September weather in Karnak, IL
The average temperature in Karnak in September is 71.5°F (60.2°F–82.7°F). Average precipitation: 3.35 inches.
September is a fall month in Karnak, and is warmer than the annual average of 57.9°F. Daily temperatures swing about 22.5°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
82.7°F
Avg Low
60.2°F
Precipitation
3.35 in
Daylight
12h 14m
September records in Karnak
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1925) | 53.1°F (2009) | 1.01 in (2001) |
| September 2 | 102.0°F (1925) | 39.0°F (2020) | 2.60 in (2012) |
| September 3 | 104.0°F (1925) | 50.0°F (1924) | 2.08 in (1932) |
| September 4 | 105.1°F (1925) | 48.9°F (1928) | 1.19 in (1933) |
| September 5 | 105.1°F (1925) | 48.9°F (1928) | 2.57 in (1991) |
| September 6 | 108.0°F (1925) | 46.9°F (1924) | 2.25 in (1948) |
| September 7 | 104.0°F (1925) | 51.1°F (2011) | 1.13 in (1929) |
| September 8 | 102.9°F (1925) | 45.0°F (2025) | 1.01 in (1948) |
| September 9 | 102.9°F (1925) | 50.0°F (2024) | 1.50 in (1929) |
| September 10 | 98.1°F (1925) | 44.1°F (1924) | 2.70 in (2010) |
| September 11 | 95.0°F (2002) | 50.0°F (1926) | 2.80 in (2010) |
| September 12 | 95.0°F (1927) | 42.1°F (1999) | 2.20 in (1934) |
| September 13 | 96.1°F (1927) | 42.1°F (1999) | 2.25 in (1925) |
| September 14 | 98.1°F (1927) | 48.0°F (2007) | 1.35 in (1934) |
| September 15 | 98.1°F (1927) | 48.0°F (1923) | 1.80 in (2011) |
| September 16 | 97.0°F (1927) | 46.9°F (1923) | 1.70 in (2005) |
| September 17 | 98.1°F (1927) | 46.9°F (2000) | 0.80 in (1998) |
| September 18 | 95.0°F (1925) | 39.9°F (2012) | 1.70 in (2006) |
| September 19 | 97.0°F (1925) | 44.1°F (1928) | 0.88 in (2001) |
| September 20 | 93.0°F (1926) | 44.1°F (1999) | 1.80 in (2002) |
| September 21 | 96.1°F (2022) | 37.9°F (1927) | 2.28 in (1925) |
| September 22 | 98.1°F (2022) | 41.0°F (1927) | 1.53 in (1947) |
| September 23 | 91.9°F (2010) | 45.0°F (1999) | 1.72 in (1993) |
| September 24 | 91.9°F (2007) | 36.0°F (1928) | 2.10 in (1993) |
| September 25 | 91.0°F (2016) | 43.0°F (2001) | 4.15 in (1945) |
| September 26 | 89.1°F (1998) | 36.0°F (1928) | 1.52 in (2011) |
| September 27 | 90.0°F (1923) | 41.0°F (2001) | 1.98 in (2002) |
| September 28 | 93.0°F (1923) | 43.0°F (2000) | 3.80 in (2024) |
| September 29 | 91.0°F (1998) | 43.0°F (1924) | 2.30 in (1934) |
| September 30 | 93.0°F (2019) | 37.0°F (1924) | 1.35 in (1939) |