September weather in Rockton, IL
The average temperature in Rockton in September is 60.8°F (50.3°F–71.3°F). Average precipitation: 3.83 inches.
September is a fall month in Rockton, and is warmer than the annual average of 45.4°F. Daily temperatures swing about 21°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
71.3°F
Avg Low
50.3°F
Precipitation
3.83 in
Daylight
12h 16m
September records in Rockton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1953) | 41.0°F (1909) | 2.63 in (1989) |
| September 2 | 99.0°F (1953) | 39.9°F (1908) | 5.05 in (1942) |
| September 3 | 93.9°F (1953) | 44.1°F (1924) | 1.85 in (2002) |
| September 4 | 99.0°F (1925) | 39.0°F (1974) | 1.50 in (1973) |
| September 5 | 98.1°F (1922) | 42.1°F (1997) | 2.15 in (2008) |
| September 6 | 97.0°F (1939) | 37.9°F (1924) | 1.46 in (1938) |
| September 7 | 99.0°F (1922) | 39.0°F (1986) | 3.65 in (1894) |
| September 8 | 100.0°F (1922) | 39.0°F (1986) | 3.10 in (1941) |
| September 9 | 100.0°F (1922) | 39.9°F (1914) | 3.34 in (1938) |
| September 10 | 95.0°F (1931) | 37.0°F (1917) | 2.20 in (1965) |
| September 11 | 95.0°F (1931) | 35.1°F (1917) | 1.57 in (1925) |
| September 12 | 91.9°F (1908) | 36.0°F (1955) | 3.21 in (2019) |
| September 13 | 96.1°F (1939) | 37.0°F (1902) | 3.40 in (1961) |
| September 14 | 98.1°F (1939) | 32.0°F (1923) | 2.75 in (1896) |
| September 15 | 99.0°F (1939) | 37.0°F (1904) | 2.25 in (1912) |
| September 16 | 95.0°F (1939) | 32.0°F (1916) | 1.91 in (1936) |
| September 17 | 90.0°F (1908) | 37.0°F (1916) | 2.63 in (1992) |
| September 18 | 91.9°F (1955) | 32.0°F (1916) | 3.25 in (1972) |
| September 19 | 91.9°F (1895) | 34.0°F (1901) | 3.04 in (1950) |
| September 20 | 98.1°F (1919) | 30.0°F (1956) | 1.85 in (1997) |
| September 21 | 91.9°F (1908) | 37.0°F (1897) | 3.05 in (1947) |
| September 22 | 91.9°F (1895) | 32.0°F (1974) | 1.50 in (1970) |
| September 23 | 91.9°F (1937) | 30.0°F (1995) | 2.00 in (2000) |
| September 24 | 90.0°F (2017) | 30.0°F (1995) | 1.30 in (1899) |
| September 25 | 91.9°F (1920) | 28.0°F (1942) | 3.78 in (1984) |
| September 26 | 91.9°F (1920) | 28.0°F (1928) | 2.51 in (2005) |
| September 27 | 88.0°F (1954) | 30.0°F (1893) | 2.67 in (1902) |
| September 28 | 90.0°F (1952) | 26.1°F (1942) | 2.50 in (1999) |
| September 29 | 93.0°F (1953) | 30.0°F (1899) | 2.15 in (1906) |
| September 30 | 90.0°F (1971) | 23.0°F (1899) | 2.62 in (1911) |