September weather in St. John, KS
The average temperature in St. John in September is 70.6°F (57.6°F–83.7°F). Average precipitation: 1.94 inches.
September is a fall month in St. John, and is warmer than the annual average of 56.4°F. Daily temperatures swing about 26.1°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
83.7°F
Avg Low
57.6°F
Precipitation
1.94 in
Daylight
12h 14m
September records in St. John
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 107.1°F (2011) | 48.0°F (1956) | 3.10 in (1969) |
| September 2 | 107.1°F (2000) | 45.0°F (1952) | 1.87 in (1938) |
| September 3 | 104.0°F (2012) | 42.1°F (1974) | 1.62 in (2018) |
| September 4 | 105.1°F (2012) | 46.9°F (1974) | 2.50 in (1926) |
| September 5 | 102.0°F (1976) | 46.9°F (1962) | 1.56 in (1930) |
| September 6 | 106.0°F (2011) | 46.0°F (2017) | 0.90 in (2008) |
| September 7 | 104.0°F (1998) | 43.0°F (1956) | 1.20 in (1929) |
| September 8 | 105.1°F (2015) | 45.0°F (1956) | 0.66 in (1948) |
| September 9 | 100.9°F (2013) | 42.1°F (2020) | 1.24 in (1954) |
| September 10 | 104.0°F (1984) | 41.0°F (1962) | 1.49 in (1937) |
| September 11 | 104.0°F (2000) | 43.0°F (1959) | 2.20 in (1957) |
| September 12 | 104.0°F (2021) | 43.0°F (1959) | 1.17 in (1933) |
| September 13 | 100.0°F (1956) | 35.1°F (2014) | 3.40 in (1977) |
| September 14 | 97.0°F (1955) | 36.0°F (2014) | 1.86 in (1957) |
| September 15 | 96.1°F (2017) | 37.0°F (1961) | 2.05 in (2002) |
| September 16 | 98.1°F (1952) | 42.1°F (1951) | 1.46 in (2013) |
| September 17 | 100.0°F (1953) | 37.0°F (1980) | 1.47 in (1958) |
| September 18 | 100.0°F (1954) | 41.0°F (1973) | 2.55 in (1990) |
| September 19 | 100.9°F (2022) | 37.9°F (2003) | 2.83 in (1967) |
| September 20 | 100.0°F (2016) | 39.0°F (1983) | 2.17 in (1978) |
| September 21 | 100.0°F (1956) | 30.9°F (1983) | 1.36 in (1958) |
| September 22 | 99.0°F (2017) | 30.9°F (1995) | 1.53 in (1955) |
| September 23 | 99.0°F (1984) | 35.1°F (1983) | 1.76 in (1976) |
| September 24 | 96.1°F (1984) | 37.0°F (1989) | 0.61 in (1988) |
| September 25 | 97.0°F (1998) | 34.0°F (2000) | 1.38 in (1935) |
| September 26 | 98.1°F (2020) | 34.0°F (2000) | 7.77 in (1973) |
| September 27 | 97.0°F (2020) | 35.1°F (1984) | 2.81 in (1944) |
| September 28 | 102.9°F (1953) | 37.0°F (1976) | 1.55 in (1945) |
| September 29 | 97.0°F (1994) | 34.0°F (1985) | 1.44 in (1931) |
| September 30 | 97.0°F (1994) | 28.0°F (1984) | 0.99 in (2021) |