September weather in Vienna, IL
The average temperature in Vienna in September is 69.7°F (57.5°F–82.0°F). Average precipitation: 3.79 inches.
September is a fall month in Vienna, and is warmer than the annual average of 57.2°F. Daily temperatures swing about 24.5°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
82.0°F
Avg Low
57.5°F
Precipitation
3.79 in
Daylight
12h 14m
September records in Vienna
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2011) | 43.0°F (2025) | 1.25 in (1982) |
| September 2 | 100.0°F (2011) | 48.0°F (1987) | 2.75 in (2014) |
| September 3 | 99.0°F (1999) | 37.9°F (2025) | 1.71 in (2003) |
| September 4 | 100.0°F (1999) | 45.0°F (1974) | 1.37 in (1991) |
| September 5 | 100.0°F (1999) | 39.0°F (2025) | 1.94 in (1985) |
| September 6 | 99.0°F (1999) | 44.1°F (1988) | 1.98 in (2009) |
| September 7 | 99.0°F (2002) | 39.9°F (1988) | 1.47 in (1971) |
| September 8 | 99.0°F (2002) | 46.0°F (1986) | 1.09 in (1990) |
| September 9 | 99.0°F (2002) | 41.0°F (2024) | 0.81 in (1976) |
| September 10 | 97.0°F (1999) | 45.0°F (1976) | 2.90 in (2010) |
| September 11 | 96.1°F (1983) | 39.9°F (1976) | 1.17 in (1991) |
| September 12 | 93.9°F (1991) | 42.1°F (1968) | 1.57 in (1975) |
| September 13 | 95.0°F (1980) | 43.0°F (1975) | 1.35 in (1974) |
| September 14 | 98.1°F (2025) | 43.0°F (1975) | 2.56 in (1978) |
| September 15 | 96.1°F (2025) | 42.1°F (1974) | 1.60 in (1993) |
| September 16 | 96.1°F (2019) | 42.1°F (1979) | 1.96 in (1996) |
| September 17 | 96.1°F (2019) | 42.1°F (2000) | 1.32 in (1980) |
| September 18 | 93.0°F (1997) | 42.1°F (1999) | 2.65 in (2006) |
| September 19 | 93.9°F (1997) | 37.9°F (1973) | 1.85 in (2001) |
| September 20 | 96.1°F (2022) | 37.9°F (1991) | 4.35 in (2002) |
| September 21 | 98.1°F (2022) | 36.0°F (1991) | 1.96 in (1979) |
| September 22 | 98.1°F (2022) | 32.0°F (1983) | 1.08 in (2003) |
| September 23 | 97.0°F (2007) | 34.0°F (1995) | 3.93 in (2006) |
| September 24 | 95.0°F (2007) | 35.1°F (1983) | 1.73 in (1977) |
| September 25 | 93.0°F (2007) | 39.9°F (2001) | 1.38 in (2000) |
| September 26 | 90.0°F (1998) | 34.0°F (2001) | 1.50 in (1984) |
| September 27 | 91.9°F (1998) | 34.0°F (1991) | 2.26 in (2002) |
| September 28 | 93.0°F (1998) | 39.0°F (2022) | 0.67 in (2006) |
| September 29 | 93.0°F (1998) | 34.0°F (2003) | 1.17 in (1974) |
| September 30 | 93.9°F (1998) | 37.0°F (1992) | 0.83 in (2013) |