September weather in Salem, IL
The average temperature in Salem in September is 68.6°F (56.9°F–80.4°F). Average precipitation: 3.54 inches.
September is a fall month in Salem, and is warmer than the annual average of 54.9°F. Daily temperatures swing about 23.5°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
80.4°F
Avg Low
56.9°F
Precipitation
3.54 in
Daylight
12h 14m
September records in Salem
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1943) | 46.0°F (1967) | 3.19 in (1959) |
| September 2 | 99.0°F (2011) | 45.0°F (2017) | 1.90 in (2014) |
| September 3 | 98.1°F (2011) | 45.0°F (2017) | 3.12 in (1926) |
| September 4 | 97.0°F (1990) | 45.0°F (1974) | 2.54 in (1918) |
| September 5 | 99.0°F (1990) | 46.9°F (1972) | 2.56 in (1949) |
| September 6 | 100.0°F (1960) | 44.1°F (1988) | 0.79 in (2009) |
| September 7 | 98.1°F (1960) | 43.0°F (2017) | 0.90 in (1942) |
| September 8 | 99.0°F (1960) | 42.1°F (1986) | 2.20 in (2018) |
| September 9 | 98.1°F (1983) | 46.0°F (2024) | 6.36 in (2018) |
| September 10 | 98.1°F (1983) | 43.0°F (1976) | 2.50 in (2016) |
| September 11 | 93.9°F (2013) | 44.1°F (1970) | 2.08 in (1986) |
| September 12 | 95.0°F (1991) | 39.0°F (1968) | 2.56 in (1949) |
| September 13 | 95.0°F (1991) | 39.0°F (1975) | 1.80 in (1951) |
| September 14 | 96.1°F (2025) | 39.0°F (1964) | 2.20 in (1989) |
| September 15 | 99.0°F (2025) | 41.0°F (1961) | 2.51 in (1930) |
| September 16 | 91.9°F (2025) | 42.1°F (1961) | 2.51 in (1958) |
| September 17 | 93.0°F (2025) | 44.1°F (1961) | 2.37 in (2016) |
| September 18 | 91.9°F (1972) | 42.1°F (1961) | 1.45 in (1970) |
| September 19 | 97.0°F (2025) | 39.0°F (1991) | 1.75 in (1966) |
| September 20 | 91.9°F (1978) | 37.9°F (1991) | 1.86 in (2005) |
| September 21 | 97.0°F (2022) | 36.0°F (1991) | 1.52 in (1945) |
| September 22 | 95.0°F (2022) | 37.0°F (1976) | 1.72 in (1993) |
| September 23 | 91.9°F (1960) | 33.1°F (1974) | 2.50 in (1984) |
| September 24 | 93.0°F (2007) | 34.0°F (1989) | 1.35 in (1977) |
| September 25 | 91.0°F (1986) | 36.0°F (1965) | 1.77 in (1998) |
| September 26 | 90.0°F (1986) | 37.0°F (1944) | 3.20 in (2012) |
| September 27 | 89.1°F (2023) | 37.0°F (1989) | 1.99 in (2003) |
| September 28 | 91.0°F (1986) | 34.0°F (2001) | 1.54 in (1927) |
| September 29 | 91.0°F (1999) | 37.9°F (1962) | 1.37 in (1959) |
| September 30 | 91.9°F (1971) | 36.0°F (1963) | 1.81 in (1926) |