September weather in Rockford, IA
The average temperature in Rockford in September is 62.4°F (51.3°F–73.4°F). Average precipitation: 3.82 inches.
September is a fall month in Rockford, and is warmer than the annual average of 46.5°F. Daily temperatures swing about 22.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
73.4°F
Avg Low
51.3°F
Precipitation
3.82 in
Daylight
12h 17m
September records in Rockford
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1953) | 37.9°F (1949) | 1.82 in (1969) |
| September 2 | 95.0°F (1898) | 37.9°F (1893) | 1.54 in (1959) |
| September 3 | 96.1°F (2023) | 35.1°F (1974) | 1.38 in (1992) |
| September 4 | 95.0°F (2012) | 36.0°F (1974) | 1.30 in (2011) |
| September 5 | 91.9°F (1900) | 39.0°F (1962) | 2.98 in (1985) |
| September 6 | 91.9°F (1978) | 37.0°F (1988) | 3.12 in (1894) |
| September 7 | 97.0°F (1978) | 37.0°F (1956) | 1.94 in (1965) |
| September 8 | 96.1°F (1978) | 37.9°F (1986) | 4.04 in (1964) |
| September 9 | 99.0°F (1955) | 36.0°F (1988) | 1.51 in (2020) |
| September 10 | 93.0°F (1955) | 39.0°F (1976) | 3.35 in (2016) |
| September 11 | 96.1°F (2000) | 33.1°F (1898) | 2.66 in (2006) |
| September 12 | 93.0°F (1998) | 32.0°F (1955) | 0.73 in (1991) |
| September 13 | 91.9°F (1897) | 33.1°F (2014) | 2.40 in (1978) |
| September 14 | 91.0°F (1994) | 36.0°F (1949) | 1.02 in (2004) |
| September 15 | 93.9°F (1955) | 28.9°F (2007) | 1.36 in (1992) |
| September 16 | 93.0°F (1955) | 35.1°F (1984) | 1.74 in (2016) |
| September 17 | 95.0°F (1988) | 35.1°F (1900) | 1.02 in (1965) |
| September 18 | 93.9°F (1955) | 32.0°F (1894) | 1.21 in (2025) |
| September 19 | 93.0°F (1948) | 32.0°F (1991) | 2.44 in (2019) |
| September 20 | 91.0°F (2022) | 28.0°F (1991) | 3.02 in (1983) |
| September 21 | 91.0°F (2024) | 28.9°F (1999) | 1.37 in (2001) |
| September 22 | 91.0°F (2017) | 25.0°F (1974) | 6.35 in (2016) |
| September 23 | 91.0°F (2017) | 27.0°F (2012) | 2.30 in (2016) |
| September 24 | 90.0°F (2017) | 28.0°F (1989) | 1.40 in (1977) |
| September 25 | 87.1°F (1956) | 28.0°F (1893) | 5.18 in (1972) |
| September 26 | 87.1°F (1986) | 26.1°F (1984) | 2.45 in (1972) |
| September 27 | 84.9°F (1894) | 28.0°F (1893) | 0.75 in (1959) |
| September 28 | 90.0°F (1898) | 27.0°F (1961) | 1.60 in (1901) |
| September 29 | 88.0°F (1898) | 26.1°F (1967) | 2.35 in (1973) |
| September 30 | 91.0°F (2023) | 19.0°F (1899) | 1.43 in (1954) |