September weather in Deer Park, WI
The average temperature in Deer Park in September is 60.2°F (49.6°F–70.7°F). Average precipitation: 3.68 inches.
September is a fall month in Deer Park, and is warmer than the annual average of 43.5°F. Daily temperatures swing about 21.1°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
70.7°F
Avg Low
49.6°F
Precipitation
3.68 in
Daylight
12h 18m
September records in Deer Park
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (1937) | 30.9°F (1974) | 1.68 in (1989) |
| September 2 | 93.9°F (1925) | 35.1°F (1930) | 2.23 in (2002) |
| September 3 | 93.9°F (1925) | 28.9°F (1946) | 4.98 in (2015) |
| September 4 | 96.1°F (1925) | 32.0°F (1974) | 1.67 in (1941) |
| September 5 | 93.9°F (2023) | 35.1°F (1962) | 1.50 in (1925) |
| September 6 | 91.9°F (1922) | 35.1°F (1932) | 2.90 in (2002) |
| September 7 | 91.9°F (1960) | 32.0°F (1932) | 0.93 in (1972) |
| September 8 | 97.0°F (1931) | 36.0°F (1965) | 4.08 in (1991) |
| September 9 | 93.9°F (1978) | 32.0°F (1924) | 3.07 in (1938) |
| September 10 | 102.9°F (1931) | 33.1°F (2020) | 2.00 in (1936) |
| September 11 | 95.0°F (1931) | 30.0°F (1955) | 1.83 in (1939) |
| September 12 | 95.0°F (1948) | 28.0°F (1955) | 2.42 in (1978) |
| September 13 | 90.0°F (1939) | 28.9°F (1923) | 1.64 in (2019) |
| September 14 | 93.0°F (1939) | 26.1°F (1923) | 1.47 in (1941) |
| September 15 | 93.9°F (1948) | 27.0°F (2011) | 1.52 in (2004) |
| September 16 | 93.0°F (1948) | 32.0°F (1932) | 1.53 in (1931) |
| September 17 | 90.0°F (1955) | 26.1°F (1943) | 2.28 in (2015) |
| September 18 | 90.0°F (1955) | 23.0°F (1929) | 2.01 in (2015) |
| September 19 | 93.9°F (1940) | 26.1°F (1929) | 1.69 in (2003) |
| September 20 | 88.0°F (1984) | 28.0°F (1929) | 3.86 in (1988) |
| September 21 | 84.9°F (1941) | 27.0°F (1982) | 2.80 in (2018) |
| September 22 | 91.0°F (1936) | 25.0°F (1974) | 1.25 in (2016) |
| September 23 | 91.0°F (1937) | 25.0°F (1983) | 2.56 in (1968) |
| September 24 | 88.0°F (1935) | 26.1°F (1976) | 1.80 in (2010) |
| September 25 | 86.0°F (2017) | 23.0°F (1947) | 1.97 in (1934) |
| September 26 | 82.0°F (1986) | 23.0°F (1985) | 1.87 in (1930) |
| September 27 | 82.9°F (1952) | 23.0°F (1985) | 1.45 in (1924) |
| September 28 | 84.9°F (1987) | 23.0°F (1942) | 1.13 in (1971) |
| September 29 | 84.0°F (2024) | 21.9°F (1945) | 0.89 in (1988) |
| September 30 | 82.0°F (1971) | 21.9°F (1939) | 1.37 in (1995) |