September weather in St. Elmo, IL
The average temperature in St. Elmo in September is 68.2°F (56.4°F–80.0°F). Average precipitation: 3.38 inches.
September is a fall month in St. Elmo, and is warmer than the annual average of 54.6°F. Daily temperatures swing about 23.6°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
80.0°F
Avg Low
56.4°F
Precipitation
3.38 in
Daylight
12h 14m
September records in St. Elmo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2002) | 53.1°F (1999) | 1.72 in (2003) |
| September 2 | 95.0°F (2002) | 46.0°F (1994) | 1.58 in (2003) |
| September 3 | 93.0°F (1999) | 48.9°F (1994) | 3.85 in (1993) |
| September 4 | 95.0°F (2007) | 42.1°F (1997) | 0.25 in (1995) |
| September 5 | 93.9°F (2007) | 39.9°F (1997) | 0.84 in (2006) |
| September 6 | 95.0°F (1999) | 48.0°F (2003) | 0.41 in (2006) |
| September 7 | 95.0°F (2002) | 46.9°F (2003) | 0.31 in (2007) |
| September 8 | 96.1°F (2002) | 48.9°F (1994) | 0.35 in (1992) |
| September 9 | 97.0°F (2002) | 48.9°F (1993) | 0.37 in (1997) |
| September 10 | 93.9°F (2002) | 44.1°F (1999) | 1.00 in (2000) |
| September 11 | 93.9°F (2002) | 42.1°F (1993) | 0.90 in (2000) |
| September 12 | 89.1°F (1994) | 43.0°F (1997) | 1.18 in (2006) |
| September 13 | 90.0°F (1994) | 45.0°F (2007) | 0.20 in (1999) |
| September 14 | 91.0°F (1994) | 39.9°F (1996) | 1.32 in (1993) |
| September 15 | 93.0°F (1994) | 37.0°F (1996) | 0.18 in (2002) |
| September 16 | 90.0°F (1994) | 42.1°F (2000) | 0.75 in (1996) |
| September 17 | 91.0°F (1997) | 42.1°F (1999) | 0.55 in (1997) |
| September 18 | 86.0°F (1992) | 44.1°F (1995) | 0.57 in (2002) |
| September 19 | 88.0°F (2007) | 43.0°F (1996) | 0.22 in (2005) |
| September 20 | 90.0°F (2007) | 39.0°F (2006) | 1.28 in (2005) |
| September 21 | 91.0°F (2007) | 43.0°F (1999) | 0.59 in (1992) |
| September 22 | 93.0°F (2007) | 34.0°F (1995) | 0.30 in (2003) |
| September 23 | 90.0°F (2005) | 30.0°F (1995) | 2.39 in (1993) |
| September 24 | 93.0°F (2007) | 28.9°F (1995) | 0.54 in (1993) |
| September 25 | 89.1°F (2007) | 39.0°F (1996) | 1.43 in (2000) |
| September 26 | 88.0°F (1999) | 37.0°F (2000) | 1.05 in (2005) |
| September 27 | 82.9°F (1999) | 42.1°F (1995) | 1.55 in (1996) |
| September 28 | 90.0°F (1999) | 42.1°F (1993) | 0.17 in (1996) |
| September 29 | 90.0°F (1999) | 35.1°F (1992) | 1.32 in (1999) |
| September 30 | 88.0°F (2002) | 34.0°F (1993) | 0.03 in (1999) |