September weather in Clayton, MO
The average temperature in Clayton in September is 71.6°F (61.7°F–81.5°F). Average precipitation: 3.41 inches.
September is a fall month in Clayton, and is warmer than the annual average of 58°F. Daily temperatures swing about 19.8°F between overnight low and afternoon high. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
81.5°F
Avg Low
61.7°F
Precipitation
3.41 in
Daylight
12h 14m
September records in Clayton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (2011) | 52.0°F (2009) | 2.31 in (2012) |
| September 2 | 104.0°F (2011) | 53.1°F (1974) | 2.96 in (2003) |
| September 3 | 102.0°F (2011) | 50.0°F (1974) | 1.36 in (1993) |
| September 4 | 100.0°F (2011) | 50.0°F (1974) | 3.52 in (2008) |
| September 5 | 97.0°F (1990) | 51.1°F (1997) | 1.00 in (2009) |
| September 6 | 99.0°F (1990) | 48.0°F (1988) | 0.43 in (1977) |
| September 7 | 99.0°F (1990) | 52.0°F (1988) | 0.53 in (2012) |
| September 8 | 98.1°F (1970) | 52.0°F (2011) | 2.10 in (2018) |
| September 9 | 95.0°F (1971) | 54.0°F (1998) | 2.20 in (2016) |
| September 10 | 96.1°F (1971) | 54.0°F (1969) | 2.40 in (2016) |
| September 11 | 100.0°F (2013) | 51.1°F (1992) | 0.91 in (2010) |
| September 12 | 98.1°F (2013) | 53.1°F (1968) | 0.89 in (2008) |
| September 13 | 93.0°F (1971) | 45.0°F (2014) | 0.54 in (1999) |
| September 14 | 99.0°F (1971) | 46.0°F (2014) | 4.50 in (2008) |
| September 15 | 93.0°F (1994) | 46.0°F (2011) | 1.77 in (2005) |
| September 16 | 91.0°F (2016) | 51.1°F (1993) | 1.66 in (2016) |
| September 17 | 93.0°F (1997) | 48.9°F (1999) | 2.05 in (1969) |
| September 18 | 91.9°F (1988) | 45.0°F (1973) | 1.46 in (1968) |
| September 19 | 93.9°F (1972) | 48.0°F (2012) | 1.57 in (2001) |
| September 20 | 95.0°F (2017) | 44.1°F (2006) | 1.52 in (2005) |
| September 21 | 93.9°F (2017) | 43.0°F (1974) | 0.96 in (2018) |
| September 22 | 91.0°F (2010) | 39.9°F (1995) | 0.54 in (2009) |
| September 23 | 95.0°F (2005) | 37.9°F (1995) | 3.02 in (1993) |
| September 24 | 93.9°F (2007) | 37.9°F (1995) | 1.31 in (1996) |
| September 25 | 91.0°F (2016) | 35.1°F (1969) | 1.14 in (2000) |
| September 26 | 91.9°F (2017) | 46.9°F (1975) | 1.65 in (1977) |
| September 27 | 91.0°F (1998) | 45.0°F (1989) | 1.53 in (2003) |
| September 28 | 91.9°F (1971) | 43.0°F (1989) | 0.63 in (2020) |
| September 29 | 93.0°F (1971) | 42.1°F (2003) | 1.41 in (1974) |
| September 30 | 91.9°F (1971) | 41.0°F (1992) | 0.58 in (2008) |