September weather in Delta, IA
The average temperature in Delta in September is 64.1°F (51.7°F–76.4°F). Average precipitation: 3.47 inches.
September is a fall month in Delta, and is warmer than the annual average of 48.9°F. Daily temperatures swing about 24.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.4°F
Avg Low
51.7°F
Precipitation
3.47 in
Daylight
12h 16m
September records in Delta
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1913) | 39.9°F (1949) | 2.55 in (1931) |
| September 2 | 99.0°F (1925) | 43.0°F (1946) | 1.32 in (1918) |
| September 3 | 100.0°F (1925) | 39.9°F (1974) | 1.45 in (1917) |
| September 4 | 102.0°F (1925) | 39.9°F (1974) | 1.49 in (1980) |
| September 5 | 102.0°F (1899) | 41.0°F (1962) | 2.08 in (1958) |
| September 6 | 102.9°F (1899) | 42.1°F (1962) | 2.56 in (1982) |
| September 7 | 102.0°F (1901) | 37.9°F (1898) | 1.08 in (1965) |
| September 8 | 99.0°F (1947) | 41.0°F (2025) | 1.64 in (1926) |
| September 9 | 100.0°F (1933) | 39.9°F (1924) | 2.66 in (1989) |
| September 10 | 100.9°F (2013) | 39.0°F (1910) | 3.52 in (1992) |
| September 11 | 100.0°F (1936) | 33.1°F (1917) | 1.49 in (1972) |
| September 12 | 97.0°F (1927) | 34.0°F (1902) | 1.56 in (1928) |
| September 13 | 98.1°F (1927) | 32.0°F (1902) | 2.00 in (1961) |
| September 14 | 99.0°F (1939) | 32.0°F (1923) | 2.22 in (1909) |
| September 15 | 99.0°F (1927) | 34.0°F (1916) | 2.07 in (1970) |
| September 16 | 95.0°F (1906) | 35.1°F (1937) | 2.12 in (1968) |
| September 17 | 98.1°F (1927) | 35.1°F (1900) | 1.65 in (1970) |
| September 18 | 95.0°F (1940) | 33.1°F (1916) | 1.82 in (1978) |
| September 19 | 96.1°F (1948) | 33.1°F (1991) | 2.54 in (1900) |
| September 20 | 95.0°F (1931) | 30.0°F (1896) | 2.60 in (1965) |
| September 21 | 96.1°F (1937) | 25.0°F (1913) | 2.05 in (1965) |
| September 22 | 99.0°F (1937) | 16.0°F (1913) | 1.45 in (2019) |
| September 23 | 93.9°F (2016) | 30.9°F (1995) | 2.31 in (2000) |
| September 24 | 93.0°F (1901) | 30.0°F (1942) | 1.30 in (1945) |
| September 25 | 91.0°F (1920) | 32.0°F (1907) | 1.75 in (2009) |
| September 26 | 91.0°F (1897) | 28.0°F (1928) | 1.95 in (1933) |
| September 27 | 89.1°F (1897) | 30.0°F (1942) | 1.91 in (1916) |
| September 28 | 98.1°F (1953) | 25.0°F (1942) | 1.85 in (1923) |
| September 29 | 93.0°F (1953) | 21.0°F (1899) | 3.13 in (1955) |
| September 30 | 91.9°F (1937) | 21.0°F (1899) | 2.28 in (1919) |