September weather in Lake Mills, WI
The average temperature in Lake Mills in September is 62.9°F (51.7°F–74.0°F). Average precipitation: 3.47 inches.
September is a fall month in Lake Mills, and is warmer than the annual average of 47.4°F. Daily temperatures swing about 22.3°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
74.0°F
Avg Low
51.7°F
Precipitation
3.47 in
Daylight
12h 17m
September records in Lake Mills
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1953) | 36.0°F (1909) | 2.87 in (1989) |
| September 2 | 97.0°F (1953) | 37.9°F (1909) | 1.20 in (1930) |
| September 3 | 93.0°F (1925) | 39.9°F (1974) | 1.18 in (1970) |
| September 4 | 97.0°F (1925) | 39.9°F (1974) | 1.70 in (1953) |
| September 5 | 93.9°F (1897) | 41.0°F (1974) | 2.85 in (1947) |
| September 6 | 93.9°F (1922) | 37.0°F (1924) | 1.63 in (2018) |
| September 7 | 100.0°F (1939) | 39.9°F (1986) | 2.23 in (1916) |
| September 8 | 98.1°F (1978) | 39.9°F (1944) | 5.11 in (1941) |
| September 9 | 96.1°F (1897) | 37.9°F (1924) | 2.08 in (1922) |
| September 10 | 96.1°F (1931) | 33.1°F (1917) | 2.27 in (1986) |
| September 11 | 96.1°F (2013) | 34.0°F (1943) | 2.50 in (1933) |
| September 12 | 93.0°F (1939) | 35.1°F (1902) | 4.68 in (2022) |
| September 13 | 96.1°F (1939) | 33.1°F (1923) | 3.59 in (2006) |
| September 14 | 99.0°F (1939) | 28.0°F (1923) | 2.00 in (2003) |
| September 15 | 99.0°F (1939) | 34.0°F (2007) | 1.40 in (1934) |
| September 16 | 91.0°F (1906) | 30.0°F (1916) | 1.74 in (1991) |
| September 17 | 91.9°F (1927) | 35.1°F (1943) | 1.41 in (1987) |
| September 18 | 90.0°F (1955) | 35.1°F (1901) | 3.21 in (2015) |
| September 19 | 91.9°F (1895) | 32.0°F (1918) | 2.22 in (1960) |
| September 20 | 91.9°F (1895) | 32.0°F (1896) | 2.30 in (1965) |
| September 21 | 93.0°F (2017) | 33.1°F (1904) | 1.59 in (1947) |
| September 22 | 90.0°F (1895) | 28.0°F (1974) | 1.71 in (2024) |
| September 23 | 93.9°F (2017) | 26.1°F (1974) | 2.08 in (2009) |
| September 24 | 93.9°F (2017) | 28.9°F (1928) | 2.20 in (1958) |
| September 25 | 91.9°F (1920) | 28.9°F (1942) | 3.09 in (1984) |
| September 26 | 93.0°F (2017) | 25.0°F (1926) | 1.83 in (1930) |
| September 27 | 84.9°F (1986) | 30.0°F (1893) | 1.54 in (1911) |
| September 28 | 89.1°F (1894) | 28.0°F (1893) | 1.10 in (1999) |
| September 29 | 91.0°F (1953) | 26.1°F (1949) | 1.54 in (1986) |
| September 30 | 89.1°F (1937) | 24.1°F (1899) | 1.43 in (1941) |