September weather in Otterville, IL
The average temperature in Otterville in September is 66.9°F (54.7°F–79.2°F). Average precipitation: 3.44 inches.
September is a fall month in Otterville, and is warmer than the annual average of 53.4°F. Daily temperatures swing about 24.5°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 14m. For travel, September is one of the best months of the year to visit.
Avg High
79.2°F
Avg Low
54.7°F
Precipitation
3.44 in
Daylight
12h 14m
September records in Otterville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (2013) | 43.0°F (1967) | 2.75 in (2012) |
| September 2 | 100.9°F (1984) | 43.0°F (1967) | 1.83 in (2014) |
| September 3 | 99.0°F (2011) | 42.1°F (1974) | 1.90 in (1993) |
| September 4 | 102.0°F (1954) | 41.0°F (1974) | 1.43 in (1962) |
| September 5 | 102.0°F (1954) | 42.1°F (1974) | 1.95 in (2008) |
| September 6 | 100.9°F (1954) | 37.9°F (1962) | 0.84 in (2007) |
| September 7 | 98.1°F (1954) | 41.0°F (1956) | 2.17 in (1996) |
| September 8 | 100.0°F (1960) | 36.0°F (1986) | 1.98 in (1972) |
| September 9 | 99.0°F (1955) | 39.0°F (2024) | 3.78 in (1989) |
| September 10 | 97.0°F (1955) | 39.0°F (1969) | 2.95 in (2014) |
| September 11 | 96.1°F (1983) | 39.0°F (1959) | 2.10 in (1975) |
| September 12 | 97.0°F (1956) | 36.0°F (1955) | 1.38 in (2008) |
| September 13 | 98.1°F (1956) | 36.0°F (1964) | 1.72 in (1943) |
| September 14 | 98.1°F (1998) | 39.0°F (1964) | 2.66 in (2008) |
| September 15 | 98.1°F (2025) | 34.0°F (2011) | 1.56 in (1993) |
| September 16 | 96.1°F (1954) | 37.0°F (1979) | 1.41 in (1965) |
| September 17 | 95.0°F (1954) | 37.9°F (1979) | 2.71 in (1969) |
| September 18 | 95.0°F (1953) | 37.0°F (1981) | 2.22 in (1968) |
| September 19 | 93.9°F (1940) | 37.0°F (1991) | 1.90 in (1966) |
| September 20 | 96.1°F (1940) | 34.0°F (1962) | 2.22 in (1954) |
| September 21 | 96.1°F (1940) | 32.0°F (1991) | 2.02 in (2009) |
| September 22 | 95.0°F (1956) | 32.0°F (1983) | 1.46 in (1955) |
| September 23 | 95.0°F (1956) | 27.0°F (1983) | 3.50 in (1993) |
| September 24 | 91.9°F (2007) | 32.0°F (1989) | 2.02 in (2024) |
| September 25 | 91.0°F (2017) | 34.0°F (1989) | 3.75 in (1961) |
| September 26 | 91.0°F (1953) | 30.9°F (1940) | 1.08 in (2012) |
| September 27 | 91.0°F (2017) | 32.0°F (1940) | 1.16 in (1964) |
| September 28 | 97.0°F (1953) | 24.1°F (1942) | 0.58 in (2020) |
| September 29 | 100.9°F (1953) | 33.1°F (1957) | 1.62 in (1999) |
| September 30 | 96.1°F (1953) | 28.9°F (1984) | 1.66 in (1986) |