September weather in Mount Vernon, TX
The average temperature in Mount Vernon in September is 76.4°F (64.7°F–88.2°F). Average precipitation: 3.58 inches.
September is a fall month in Mount Vernon, and is warmer than the annual average of 64.6°F. Daily temperatures swing about 23.5°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 12m. For travel, September is hot.
Avg High
88.2°F
Avg Low
64.7°F
Precipitation
3.58 in
Daylight
12h 12m
September records in Mount Vernon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 106.0°F (2000) | 55.9°F (1967) | 1.11 in (1976) |
| September 2 | 107.1°F (2000) | 53.1°F (1967) | 1.09 in (2020) |
| September 3 | 106.0°F (2000) | 54.0°F (1967) | 1.59 in (1991) |
| September 4 | 107.1°F (2000) | 48.9°F (1974) | 0.81 in (2018) |
| September 5 | 108.0°F (2000) | 51.1°F (1974) | 0.88 in (2007) |
| September 6 | 102.9°F (2012) | 48.9°F (1974) | 4.82 in (1973) |
| September 7 | 106.0°F (2012) | 51.1°F (2011) | 2.13 in (1973) |
| September 8 | 104.0°F (2012) | 51.1°F (2017) | 0.70 in (2002) |
| September 9 | 100.9°F (1972) | 50.0°F (2024) | 1.53 in (2001) |
| September 10 | 100.0°F (1972) | 52.0°F (2024) | 1.81 in (1972) |
| September 11 | 100.9°F (1980) | 53.1°F (1968) | 2.40 in (1990) |
| September 12 | 99.0°F (1980) | 53.1°F (1968) | 2.46 in (2003) |
| September 13 | 102.0°F (2011) | 55.0°F (1968) | 2.25 in (2009) |
| September 14 | 108.0°F (2011) | 51.1°F (1968) | 2.13 in (2008) |
| September 15 | 102.0°F (1980) | 48.0°F (1993) | 2.47 in (1998) |
| September 16 | 102.9°F (1980) | 46.9°F (1993) | 4.22 in (1998) |
| September 17 | 100.0°F (1980) | 46.0°F (1981) | 2.39 in (1974) |
| September 18 | 98.1°F (2005) | 41.0°F (1981) | 1.89 in (1995) |
| September 19 | 100.0°F (2005) | 42.1°F (1981) | 1.88 in (1983) |
| September 20 | 100.9°F (2005) | 46.0°F (1971) | 3.32 in (1979) |
| September 21 | 102.0°F (2005) | 43.0°F (1983) | 2.80 in (2013) |
| September 22 | 102.9°F (2005) | 41.0°F (1983) | 1.47 in (2020) |
| September 23 | 100.9°F (2005) | 41.0°F (1983) | 4.15 in (2018) |
| September 24 | 96.1°F (2000) | 41.0°F (1989) | 2.79 in (2018) |
| September 25 | 97.0°F (2022) | 41.0°F (1989) | 3.05 in (2000) |
| September 26 | 100.0°F (2005) | 43.0°F (1982) | 1.18 in (1970) |
| September 27 | 99.0°F (2005) | 43.0°F (2000) | 1.27 in (1976) |
| September 28 | 93.9°F (1977) | 39.0°F (1967) | 1.50 in (2020) |
| September 29 | 96.1°F (2005) | 37.9°F (1967) | 2.44 in (1980) |
| September 30 | 100.9°F (2011) | 39.0°F (1967) | 1.59 in (1972) |