September weather in Lewistown, IL
The average temperature in Lewistown in September is 66.9°F (53.5°F–80.4°F). Average precipitation: 3.26 inches.
September is a fall month in Lewistown, and is warmer than the annual average of 52.5°F. Daily temperatures swing about 26.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
80.4°F
Avg Low
53.5°F
Precipitation
3.26 in
Daylight
12h 15m
September records in Lewistown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2000) | 43.0°F (1967) | 2.50 in (2003) |
| September 2 | 100.0°F (1984) | 46.0°F (1967) | 2.21 in (1934) |
| September 3 | 98.1°F (2000) | 45.0°F (1974) | 2.15 in (1993) |
| September 4 | 93.9°F (1998) | 42.1°F (1974) | 2.68 in (1973) |
| September 5 | 95.0°F (1983) | 44.1°F (1974) | 2.30 in (2008) |
| September 6 | 98.1°F (1998) | 39.0°F (1988) | 1.25 in (2009) |
| September 7 | 99.0°F (1985) | 37.9°F (1988) | 1.48 in (1941) |
| September 8 | 98.1°F (1985) | 36.0°F (1986) | 2.53 in (2016) |
| September 9 | 97.0°F (1985) | 37.9°F (1986) | 2.34 in (1926) |
| September 10 | 98.1°F (1983) | 39.0°F (1999) | 3.21 in (1937) |
| September 11 | 98.1°F (1983) | 41.0°F (1967) | 1.60 in (2014) |
| September 12 | 97.0°F (2000) | 44.1°F (1967) | 2.30 in (1961) |
| September 13 | 95.0°F (1998) | 44.1°F (1975) | 2.64 in (1936) |
| September 14 | 93.9°F (1971) | 37.0°F (1999) | 3.90 in (1961) |
| September 15 | 93.0°F (1991) | 37.0°F (1979) | 2.25 in (1931) |
| September 16 | 91.9°F (1994) | 36.0°F (2000) | 1.70 in (1965) |
| September 17 | 93.0°F (1997) | 36.0°F (1999) | 1.38 in (1967) |
| September 18 | 93.0°F (1972) | 39.9°F (1999) | 1.79 in (1968) |
| September 19 | 96.1°F (1978) | 36.0°F (1991) | 2.40 in (1975) |
| September 20 | 91.9°F (1978) | 34.0°F (2003) | 1.26 in (1924) |
| September 21 | 91.9°F (1980) | 33.1°F (1991) | 1.65 in (2009) |
| September 22 | 91.9°F (1986) | 30.9°F (1999) | 1.86 in (1970) |
| September 23 | 95.0°F (2005) | 28.0°F (1995) | 1.85 in (1985) |
| September 24 | 88.0°F (2004) | 30.0°F (1989) | 1.82 in (1970) |
| September 25 | 89.1°F (1984) | 33.1°F (1989) | 1.86 in (1941) |
| September 26 | 90.0°F (1999) | 32.0°F (2000) | 2.00 in (1942) |
| September 27 | 91.9°F (1998) | 34.0°F (1989) | 3.11 in (1936) |
| September 28 | 91.0°F (1971) | 34.0°F (1989) | 2.24 in (2019) |
| September 29 | 90.0°F (1971) | 30.9°F (2003) | 1.96 in (1972) |
| September 30 | 93.0°F (1971) | 30.0°F (1984) | 1.18 in (1955) |