September weather in Stockton, IL
The average temperature in Stockton in September is 62.7°F (51.2°F–74.2°F). Average precipitation: 4.22 inches.
September is a fall month in Stockton, and is warmer than the annual average of 47.9°F. Daily temperatures swing about 23°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
74.2°F
Avg Low
51.2°F
Precipitation
4.22 in
Daylight
12h 16m
September records in Stockton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1953) | 39.9°F (1949) | 2.49 in (1989) |
| September 2 | 96.1°F (1953) | 39.9°F (1946) | 5.66 in (2018) |
| September 3 | 91.0°F (1960) | 39.9°F (1987) | 2.25 in (2019) |
| September 4 | 91.9°F (2012) | 39.0°F (1997) | 1.52 in (2006) |
| September 5 | 91.9°F (1954) | 39.9°F (1962) | 0.97 in (1971) |
| September 6 | 91.9°F (1954) | 33.1°F (1988) | 1.26 in (2020) |
| September 7 | 93.0°F (1959) | 33.1°F (1988) | 1.68 in (2001) |
| September 8 | 93.9°F (1978) | 37.9°F (2024) | 2.24 in (2020) |
| September 9 | 96.1°F (1955) | 39.9°F (1949) | 1.31 in (1985) |
| September 10 | 93.9°F (2013) | 39.9°F (1967) | 2.59 in (2019) |
| September 11 | 93.0°F (1983) | 35.1°F (1955) | 2.47 in (2000) |
| September 12 | 91.9°F (1952) | 33.1°F (1955) | 2.15 in (1961) |
| September 13 | 90.0°F (1998) | 34.0°F (1953) | 4.36 in (1961) |
| September 14 | 88.0°F (2018) | 34.0°F (2014) | 3.05 in (1998) |
| September 15 | 89.1°F (1955) | 33.1°F (2007) | 1.62 in (1970) |
| September 16 | 89.1°F (1955) | 30.9°F (1984) | 1.52 in (1997) |
| September 17 | 90.0°F (2018) | 33.1°F (1984) | 1.08 in (1970) |
| September 18 | 91.0°F (1988) | 37.0°F (1991) | 2.78 in (1978) |
| September 19 | 91.9°F (1948) | 28.9°F (1991) | 3.57 in (2001) |
| September 20 | 93.0°F (2022) | 30.0°F (1956) | 3.25 in (1965) |
| September 21 | 88.0°F (2005) | 32.0°F (1947) | 2.95 in (1950) |
| September 22 | 93.9°F (2017) | 28.0°F (1974) | 2.95 in (2000) |
| September 23 | 93.9°F (2017) | 28.0°F (1995) | 2.09 in (1959) |
| September 24 | 89.1°F (2007) | 28.9°F (1989) | 2.04 in (1960) |
| September 25 | 91.0°F (2017) | 33.1°F (2001) | 2.17 in (1986) |
| September 26 | 89.1°F (1998) | 30.0°F (1991) | 2.30 in (1993) |
| September 27 | 88.0°F (2021) | 27.0°F (1991) | 1.16 in (1999) |
| September 28 | 90.0°F (1952) | 30.9°F (1957) | 2.31 in (1945) |
| September 29 | 93.9°F (1953) | 26.1°F (1949) | 1.75 in (1986) |
| September 30 | 88.0°F (2021) | 27.0°F (1984) | 0.92 in (1961) |