September weather in Dover, IL
The average temperature in Dover in September is 64.5°F (53.0°F–76.1°F). Average precipitation: 3.90 inches.
September is a fall month in Dover, and is warmer than the annual average of 49.7°F. Daily temperatures swing about 23.1°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.1°F
Avg Low
53.0°F
Precipitation
3.90 in
Daylight
12h 16m
September records in Dover
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2011) | 46.0°F (2009) | 2.01 in (1989) |
| September 2 | 95.0°F (2011) | 45.0°F (2017) | 2.20 in (1997) |
| September 3 | 90.0°F (2012) | 45.0°F (2017) | 1.20 in (1991) |
| September 4 | 93.0°F (2007) | 45.0°F (1997) | 1.93 in (2008) |
| September 5 | 93.9°F (1990) | 45.0°F (1988) | 0.67 in (2012) |
| September 6 | 95.0°F (1990) | 44.1°F (1988) | 4.10 in (1989) |
| September 7 | 91.9°F (2015) | 48.0°F (1988) | 0.68 in (2020) |
| September 8 | 91.9°F (2002) | 48.0°F (2017) | 1.53 in (2016) |
| September 9 | 91.9°F (1991) | 45.0°F (2008) | 1.67 in (1992) |
| September 10 | 96.1°F (2013) | 41.0°F (2010) | 1.64 in (2014) |
| September 11 | 96.1°F (2000) | 44.1°F (1993) | 1.80 in (2022) |
| September 12 | 95.0°F (2013) | 43.0°F (2007) | 1.34 in (2020) |
| September 13 | 95.0°F (2005) | 37.9°F (2014) | 6.15 in (2008) |
| September 14 | 90.0°F (1991) | 37.9°F (2014) | 1.70 in (2005) |
| September 15 | 90.0°F (1994) | 37.0°F (2007) | 1.50 in (2004) |
| September 16 | 86.0°F (2017) | 42.1°F (2014) | 0.92 in (2019) |
| September 17 | 91.0°F (1988) | 42.1°F (2014) | 1.42 in (1992) |
| September 18 | 90.0°F (2000) | 42.1°F (1991) | 1.54 in (2015) |
| September 19 | 88.0°F (2000) | 39.0°F (1991) | 4.43 in (2015) |
| September 20 | 91.0°F (2013) | 33.1°F (1991) | 1.29 in (2019) |
| September 21 | 93.0°F (2022) | 36.0°F (1991) | 0.68 in (1995) |
| September 22 | 90.0°F (1988) | 34.0°F (1995) | 1.14 in (2019) |
| September 23 | 91.9°F (2017) | 30.0°F (1995) | 0.95 in (2019) |
| September 24 | 91.0°F (2017) | 34.0°F (1989) | 1.14 in (2008) |
| September 25 | 89.1°F (2017) | 36.0°F (2001) | 1.13 in (1993) |
| September 26 | 90.0°F (1998) | 39.9°F (1989) | 2.02 in (2011) |
| September 27 | 89.1°F (2017) | 37.0°F (1989) | 4.05 in (2023) |
| September 28 | 88.0°F (2021) | 36.0°F (2003) | 5.90 in (2019) |
| September 29 | 87.1°F (2002) | 36.0°F (1992) | 0.41 in (1998) |
| September 30 | 88.0°F (2021) | 35.1°F (1993) | 0.54 in (1995) |