September weather in Casey, IL
The average temperature in Casey in September is 68.1°F (55.4°F–80.8°F). Average precipitation: 3.07 inches.
September is a fall month in Casey, and is warmer than the annual average of 54.1°F. Daily temperatures swing about 25.4°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
80.8°F
Avg Low
55.4°F
Precipitation
3.07 in
Daylight
12h 15m
September records in Casey
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (1898) | 48.0°F (1893) | 3.62 in (2015) |
| September 2 | 97.0°F (1898) | 44.1°F (1909) | 1.76 in (1931) |
| September 3 | 98.1°F (1898) | 39.0°F (1908) | 3.27 in (1932) |
| September 4 | 93.0°F (1899) | 46.9°F (1902) | 2.81 in (1921) |
| September 5 | 99.0°F (1899) | 43.0°F (1902) | 1.56 in (1926) |
| September 6 | 99.0°F (1899) | 42.1°F (1988) | 1.70 in (1921) |
| September 7 | 98.1°F (1899) | 43.0°F (1988) | 1.45 in (1927) |
| September 8 | 95.0°F (1893) | 39.0°F (2024) | 2.06 in (1917) |
| September 9 | 98.1°F (1983) | 39.0°F (2024) | 3.01 in (1989) |
| September 10 | 97.0°F (1897) | 41.0°F (1902) | 2.57 in (1938) |
| September 11 | 98.1°F (1897) | 41.0°F (1902) | 2.38 in (2000) |
| September 12 | 99.0°F (1908) | 41.0°F (1902) | 1.72 in (1949) |
| September 13 | 96.1°F (1897) | 34.0°F (1902) | 1.40 in (1938) |
| September 14 | 95.0°F (1897) | 32.0°F (1902) | 3.86 in (1989) |
| September 15 | 97.0°F (1897) | 36.0°F (1902) | 2.24 in (1913) |
| September 16 | 95.0°F (1897) | 39.0°F (1984) | 2.00 in (1958) |
| September 17 | 95.0°F (1906) | 39.0°F (1900) | 1.54 in (1980) |
| September 18 | 96.1°F (1906) | 36.0°F (1903) | 1.32 in (1923) |
| September 19 | 93.0°F (1893) | 39.9°F (2020) | 1.45 in (1900) |
| September 20 | 98.1°F (1908) | 37.9°F (1896) | 0.90 in (1954) |
| September 21 | 95.0°F (1908) | 34.0°F (1897) | 2.10 in (1947) |
| September 22 | 95.0°F (2017) | 35.1°F (1983) | 1.79 in (1984) |
| September 23 | 95.0°F (2017) | 32.0°F (1983) | 1.17 in (1955) |
| September 24 | 93.9°F (1908) | 32.0°F (1983) | 1.11 in (1893) |
| September 25 | 93.0°F (2017) | 36.0°F (1907) | 2.11 in (2005) |
| September 26 | 93.0°F (1897) | 28.0°F (1907) | 2.50 in (1904) |
| September 27 | 93.9°F (1905) | 34.0°F (1899) | 1.05 in (1908) |
| September 28 | 93.9°F (1905) | 33.1°F (1909) | 2.12 in (1936) |
| September 29 | 93.0°F (1905) | 30.9°F (1899) | 1.91 in (1955) |
| September 30 | 91.9°F (2019) | 25.0°F (1899) | 3.00 in (1906) |