September weather in Keokuk, IA
The average temperature in Keokuk in September is 66.8°F (56.3°F–77.4°F). Average precipitation: 3.42 inches.
September is a fall month in Keokuk, and is warmer than the annual average of 52.1°F. Daily temperatures swing about 21.1°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
77.4°F
Avg Low
56.3°F
Precipitation
3.42 in
Daylight
12h 15m
September records in Keokuk
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1953) | 48.0°F (1967) | 2.76 in (1931) |
| September 2 | 102.0°F (2011) | 52.0°F (1967) | 1.38 in (1959) |
| September 3 | 100.9°F (2011) | 45.0°F (1974) | 2.55 in (1917) |
| September 4 | 96.1°F (1960) | 43.0°F (1974) | 2.13 in (1926) |
| September 5 | 98.1°F (1990) | 45.0°F (1988) | 2.89 in (1898) |
| September 6 | 98.1°F (1936) | 46.0°F (1962) | 1.94 in (1898) |
| September 7 | 100.0°F (1990) | 45.0°F (1956) | 1.72 in (1995) |
| September 8 | 96.1°F (2013) | 43.0°F (1986) | 2.88 in (1899) |
| September 9 | 97.0°F (1933) | 46.9°F (2008) | 2.10 in (1926) |
| September 10 | 102.0°F (2013) | 44.1°F (1976) | 4.67 in (2014) |
| September 11 | 100.0°F (1936) | 42.1°F (1940) | 3.04 in (1915) |
| September 12 | 97.0°F (2013) | 44.1°F (1940) | 2.45 in (1928) |
| September 13 | 96.1°F (1939) | 39.9°F (2014) | 2.32 in (1970) |
| September 14 | 98.1°F (1939) | 41.0°F (1974) | 4.82 in (1961) |
| September 15 | 100.0°F (1939) | 41.0°F (1961) | 2.05 in (1931) |
| September 16 | 91.9°F (1956) | 41.0°F (1937) | 2.03 in (1965) |
| September 17 | 95.0°F (1997) | 43.0°F (2011) | 2.94 in (1896) |
| September 18 | 93.9°F (1953) | 39.9°F (1981) | 2.32 in (2022) |
| September 19 | 91.9°F (1940) | 37.0°F (1991) | 3.01 in (1904) |
| September 20 | 93.0°F (1940) | 37.9°F (1991) | 2.60 in (1926) |
| September 21 | 93.9°F (2022) | 37.0°F (1983) | 1.74 in (1957) |
| September 22 | 93.0°F (1937) | 36.0°F (1995) | 4.08 in (1970) |
| September 23 | 91.9°F (1988) | 30.0°F (1992) | 1.00 in (1986) |
| September 24 | 93.0°F (2017) | 32.0°F (1992) | 2.78 in (1961) |
| September 25 | 91.0°F (2017) | 37.0°F (1989) | 2.64 in (1911) |
| September 26 | 91.0°F (1953) | 33.1°F (1991) | 4.37 in (1936) |
| September 27 | 89.1°F (1971) | 37.9°F (1934) | 1.90 in (1904) |
| September 28 | 97.0°F (1953) | 35.1°F (1951) | 3.74 in (1999) |
| September 29 | 98.1°F (1953) | 32.0°F (1984) | 2.04 in (1906) |
| September 30 | 90.0°F (1933) | 35.1°F (1984) | 2.70 in (1986) |