September weather in Arrowsmith, IL
The average temperature in Arrowsmith in September is 65.5°F (53.2°F–77.8°F). Average precipitation: 3.20 inches.
September is a fall month in Arrowsmith, and is warmer than the annual average of 50.7°F. Daily temperatures swing about 24.6°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
77.8°F
Avg Low
53.2°F
Precipitation
3.20 in
Daylight
12h 15m
September records in Arrowsmith
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2000) | 48.0°F (1986) | 3.04 in (1989) |
| September 2 | 96.1°F (1984) | 46.0°F (1987) | 1.21 in (1936) |
| September 3 | 96.1°F (2000) | 46.0°F (1987) | 2.26 in (1993) |
| September 4 | 93.9°F (2000) | 42.1°F (1982) | 1.50 in (1961) |
| September 5 | 93.9°F (1999) | 45.0°F (1988) | 1.85 in (1949) |
| September 6 | 95.0°F (1990) | 39.0°F (1988) | 2.11 in (2006) |
| September 7 | 96.1°F (1990) | 41.0°F (1988) | 0.97 in (2001) |
| September 8 | 93.9°F (1990) | 35.1°F (1986) | 0.54 in (1970) |
| September 9 | 91.9°F (1985) | 37.9°F (1986) | 1.44 in (1989) |
| September 10 | 95.0°F (1983) | 43.0°F (1999) | 1.46 in (1992) |
| September 11 | 95.0°F (1983) | 41.0°F (1993) | 0.63 in (1964) |
| September 12 | 91.9°F (2005) | 43.0°F (1993) | 1.66 in (2000) |
| September 13 | 93.9°F (1991) | 39.0°F (1985) | 3.04 in (1977) |
| September 14 | 95.0°F (1991) | 39.9°F (1985) | 2.37 in (1972) |
| September 15 | 93.0°F (1991) | 37.0°F (2007) | 2.53 in (1965) |
| September 16 | 93.0°F (1991) | 37.0°F (1984) | 1.85 in (1965) |
| September 17 | 86.0°F (1994) | 39.0°F (1984) | 3.12 in (1960) |
| September 18 | 86.0°F (2006) | 39.0°F (1981) | 1.56 in (1952) |
| September 19 | 91.9°F (1983) | 37.0°F (1991) | 1.75 in (1966) |
| September 20 | 90.0°F (2005) | 32.0°F (1991) | 1.75 in (1945) |
| September 21 | 90.0°F (1984) | 33.1°F (1991) | 2.06 in (1950) |
| September 22 | 90.0°F (1986) | 30.9°F (1983) | 2.99 in (1970) |
| September 23 | 91.9°F (2005) | 27.0°F (1995) | 1.41 in (1968) |
| September 24 | 91.0°F (2007) | 28.9°F (1989) | 2.30 in (1961) |
| September 25 | 91.0°F (2007) | 32.0°F (1989) | 1.78 in (2005) |
| September 26 | 89.1°F (1999) | 32.0°F (1989) | 1.04 in (1935) |
| September 27 | 90.0°F (1998) | 33.1°F (1991) | 1.57 in (1936) |
| September 28 | 91.0°F (1998) | 33.1°F (1989) | 1.50 in (1945) |
| September 29 | 88.0°F (1986) | 33.1°F (1984) | 2.46 in (1959) |
| September 30 | 84.9°F (1982) | 30.0°F (1984) | 0.81 in (1965) |