September weather in Palmer, IL
The average temperature in Palmer in September is 68.1°F (55.6°F–80.7°F). Average precipitation: 3.53 inches.
September is a fall month in Palmer, and is warmer than the annual average of 53.6°F. Daily temperatures swing about 25.1°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
80.7°F
Avg Low
55.6°F
Precipitation
3.53 in
Daylight
12h 15m
September records in Palmer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2011) | 44.1°F (1987) | 4.71 in (2003) |
| September 2 | 100.9°F (2011) | 43.0°F (2017) | 1.30 in (2014) |
| September 3 | 100.0°F (2011) | 44.1°F (2017) | 2.60 in (2010) |
| September 4 | 98.1°F (2011) | 39.9°F (1984) | 1.75 in (1991) |
| September 5 | 96.1°F (1999) | 43.0°F (1984) | 2.07 in (2008) |
| September 6 | 97.0°F (1990) | 37.9°F (1988) | 1.07 in (2009) |
| September 7 | 97.0°F (1990) | 39.0°F (1988) | 0.65 in (2001) |
| September 8 | 93.0°F (1990) | 35.1°F (1986) | 0.53 in (2012) |
| September 9 | 93.9°F (1983) | 41.0°F (2025) | 3.14 in (1984) |
| September 10 | 97.0°F (2013) | 43.0°F (1999) | 1.17 in (2022) |
| September 11 | 98.1°F (1983) | 42.1°F (1992) | 1.52 in (1984) |
| September 12 | 95.0°F (2013) | 42.1°F (2007) | 1.96 in (2008) |
| September 13 | 93.0°F (2005) | 39.0°F (2014) | 1.98 in (2008) |
| September 14 | 99.0°F (2025) | 36.0°F (2014) | 1.88 in (2008) |
| September 15 | 100.0°F (2025) | 34.0°F (2007) | 2.61 in (2008) |
| September 16 | 93.9°F (2025) | 37.9°F (1984) | 1.19 in (2014) |
| September 17 | 95.0°F (2024) | 39.9°F (1984) | 1.82 in (1980) |
| September 18 | 95.0°F (2024) | 37.0°F (1981) | 1.13 in (1982) |
| September 19 | 96.1°F (2025) | 35.1°F (1991) | 1.84 in (2022) |
| September 20 | 95.0°F (2005) | 32.0°F (1991) | 1.74 in (1986) |
| September 21 | 96.1°F (2022) | 33.1°F (1991) | 0.54 in (1983) |
| September 22 | 95.0°F (2017) | 30.9°F (1983) | 1.59 in (1992) |
| September 23 | 96.1°F (2005) | 28.9°F (1983) | 1.26 in (1994) |
| September 24 | 93.9°F (2007) | 32.0°F (1995) | 1.46 in (1993) |
| September 25 | 95.0°F (2017) | 30.0°F (1994) | 0.87 in (1998) |
| September 26 | 93.9°F (2017) | 35.1°F (1989) | 0.91 in (1994) |
| September 27 | 93.9°F (2017) | 33.1°F (1985) | 1.31 in (1981) |
| September 28 | 93.0°F (1998) | 36.0°F (2022) | 0.24 in (2024) |
| September 29 | 93.0°F (1986) | 33.1°F (2003) | 1.40 in (1999) |
| September 30 | 90.0°F (2025) | 30.9°F (1984) | 1.66 in (1986) |