September weather in Plymouth, WI
The average temperature in Plymouth in September is 61.1°F (50.5°F–71.8°F). Average precipitation: 2.81 inches.
September is a fall month in Plymouth, and is warmer than the annual average of 45.7°F. Daily temperatures swing about 21.3°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
71.8°F
Avg Low
50.5°F
Precipitation
2.81 in
Daylight
12h 17m
September records in Plymouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1953) | 37.9°F (1949) | 1.06 in (1937) |
| September 2 | 98.1°F (1953) | 39.9°F (1967) | 2.04 in (2000) |
| September 3 | 93.9°F (1939) | 39.9°F (1974) | 1.96 in (1970) |
| September 4 | 91.9°F (2023) | 41.0°F (1967) | 1.58 in (1939) |
| September 5 | 91.0°F (1922) | 39.0°F (1974) | 1.26 in (1947) |
| September 6 | 91.9°F (1933) | 39.0°F (1924) | 0.92 in (1925) |
| September 7 | 95.0°F (1959) | 37.0°F (1986) | 2.38 in (2016) |
| September 8 | 96.1°F (1931) | 39.0°F (1975) | 2.50 in (1941) |
| September 9 | 95.0°F (1931) | 36.0°F (1975) | 2.41 in (1965) |
| September 10 | 97.0°F (1931) | 34.0°F (1917) | 1.46 in (1986) |
| September 11 | 96.1°F (1931) | 36.0°F (1943) | 6.12 in (1986) |
| September 12 | 91.9°F (2005) | 37.9°F (1967) | 1.99 in (1978) |
| September 13 | 93.9°F (1939) | 33.1°F (1923) | 2.70 in (1961) |
| September 14 | 96.1°F (1939) | 30.0°F (1923) | 2.20 in (1990) |
| September 15 | 95.0°F (1939) | 36.0°F (1989) | 1.38 in (1914) |
| September 16 | 91.0°F (1948) | 30.0°F (1916) | 1.85 in (1915) |
| September 17 | 89.1°F (1955) | 35.1°F (1943) | 1.02 in (1987) |
| September 18 | 91.0°F (1955) | 32.0°F (1929) | 2.11 in (1983) |
| September 19 | 90.0°F (1932) | 30.0°F (2012) | 2.99 in (1977) |
| September 20 | 89.1°F (1931) | 30.0°F (1956) | 2.95 in (1965) |
| September 21 | 90.0°F (1920) | 34.0°F (2006) | 1.81 in (1947) |
| September 22 | 89.1°F (1937) | 28.0°F (1974) | 1.91 in (1988) |
| September 23 | 91.0°F (2017) | 26.1°F (1974) | 1.37 in (2019) |
| September 24 | 91.0°F (2017) | 28.0°F (1976) | 1.44 in (1970) |
| September 25 | 89.1°F (2017) | 28.0°F (1942) | 1.17 in (1931) |
| September 26 | 89.1°F (2017) | 25.0°F (1926) | 2.05 in (1959) |
| September 27 | 86.0°F (1946) | 30.0°F (1989) | 1.35 in (1996) |
| September 28 | 87.1°F (1952) | 28.9°F (1942) | 1.56 in (1963) |
| September 29 | 84.0°F (1971) | 28.0°F (1942) | 1.54 in (1919) |
| September 30 | 84.0°F (2025) | 28.0°F (1993) | 3.80 in (1961) |