September weather in Marengo, IL
The average temperature in Marengo in September is 63.6°F (51.8°F–75.4°F). Average precipitation: 3.68 inches.
September is a fall month in Marengo, and is warmer than the annual average of 48.2°F. Daily temperatures swing about 23.6°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
75.4°F
Avg Low
51.8°F
Precipitation
3.68 in
Daylight
12h 16m
September records in Marengo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1953) | 37.9°F (1967) | 2.51 in (1989) |
| September 2 | 99.0°F (1922) | 36.0°F (1946) | 5.14 in (2018) |
| September 3 | 96.1°F (1939) | 41.0°F (1974) | 2.89 in (2018) |
| September 4 | 100.9°F (1925) | 39.9°F (1997) | 1.30 in (1973) |
| September 5 | 98.1°F (1899) | 39.0°F (1962) | 1.33 in (1910) |
| September 6 | 102.0°F (1922) | 34.0°F (1962) | 2.15 in (1970) |
| September 7 | 100.9°F (1922) | 36.0°F (1986) | 9.02 in (1894) |
| September 8 | 102.9°F (1922) | 36.0°F (1986) | 1.43 in (2016) |
| September 9 | 95.0°F (1897) | 36.0°F (1986) | 3.04 in (1938) |
| September 10 | 95.0°F (1897) | 36.0°F (1917) | 1.50 in (1922) |
| September 11 | 93.9°F (1931) | 34.0°F (1917) | 2.23 in (1925) |
| September 12 | 93.9°F (1939) | 36.0°F (1993) | 1.18 in (2015) |
| September 13 | 98.1°F (1939) | 33.1°F (1964) | 1.94 in (1936) |
| September 14 | 100.0°F (1939) | 33.1°F (1923) | 3.20 in (1978) |
| September 15 | 100.9°F (1939) | 34.0°F (2007) | 2.56 in (1894) |
| September 16 | 91.9°F (1899) | 30.9°F (1916) | 1.42 in (1929) |
| September 17 | 91.0°F (1906) | 33.1°F (1937) | 2.50 in (1972) |
| September 18 | 93.0°F (1988) | 30.0°F (1959) | 1.73 in (1927) |
| September 19 | 91.0°F (1908) | 34.0°F (1929) | 2.48 in (1950) |
| September 20 | 91.9°F (1947) | 27.0°F (1956) | 2.29 in (1950) |
| September 21 | 91.0°F (1893) | 30.9°F (1962) | 2.74 in (1893) |
| September 22 | 93.0°F (2017) | 28.0°F (1974) | 1.75 in (1926) |
| September 23 | 95.0°F (2017) | 25.0°F (1974) | 1.12 in (1964) |
| September 24 | 95.0°F (2017) | 27.0°F (1976) | 0.91 in (1926) |
| September 25 | 91.0°F (1920) | 25.0°F (1942) | 3.34 in (1986) |
| September 26 | 90.0°F (1920) | 28.9°F (1926) | 2.85 in (1930) |
| September 27 | 91.9°F (2017) | 28.9°F (1991) | 2.28 in (2011) |
| September 28 | 90.0°F (1905) | 25.0°F (1942) | 1.64 in (1959) |
| September 29 | 93.9°F (1953) | 28.0°F (1949) | 2.08 in (1906) |
| September 30 | 91.9°F (1971) | 24.1°F (1899) | 1.64 in (1896) |