September weather in Mount Vernon, OH
The average temperature in Mount Vernon in September is 61.5°F (48.6°F–74.4°F). Average precipitation: inches.
September is a fall month in Mount Vernon, and is warmer than the annual average of 48.5°F. Daily temperatures swing about 25.8°F between overnight low and afternoon high. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
74.4°F
Avg Low
48.6°F
Precipitation
in
Daylight
12h 15m
September records in Mount Vernon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (1953) | 37.9°F (1948) | 1.76 in (2001) |
| September 2 | 99.0°F (1953) | 39.0°F (1949) | 1.71 in (1947) |
| September 3 | 99.0°F (1953) | 34.0°F (1946) | 1.70 in (1993) |
| September 4 | 95.0°F (1953) | 35.1°F (1946) | 2.71 in (1988) |
| September 5 | 93.0°F (1973) | 35.1°F (1974) | 1.48 in (1986) |
| September 6 | 96.1°F (1945) | 35.1°F (1974) | 1.95 in (1969) |
| September 7 | 98.1°F (1945) | 36.0°F (1988) | 0.99 in (1961) |
| September 8 | 93.9°F (1946) | 32.0°F (1951) | 1.91 in (2009) |
| September 9 | 95.0°F (1964) | 32.0°F (1986) | 2.08 in (1970) |
| September 10 | 95.0°F (1964) | 35.1°F (1943) | 1.39 in (1978) |
| September 11 | 96.1°F (1964) | 36.0°F (1995) | 0.97 in (1955) |
| September 12 | 93.0°F (1952) | 34.0°F (1943) | 1.30 in (2006) |
| September 13 | 91.9°F (1952) | 32.0°F (1975) | 1.40 in (1951) |
| September 14 | 90.0°F (1952) | 28.9°F (1975) | 4.82 in (1979) |
| September 15 | 90.0°F (1942) | 32.0°F (1975) | 1.08 in (1982) |
| September 16 | 89.1°F (1970) | 33.1°F (1984) | 1.04 in (1996) |
| September 17 | 91.0°F (1948) | 30.9°F (1984) | 1.13 in (2004) |
| September 18 | 91.0°F (1955) | 30.0°F (1959) | 1.70 in (2003) |
| September 19 | 91.9°F (1955) | 34.0°F (1973) | 1.50 in (1952) |
| September 20 | 90.0°F (1955) | 32.0°F (1973) | 1.38 in (1966) |
| September 21 | 90.0°F (1978) | 27.0°F (1956) | 1.57 in (1967) |
| September 22 | 90.0°F (1970) | 30.0°F (1995) | 1.20 in (1947) |
| September 23 | 90.0°F (1970) | 26.1°F (1974) | 1.45 in (1945) |
| September 24 | 90.0°F (1959) | 27.0°F (1974) | 2.05 in (1999) |
| September 25 | 90.0°F (1959) | 27.0°F (1942) | 1.96 in (1986) |
| September 26 | 88.0°F (1959) | 30.0°F (1947) | 1.90 in (2003) |
| September 27 | 89.1°F (1998) | 30.0°F (1943) | 1.00 in (1942) |
| September 28 | 88.0°F (1946) | 28.0°F (1942) | 1.78 in (1967) |
| September 29 | 93.0°F (1953) | 23.0°F (1942) | 1.45 in (1999) |
| September 30 | 91.9°F (1953) | 26.1°F (1978) | 1.83 in (1972) |