September weather in Mount Vernon, IN
The average temperature in Mount Vernon in September is 69.4°F (57.3°F–81.6°F). Average precipitation: 3.20 inches.
September is a fall month in Mount Vernon, and is warmer than the annual average of 56°F. Daily temperatures swing about 24.3°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
81.6°F
Avg Low
57.3°F
Precipitation
3.20 in
Daylight
12h 14m
September records in Mount Vernon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1953) | 46.0°F (1967) | 2.71 in (1970) |
| September 2 | 107.1°F (1953) | 48.0°F (1919) | 3.30 in (2012) |
| September 3 | 107.1°F (1953) | 46.9°F (1965) | 2.45 in (1932) |
| September 4 | 104.0°F (1925) | 46.0°F (1974) | 2.00 in (1923) |
| September 5 | 102.9°F (1925) | 46.0°F (1902) | 3.94 in (1906) |
| September 6 | 105.1°F (1925) | 46.0°F (1924) | 1.53 in (2009) |
| September 7 | 102.9°F (1925) | 45.0°F (1956) | 2.92 in (1971) |
| September 8 | 100.0°F (1899) | 44.1°F (1986) | 1.30 in (1914) |
| September 9 | 98.1°F (1925) | 44.1°F (1986) | 2.00 in (2018) |
| September 10 | 99.0°F (1955) | 42.1°F (1924) | 2.44 in (1959) |
| September 11 | 99.0°F (1903) | 42.1°F (1917) | 0.98 in (1984) |
| September 12 | 100.0°F (1896) | 41.0°F (1917) | 3.55 in (1965) |
| September 13 | 100.0°F (1896) | 36.0°F (1902) | 2.02 in (1930) |
| September 14 | 100.0°F (1896) | 36.0°F (1902) | 1.85 in (1978) |
| September 15 | 98.1°F (1896) | 39.0°F (1902) | 2.40 in (1930) |
| September 16 | 96.1°F (1897) | 37.9°F (1916) | 2.24 in (1996) |
| September 17 | 96.1°F (1927) | 43.0°F (1937) | 1.66 in (1889) |
| September 18 | 97.0°F (1896) | 37.0°F (1901) | 3.57 in (1986) |
| September 19 | 102.9°F (1953) | 36.0°F (1901) | 1.82 in (2011) |
| September 20 | 96.1°F (1895) | 39.0°F (1896) | 2.17 in (1932) |
| September 21 | 96.1°F (1895) | 37.9°F (1927) | 2.46 in (1954) |
| September 22 | 98.1°F (1955) | 37.9°F (1927) | 2.25 in (1919) |
| September 23 | 96.1°F (1955) | 35.1°F (1974) | 3.36 in (2006) |
| September 24 | 91.9°F (1961) | 33.1°F (1928) | 2.66 in (2006) |
| September 25 | 93.0°F (2016) | 32.0°F (2001) | 7.27 in (1945) |
| September 26 | 91.9°F (1905) | 30.0°F (1928) | 2.60 in (2018) |
| September 27 | 93.9°F (1897) | 37.0°F (1942) | 2.80 in (2007) |
| September 28 | 91.9°F (1998) | 32.0°F (1942) | 3.84 in (1915) |
| September 29 | 97.0°F (1953) | 35.1°F (1942) | 1.80 in (1974) |
| September 30 | 102.0°F (1953) | 10.9°F (1927) | 2.35 in (1955) |