Precipitation
3.71 in
Daylight
12h 16m
September records in Mount Carroll
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1953) | 35.1°F (1901) | 3.40 in (1989) |
| September 2 | 97.0°F (1913) | 36.0°F (1909) | 3.98 in (1942) |
| September 3 | 95.0°F (1925) | 35.1°F (1908) | 2.68 in (2018) |
| September 4 | 99.0°F (1925) | 34.0°F (1974) | 1.22 in (1916) |
| September 5 | 97.0°F (1899) | 32.0°F (1988) | 1.69 in (1898) |
| September 6 | 99.0°F (1922) | 27.0°F (1988) | 2.04 in (1982) |
| September 7 | 99.0°F (1939) | 27.0°F (1988) | 1.61 in (1946) |
| September 8 | 98.1°F (1922) | 30.0°F (1988) | 3.66 in (1941) |
| September 9 | 96.1°F (1912) | 33.1°F (1986) | 4.65 in (1927) |
| September 10 | 98.1°F (2013) | 33.1°F (1910) | 1.71 in (2014) |
| September 11 | 97.0°F (2013) | 34.0°F (1993) | 2.27 in (1925) |
| September 12 | 93.9°F (1908) | 28.9°F (1902) | 2.13 in (1949) |
| September 13 | 95.0°F (1939) | 30.0°F (1902) | 3.18 in (1961) |
| September 14 | 97.0°F (1939) | 32.0°F (1975) | 5.00 in (1961) |
| September 15 | 97.0°F (1939) | 30.0°F (1989) | 1.81 in (2019) |
| September 16 | 95.0°F (1931) | 30.9°F (1989) | 2.41 in (1927) |
| September 17 | 91.9°F (1925) | 32.0°F (1937) | 2.67 in (1970) |
| September 18 | 93.9°F (1988) | 26.1°F (1903) | 2.96 in (2015) |
| September 19 | 91.9°F (1908) | 28.9°F (1901) | 3.83 in (2001) |
| September 20 | 93.0°F (1920) | 28.9°F (1956) | 2.00 in (1965) |
| September 21 | 93.0°F (1908) | 30.0°F (1991) | 3.46 in (1947) |
| September 22 | 90.0°F (1937) | 26.1°F (1976) | 1.41 in (2019) |
| September 23 | 91.9°F (2017) | 23.0°F (1983) | 3.10 in (1986) |
| September 24 | 95.0°F (2017) | 19.9°F (1989) | 2.30 in (1970) |
| September 25 | 93.9°F (1920) | 24.1°F (1989) | 1.27 in (1981) |
| September 26 | 93.0°F (2017) | 24.1°F (1928) | 2.19 in (1993) |
| September 27 | 90.0°F (1998) | 21.9°F (1989) | 2.10 in (1959) |
| September 28 | 90.0°F (1939) | 23.0°F (1989) | 1.91 in (1999) |
| September 29 | 93.9°F (1953) | 26.1°F (1908) | 2.02 in (1955) |
| September 30 | 90.0°F (1971) | 14.0°F (1899) | 1.50 in (1925) |