September weather in La Harpe, IL
The average temperature in La Harpe in September is 65.3°F (54.0°F–76.7°F). Average precipitation: 3.83 inches.
September is a fall month in La Harpe, and is warmer than the annual average of 50.8°F. Daily temperatures swing about 22.7°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
76.7°F
Avg Low
54.0°F
Precipitation
3.83 in
Daylight
12h 15m
September records in La Harpe
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (1913) | 39.9°F (1949) | 2.46 in (1931) |
| September 2 | 102.0°F (1913) | 42.1°F (1946) | 1.25 in (1935) |
| September 3 | 102.0°F (1913) | 42.1°F (1952) | 2.60 in (1926) |
| September 4 | 100.0°F (1925) | 37.0°F (1974) | 1.32 in (1917) |
| September 5 | 100.9°F (1899) | 42.1°F (1962) | 3.65 in (1971) |
| September 6 | 102.0°F (1925) | 39.0°F (1988) | 2.68 in (2018) |
| September 7 | 100.0°F (1922) | 39.0°F (1956) | 3.18 in (1941) |
| September 8 | 100.0°F (1897) | 37.9°F (1988) | 2.47 in (1926) |
| September 9 | 99.0°F (1912) | 39.9°F (1943) | 1.64 in (1941) |
| September 10 | 100.0°F (1897) | 36.0°F (1976) | 5.48 in (2014) |
| September 11 | 97.0°F (1933) | 34.0°F (1917) | 2.11 in (1925) |
| September 12 | 100.0°F (1897) | 35.1°F (1940) | 4.50 in (1928) |
| September 13 | 98.1°F (1939) | 30.9°F (1902) | 4.15 in (1961) |
| September 14 | 100.9°F (1939) | 34.0°F (1923) | 3.42 in (1972) |
| September 15 | 100.0°F (1939) | 35.1°F (1904) | 2.54 in (1967) |
| September 16 | 96.1°F (1906) | 34.0°F (2007) | 4.34 in (2004) |
| September 17 | 97.0°F (1927) | 34.0°F (2007) | 2.48 in (1980) |
| September 18 | 96.1°F (1895) | 32.0°F (1916) | 3.00 in (1904) |
| September 19 | 96.1°F (1895) | 35.1°F (1938) | 1.40 in (2015) |
| September 20 | 95.0°F (1940) | 32.0°F (1896) | 2.54 in (1950) |
| September 21 | 93.9°F (1895) | 32.0°F (1918) | 4.34 in (1947) |
| September 22 | 93.9°F (1930) | 30.0°F (1913) | 3.42 in (1970) |
| September 23 | 93.9°F (2017) | 28.9°F (1974) | 3.26 in (1961) |
| September 24 | 93.0°F (2017) | 30.9°F (1995) | 1.74 in (1911) |
| September 25 | 91.0°F (1908) | 32.0°F (1907) | 2.50 in (1930) |
| September 26 | 93.9°F (1897) | 28.9°F (1928) | 2.65 in (1936) |
| September 27 | 91.9°F (1905) | 32.0°F (1918) | 3.00 in (1904) |
| September 28 | 96.1°F (1953) | 25.0°F (1942) | 3.48 in (1999) |
| September 29 | 100.0°F (1953) | 28.9°F (1899) | 1.75 in (1911) |
| September 30 | 91.0°F (1933) | 23.0°F (1899) | 2.64 in (1986) |