September weather in Westfield, IL
The average temperature in Westfield in September is 69.0°F (56.8°F–81.2°F). Average precipitation: 3.15 inches.
September is a fall month in Westfield, and is warmer than the annual average of 55°F. Daily temperatures swing about 24.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
81.2°F
Avg Low
56.8°F
Precipitation
3.15 in
Daylight
12h 15m
September records in Westfield
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (2011) | 43.0°F (1958) | 3.72 in (2003) |
| September 2 | 102.9°F (1953) | 43.0°F (1909) | 1.40 in (1934) |
| September 3 | 100.0°F (1925) | 39.0°F (1908) | 2.77 in (1993) |
| September 4 | 98.1°F (1925) | 42.1°F (1974) | 2.66 in (1918) |
| September 5 | 102.0°F (1954) | 41.0°F (1974) | 1.63 in (1994) |
| September 6 | 104.0°F (1925) | 41.0°F (1924) | 0.62 in (1971) |
| September 7 | 100.0°F (1933) | 37.0°F (1956) | 1.64 in (1934) |
| September 8 | 100.0°F (1922) | 37.0°F (1956) | 2.00 in (1926) |
| September 9 | 100.9°F (1933) | 42.1°F (1956) | 6.00 in (1926) |
| September 10 | 99.0°F (1919) | 37.0°F (1924) | 0.90 in (1911) |
| September 11 | 100.0°F (1933) | 35.1°F (1917) | 4.23 in (2000) |
| September 12 | 97.0°F (1908) | 35.1°F (1917) | 0.98 in (1949) |
| September 13 | 99.0°F (1939) | 36.0°F (1902) | 2.49 in (1911) |
| September 14 | 99.0°F (1939) | 32.0°F (1923) | 1.85 in (1989) |
| September 15 | 99.0°F (1927) | 39.0°F (2007) | 4.02 in (1931) |
| September 16 | 98.1°F (1927) | 30.9°F (1916) | 1.20 in (1958) |
| September 17 | 98.1°F (1927) | 33.1°F (1937) | 4.59 in (1969) |
| September 18 | 97.0°F (1953) | 34.0°F (1916) | 3.27 in (1923) |
| September 19 | 96.1°F (1925) | 36.0°F (1916) | 1.51 in (1966) |
| September 20 | 95.0°F (2017) | 30.9°F (1918) | 1.68 in (1986) |
| September 21 | 96.1°F (2017) | 34.0°F (1918) | 2.20 in (1947) |
| September 22 | 95.0°F (2005) | 34.0°F (1918) | 1.04 in (1965) |
| September 23 | 93.0°F (2010) | 32.0°F (1974) | 1.82 in (1970) |
| September 24 | 96.1°F (2017) | 30.0°F (1928) | 3.10 in (1902) |
| September 25 | 91.0°F (1908) | 34.0°F (1942) | 3.60 in (1961) |
| September 26 | 95.0°F (2017) | 27.0°F (1928) | 3.57 in (1904) |
| September 27 | 91.9°F (1998) | 32.0°F (1918) | 2.27 in (2003) |
| September 28 | 93.9°F (1953) | 26.1°F (1942) | 1.90 in (1936) |
| September 29 | 99.0°F (1953) | 32.0°F (1899) | 1.64 in (1987) |
| September 30 | 91.9°F (1933) | 25.0°F (1899) | 1.62 in (1927) |