September weather in St. Robert, MO
The average temperature in St. Robert in September is 68.8°F (56.4°F–81.3°F). Average precipitation: 4.18 inches.
September is a fall month in St. Robert, and is warmer than the annual average of 56.5°F. Daily temperatures swing about 24.9°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
81.3°F
Avg Low
56.4°F
Precipitation
4.18 in
Daylight
12h 14m
September records in St. Robert
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (2000) | 37.9°F (1967) | 2.35 in (1979) |
| September 2 | 102.0°F (1954) | 37.9°F (1949) | 1.70 in (1980) |
| September 3 | 102.9°F (1954) | 37.9°F (1952) | 1.67 in (2010) |
| September 4 | 104.0°F (1954) | 36.0°F (1974) | 5.25 in (2008) |
| September 5 | 102.0°F (1954) | 42.1°F (1953) | 3.00 in (1965) |
| September 6 | 100.9°F (1954) | 33.1°F (1988) | 2.64 in (1941) |
| September 7 | 98.1°F (1960) | 34.0°F (1988) | 2.80 in (2007) |
| September 8 | 100.0°F (1960) | 33.1°F (1956) | 2.45 in (1945) |
| September 9 | 99.0°F (1955) | 37.0°F (1956) | 3.14 in (1984) |
| September 10 | 98.1°F (1964) | 36.0°F (1976) | 1.82 in (2010) |
| September 11 | 100.0°F (1953) | 36.0°F (1959) | 1.70 in (1986) |
| September 12 | 100.0°F (1956) | 35.1°F (1955) | 0.96 in (1951) |
| September 13 | 98.1°F (1956) | 35.1°F (1960) | 2.55 in (1949) |
| September 14 | 99.0°F (1971) | 36.0°F (1960) | 4.50 in (2008) |
| September 15 | 100.0°F (1956) | 36.0°F (1979) | 1.77 in (1998) |
| September 16 | 99.0°F (1954) | 35.1°F (1961) | 2.87 in (1941) |
| September 17 | 99.0°F (1953) | 37.0°F (1951) | 2.51 in (2016) |
| September 18 | 99.0°F (2019) | 33.1°F (1981) | 1.64 in (1949) |
| September 19 | 102.0°F (1954) | 35.1°F (1981) | 1.36 in (1975) |
| September 20 | 102.9°F (1954) | 35.1°F (1962) | 1.74 in (1992) |
| September 21 | 97.0°F (2024) | 33.1°F (1983) | 1.65 in (1978) |
| September 22 | 98.1°F (2022) | 28.0°F (1953) | 1.63 in (2009) |
| September 23 | 95.0°F (2005) | 28.0°F (1995) | 3.38 in (1970) |
| September 24 | 95.0°F (2005) | 24.1°F (1989) | 2.58 in (2025) |
| September 25 | 91.0°F (2017) | 27.0°F (1989) | 3.95 in (1993) |
| September 26 | 93.9°F (1953) | 28.9°F (1985) | 1.23 in (1992) |
| September 27 | 96.1°F (1954) | 30.9°F (1989) | 2.89 in (1966) |
| September 28 | 104.0°F (1953) | 30.0°F (1989) | 2.00 in (1944) |
| September 29 | 102.9°F (1953) | 28.9°F (1949) | 1.71 in (1972) |
| September 30 | 93.9°F (1952) | 26.1°F (1984) | 3.05 in (1986) |