September weather in Dedham, IA
The average temperature in Dedham in September is 64.0°F (51.8°F–76.3°F). Average precipitation: 2.95 inches.
September is a fall month in Dedham, and is warmer than the annual average of 48.3°F. Daily temperatures swing about 24.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.3°F
Avg Low
51.8°F
Precipitation
2.95 in
Daylight
12h 16m
September records in Dedham
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1897) | 34.0°F (1967) | 4.20 in (1926) |
| September 2 | 98.1°F (1897) | 43.0°F (1974) | 1.58 in (1936) |
| September 3 | 100.9°F (2000) | 28.0°F (1974) | 1.16 in (1949) |
| September 4 | 98.1°F (1925) | 37.0°F (1902) | 2.81 in (1989) |
| September 5 | 99.0°F (1925) | 33.1°F (1962) | 3.15 in (1936) |
| September 6 | 102.0°F (1939) | 34.0°F (1962) | 4.00 in (1938) |
| September 7 | 102.9°F (1939) | 34.0°F (1898) | 2.95 in (2015) |
| September 8 | 100.0°F (1947) | 37.0°F (1910) | 3.11 in (1989) |
| September 9 | 100.0°F (1955) | 37.9°F (1910) | 2.25 in (2020) |
| September 10 | 98.1°F (1933) | 35.1°F (1894) | 2.45 in (1914) |
| September 11 | 95.0°F (1927) | 28.9°F (1959) | 2.48 in (2006) |
| September 12 | 97.0°F (1897) | 28.9°F (1902) | 1.59 in (1909) |
| September 13 | 98.1°F (1939) | 30.0°F (1902) | 4.40 in (1978) |
| September 14 | 100.0°F (1939) | 34.0°F (1923) | 1.71 in (1914) |
| September 15 | 99.0°F (1939) | 28.9°F (1966) | 1.98 in (1941) |
| September 16 | 98.1°F (1931) | 27.0°F (1966) | 2.64 in (2016) |
| September 17 | 95.0°F (1895) | 30.9°F (1901) | 1.62 in (2015) |
| September 18 | 96.1°F (1947) | 28.9°F (1901) | 1.52 in (1900) |
| September 19 | 99.0°F (1948) | 28.9°F (1896) | 4.90 in (1926) |
| September 20 | 91.0°F (1998) | 27.0°F (1918) | 1.21 in (2023) |
| September 21 | 97.0°F (2022) | 28.9°F (1918) | 1.26 in (2018) |
| September 22 | 97.0°F (1937) | 25.0°F (1953) | 1.32 in (1910) |
| September 23 | 93.0°F (1938) | 25.0°F (1983) | 1.80 in (1902) |
| September 24 | 91.0°F (2017) | 28.0°F (1942) | 0.95 in (1913) |
| September 25 | 91.9°F (1897) | 23.0°F (1893) | 2.07 in (1931) |
| September 26 | 90.0°F (1990) | 28.0°F (1899) | 4.85 in (1973) |
| September 27 | 91.0°F (1998) | 28.9°F (1912) | 1.72 in (1916) |
| September 28 | 95.0°F (1953) | 21.9°F (1942) | 4.04 in (1988) |
| September 29 | 91.0°F (2021) | 19.0°F (1899) | 1.60 in (1901) |
| September 30 | 91.9°F (2023) | 24.1°F (1895) | 2.48 in (1919) |