September weather in Alton, IA
The average temperature in Alton in September is °F (°F–°F). Average precipitation: 2.92 inches.
September is a fall month in Alton, and is cooler than the annual average of 0°F. Expect about 7 days with precipitation. Daylight averages about 12h 17m.
Avg High
°F
Avg Low
°F
Precipitation
2.92 in
Daylight
12h 17m
September records in Alton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1913) | 45.0°F (1908) | 1.70 in (1933) |
| September 2 | 99.0°F (1925) | 39.9°F (1924) | 1.59 in (2008) |
| September 3 | 97.0°F (1925) | 39.9°F (1952) | 5.73 in (1970) |
| September 4 | 99.0°F (1913) | 35.1°F (1914) | 1.48 in (1980) |
| September 5 | 100.0°F (1913) | 35.1°F (1909) | 1.83 in (1985) |
| September 6 | 97.0°F (1913) | 39.0°F (1918) | 1.32 in (1965) |
| September 7 | 100.0°F (1931) | 37.9°F (1934) | 1.53 in (2007) |
| September 8 | 98.1°F (1947) | 37.0°F (1910) | 3.12 in (1964) |
| September 9 | 98.1°F (1931) | 37.9°F (1924) | 2.93 in (1951) |
| September 10 | 98.1°F (1931) | 37.0°F (1917) | 1.76 in (1916) |
| September 11 | 95.0°F (1939) | 37.9°F (1922) | 3.46 in (1949) |
| September 12 | 98.1°F (1939) | 33.1°F (1940) | 2.20 in (1909) |
| September 13 | 100.0°F (1939) | 36.0°F (1949) | 1.38 in (1938) |
| September 14 | 100.0°F (1939) | 35.1°F (1923) | 1.63 in (1978) |
| September 15 | 95.0°F (1939) | 30.9°F (1916) | 2.52 in (2004) |
| September 16 | 90.0°F (1948) | 32.0°F (1937) | 3.46 in (1906) |
| September 17 | 91.9°F (1908) | 28.9°F (1916) | 2.83 in (1987) |
| September 18 | 91.9°F (1947) | 28.9°F (1918) | 3.22 in (1926) |
| September 19 | 95.0°F (1948) | 32.0°F (1918) | 1.96 in (1923) |
| September 20 | 90.0°F (1940) | 27.0°F (1918) | 1.77 in (1923) |
| September 21 | 95.0°F (1937) | 30.9°F (1915) | 1.05 in (1980) |
| September 22 | 93.0°F (1936) | 19.9°F (1913) | 1.61 in (2006) |
| September 23 | 91.9°F (1938) | 28.9°F (1916) | 1.79 in (1968) |
| September 24 | 88.0°F (1935) | 28.0°F (1942) | 0.83 in (1937) |
| September 25 | 90.0°F (1920) | 27.0°F (1926) | 1.96 in (2005) |
| September 26 | 86.0°F (1938) | 28.9°F (1913) | 1.09 in (1910) |
| September 27 | 87.1°F (1952) | 26.1°F (1928) | 1.02 in (1946) |
| September 28 | 86.0°F (1952) | 23.0°F (1942) | 1.27 in (1988) |
| September 29 | 84.9°F (1952) | 25.0°F (1908) | 2.76 in (1923) |
| September 30 | 90.0°F (1952) | 25.0°F (1939) | 2.48 in (1965) |