September weather in Plymouth, IA
The average temperature in Plymouth in September is 61.8°F (50.1°F–73.5°F). Average precipitation: 3.24 inches.
September is a fall month in Plymouth, and is warmer than the annual average of 45.6°F. Daily temperatures swing about 23.4°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
73.5°F
Avg Low
50.1°F
Precipitation
3.24 in
Daylight
12h 17m
September records in Plymouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1984) | 33.1°F (1949) | 1.75 in (1923) |
| September 2 | 99.0°F (1925) | 34.0°F (1928) | 0.90 in (1906) |
| September 3 | 96.1°F (1925) | 32.0°F (1974) | 1.23 in (2021) |
| September 4 | 100.0°F (1925) | 35.1°F (1974) | 1.34 in (1920) |
| September 5 | 100.0°F (1913) | 36.0°F (1918) | 3.62 in (1985) |
| September 6 | 102.9°F (1922) | 39.9°F (1932) | 2.29 in (1938) |
| September 7 | 99.0°F (1978) | 34.0°F (1986) | 2.68 in (2016) |
| September 8 | 97.0°F (1978) | 35.1°F (1986) | 5.20 in (1964) |
| September 9 | 98.1°F (1955) | 34.0°F (1924) | 3.30 in (1971) |
| September 10 | 98.1°F (1931) | 35.1°F (1910) | 1.70 in (1896) |
| September 11 | 93.9°F (1931) | 30.9°F (1894) | 1.53 in (1936) |
| September 12 | 95.0°F (1927) | 30.0°F (1955) | 3.50 in (1978) |
| September 13 | 95.0°F (1939) | 30.9°F (1953) | 4.35 in (1930) |
| September 14 | 95.0°F (1927) | 28.0°F (1923) | 1.70 in (1909) |
| September 15 | 95.0°F (1939) | 32.0°F (2007) | 3.48 in (2004) |
| September 16 | 93.9°F (1931) | 30.0°F (1937) | 1.51 in (2016) |
| September 17 | 93.9°F (1925) | 30.9°F (1943) | 1.61 in (1965) |
| September 18 | 91.9°F (1947) | 26.1°F (1929) | 2.52 in (1942) |
| September 19 | 96.1°F (1948) | 25.0°F (1894) | 2.37 in (1988) |
| September 20 | 90.0°F (1895) | 28.0°F (1897) | 5.02 in (1983) |
| September 21 | 93.9°F (2022) | 28.9°F (1918) | 1.78 in (1895) |
| September 22 | 93.9°F (1937) | 23.0°F (1974) | 2.88 in (2016) |
| September 23 | 91.9°F (2017) | 21.9°F (1983) | 1.50 in (2016) |
| September 24 | 90.0°F (2017) | 28.9°F (1942) | 2.24 in (2015) |
| September 25 | 89.1°F (2017) | 26.1°F (1942) | 2.20 in (1972) |
| September 26 | 88.0°F (1986) | 21.9°F (1984) | 1.69 in (1924) |
| September 27 | 88.0°F (1998) | 19.9°F (1987) | 1.05 in (1965) |
| September 28 | 89.1°F (1898) | 19.9°F (1942) | 1.29 in (1929) |
| September 29 | 88.0°F (1897) | 24.1°F (1945) | 1.76 in (1973) |
| September 30 | 91.0°F (1952) | 15.1°F (1899) | 2.19 in (1925) |