September weather in Stoy, IL
The average temperature in Stoy in September is 68.2°F (55.5°F–80.9°F). Average precipitation: 3.66 inches.
September is a fall month in Stoy, and is warmer than the annual average of 54.1°F. Daily temperatures swing about 25.4°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
80.9°F
Avg Low
55.5°F
Precipitation
3.66 in
Daylight
12h 14m
September records in Stoy
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2013) | 48.9°F (2009) | 1.64 in (1905) |
| September 2 | 100.0°F (2011) | 43.0°F (1908) | 3.73 in (2014) |
| September 3 | 100.0°F (2011) | 51.1°F (2005) | 0.55 in (2014) |
| September 4 | 100.0°F (2011) | 48.0°F (1902) | 1.63 in (1911) |
| September 5 | 102.9°F (1899) | 44.1°F (1902) | 0.85 in (1910) |
| September 6 | 102.9°F (1899) | 43.0°F (2017) | 0.92 in (2012) |
| September 7 | 102.0°F (1899) | 41.0°F (2017) | 0.88 in (1910) |
| September 8 | 99.0°F (1897) | 42.1°F (2017) | 1.30 in (2012) |
| September 9 | 97.0°F (1897) | 42.1°F (2017) | 0.67 in (2015) |
| September 10 | 98.1°F (1897) | 39.9°F (2017) | 1.60 in (1911) |
| September 11 | 100.0°F (1897) | 46.0°F (2017) | 4.67 in (2000) |
| September 12 | 100.0°F (1897) | 46.0°F (2002) | 2.47 in (2006) |
| September 13 | 99.0°F (1897) | 35.1°F (1902) | 1.13 in (2008) |
| September 14 | 97.0°F (1897) | 33.1°F (1902) | 0.43 in (1911) |
| September 15 | 99.0°F (1897) | 37.0°F (1902) | 1.66 in (1911) |
| September 16 | 98.1°F (1897) | 39.0°F (2007) | 0.61 in (1905) |
| September 17 | 93.0°F (1908) | 39.9°F (1900) | 0.72 in (1896) |
| September 18 | 91.9°F (1908) | 34.0°F (1903) | 1.86 in (2006) |
| September 19 | 93.0°F (2018) | 34.0°F (1901) | 1.50 in (1900) |
| September 20 | 95.0°F (1908) | 37.9°F (2003) | 1.08 in (2005) |
| September 21 | 96.1°F (2018) | 35.1°F (1897) | 2.97 in (2009) |
| September 22 | 97.0°F (2010) | 39.0°F (1897) | 1.22 in (2003) |
| September 23 | 95.0°F (2024) | 37.0°F (2012) | 0.92 in (2006) |
| September 24 | 96.1°F (2007) | 34.0°F (2012) | 1.85 in (2025) |
| September 25 | 93.9°F (2007) | 34.0°F (2012) | 5.10 in (1898) |
| September 26 | 96.1°F (1897) | 33.1°F (2001) | 2.00 in (1904) |
| September 27 | 91.0°F (2017) | 32.0°F (1899) | 1.48 in (2003) |
| September 28 | 91.9°F (2019) | 37.9°F (1909) | 1.80 in (1900) |
| September 29 | 91.9°F (2019) | 34.0°F (1899) | 1.25 in (1906) |
| September 30 | 93.0°F (2019) | 25.0°F (1899) | 1.29 in (2015) |