September weather in Spencer, IA
The average temperature in Spencer in September is 62.4°F (50.2°F–74.6°F). Average precipitation: 3.29 inches.
September is a fall month in Spencer, and is warmer than the annual average of 46.1°F. Daily temperatures swing about 24.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
74.6°F
Avg Low
50.2°F
Precipitation
3.29 in
Daylight
12h 17m
September records in Spencer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1911) | 33.1°F (1949) | 1.12 in (1957) |
| September 2 | 102.0°F (1925) | 37.0°F (1946) | 1.56 in (1933) |
| September 3 | 102.0°F (1925) | 30.9°F (1974) | 1.30 in (1989) |
| September 4 | 100.9°F (1925) | 36.0°F (1974) | 2.31 in (2018) |
| September 5 | 98.1°F (1913) | 35.1°F (1962) | 2.51 in (1938) |
| September 6 | 99.0°F (1922) | 36.0°F (1956) | 3.53 in (1938) |
| September 7 | 98.1°F (1931) | 35.1°F (1956) | 5.01 in (1964) |
| September 8 | 99.0°F (1947) | 36.0°F (1986) | 2.65 in (1941) |
| September 9 | 97.0°F (1931) | 35.1°F (1924) | 1.10 in (1911) |
| September 10 | 99.0°F (1931) | 33.1°F (1948) | 2.31 in (1949) |
| September 11 | 93.9°F (1895) | 32.0°F (1955) | 1.46 in (1938) |
| September 12 | 98.1°F (1939) | 30.9°F (1940) | 2.23 in (1982) |
| September 13 | 100.0°F (1939) | 30.9°F (2014) | 1.53 in (1938) |
| September 14 | 99.0°F (1939) | 30.9°F (1949) | 4.58 in (2004) |
| September 15 | 99.0°F (1939) | 28.0°F (2007) | 2.55 in (2004) |
| September 16 | 93.9°F (1955) | 30.0°F (1934) | 1.85 in (1921) |
| September 17 | 99.0°F (1895) | 30.0°F (1897) | 2.97 in (2004) |
| September 18 | 93.9°F (1920) | 26.1°F (1929) | 4.90 in (1926) |
| September 19 | 96.1°F (1895) | 27.0°F (1991) | 2.98 in (2018) |
| September 20 | 98.1°F (2022) | 27.0°F (1897) | 3.93 in (2018) |
| September 21 | 97.0°F (1937) | 28.0°F (1999) | 2.34 in (2004) |
| September 22 | 95.0°F (1936) | 23.0°F (1913) | 2.03 in (1895) |
| September 23 | 91.9°F (1938) | 28.0°F (1928) | 1.50 in (1926) |
| September 24 | 90.0°F (1935) | 28.0°F (1942) | 1.97 in (1931) |
| September 25 | 91.0°F (1956) | 27.0°F (1926) | 2.66 in (2005) |
| September 26 | 91.0°F (1956) | 24.1°F (1984) | 1.13 in (1973) |
| September 27 | 91.0°F (1956) | 26.1°F (1942) | 1.43 in (1981) |
| September 28 | 91.0°F (1897) | 21.0°F (1942) | 1.07 in (1988) |
| September 29 | 91.9°F (2023) | 21.9°F (1945) | 2.50 in (1925) |
| September 30 | 93.0°F (2023) | 23.0°F (1939) | 1.55 in (1911) |