September weather in Bonaparte, IA
The average temperature in Bonaparte in September is 65.3°F (53.2°F–77.5°F). Average precipitation: 3.69 inches.
September is a fall month in Bonaparte, and is warmer than the annual average of 50.6°F. Daily temperatures swing about 24.3°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
77.5°F
Avg Low
53.2°F
Precipitation
3.69 in
Daylight
12h 15m
September records in Bonaparte
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (1913) | 39.9°F (1915) | 1.75 in (2003) |
| September 2 | 100.9°F (2000) | 43.0°F (1915) | 1.49 in (1934) |
| September 3 | 102.0°F (1913) | 41.0°F (1952) | 1.80 in (1926) |
| September 4 | 100.0°F (1913) | 37.0°F (1974) | 1.86 in (1926) |
| September 5 | 100.0°F (1899) | 37.9°F (1974) | 2.40 in (1898) |
| September 6 | 100.9°F (1936) | 37.9°F (1962) | 2.40 in (2018) |
| September 7 | 100.9°F (1939) | 37.9°F (1956) | 2.53 in (1995) |
| September 8 | 102.0°F (1947) | 35.1°F (1986) | 2.25 in (1894) |
| September 9 | 102.0°F (1947) | 41.0°F (2024) | 1.86 in (1989) |
| September 10 | 100.9°F (2013) | 37.0°F (1910) | 4.15 in (2014) |
| September 11 | 102.0°F (1936) | 30.9°F (1917) | 3.50 in (1925) |
| September 12 | 98.1°F (1939) | 35.1°F (1955) | 4.80 in (1928) |
| September 13 | 99.0°F (1939) | 32.0°F (1902) | 7.15 in (1961) |
| September 14 | 100.0°F (1939) | 30.0°F (1923) | 2.65 in (1993) |
| September 15 | 100.9°F (1939) | 35.1°F (1904) | 1.10 in (1911) |
| September 16 | 93.9°F (1931) | 32.0°F (1984) | 3.00 in (1896) |
| September 17 | 99.0°F (1927) | 34.0°F (1937) | 1.56 in (1968) |
| September 18 | 100.0°F (1895) | 28.0°F (1916) | 3.50 in (1978) |
| September 19 | 93.9°F (1947) | 28.9°F (1916) | 2.23 in (2001) |
| September 20 | 93.9°F (1931) | 28.9°F (1991) | 2.30 in (1965) |
| September 21 | 95.0°F (2022) | 28.9°F (1918) | 1.77 in (1965) |
| September 22 | 97.0°F (1937) | 26.1°F (1913) | 2.68 in (1970) |
| September 23 | 91.9°F (2017) | 27.0°F (1983) | 5.09 in (1959) |
| September 24 | 93.0°F (2017) | 30.9°F (1989) | 1.85 in (1986) |
| September 25 | 93.0°F (1920) | 30.9°F (1928) | 2.63 in (1976) |
| September 26 | 93.9°F (1897) | 27.0°F (1926) | 2.00 in (1981) |
| September 27 | 91.9°F (1990) | 28.9°F (1918) | 2.60 in (1973) |
| September 28 | 100.0°F (1953) | 26.1°F (1942) | 3.05 in (1999) |
| September 29 | 96.1°F (1953) | 23.0°F (1984) | 1.68 in (1911) |
| September 30 | 91.9°F (1952) | 24.1°F (1899) | 1.85 in (2019) |