September weather in Fort Atkinson, WI
The average temperature in Fort Atkinson in September is 62.6°F (51.2°F–74.0°F). Average precipitation: 3.33 inches.
September is a fall month in Fort Atkinson, and is warmer than the annual average of 47.3°F. Daily temperatures swing about 22.8°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
51.2°F
Precipitation
3.33 in
Daylight
12h 17m
September records in Fort Atkinson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1953) | 39.0°F (1949) | 2.88 in (1989) |
| September 2 | 98.1°F (1953) | 39.9°F (1946) | 1.09 in (1961) |
| September 3 | 93.9°F (1953) | 39.9°F (1987) | 1.35 in (1970) |
| September 4 | 93.0°F (2023) | 37.0°F (1974) | 1.32 in (1953) |
| September 5 | 93.0°F (2023) | 37.9°F (1962) | 1.36 in (2008) |
| September 6 | 93.9°F (1954) | 33.1°F (1988) | 1.84 in (2018) |
| September 7 | 97.0°F (1985) | 35.1°F (1988) | 1.85 in (1970) |
| September 8 | 93.0°F (1960) | 37.0°F (1986) | 4.50 in (1941) |
| September 9 | 98.1°F (1955) | 37.9°F (1975) | 1.30 in (1941) |
| September 10 | 93.0°F (1978) | 39.9°F (1967) | 2.00 in (2001) |
| September 11 | 93.0°F (2005) | 35.1°F (1943) | 1.41 in (1986) |
| September 12 | 91.0°F (2005) | 35.1°F (1955) | 3.80 in (2022) |
| September 13 | 91.0°F (2005) | 33.1°F (1964) | 1.78 in (1961) |
| September 14 | 90.0°F (1998) | 35.1°F (1963) | 4.47 in (1961) |
| September 15 | 87.1°F (2024) | 34.0°F (2007) | 1.07 in (1998) |
| September 16 | 90.0°F (1955) | 30.9°F (1984) | 0.65 in (1983) |
| September 17 | 91.0°F (1955) | 30.9°F (1984) | 1.87 in (1992) |
| September 18 | 93.0°F (1955) | 33.1°F (1959) | 2.20 in (1978) |
| September 19 | 89.1°F (1948) | 33.1°F (2012) | 2.87 in (1960) |
| September 20 | 90.0°F (2021) | 30.0°F (1956) | 1.96 in (1965) |
| September 21 | 91.0°F (2017) | 30.0°F (1999) | 2.55 in (1947) |
| September 22 | 91.9°F (2024) | 28.0°F (1974) | 2.14 in (2024) |
| September 23 | 93.9°F (2017) | 28.0°F (1974) | 1.60 in (2009) |
| September 24 | 93.9°F (2017) | 28.0°F (1976) | 1.25 in (1977) |
| September 25 | 91.0°F (2017) | 28.9°F (1942) | 3.35 in (1984) |
| September 26 | 91.9°F (2017) | 30.0°F (1947) | 1.85 in (1993) |
| September 27 | 91.9°F (2017) | 28.0°F (1991) | 1.60 in (1959) |
| September 28 | 89.1°F (1952) | 28.0°F (1942) | 1.31 in (1999) |
| September 29 | 93.9°F (1953) | 28.9°F (1991) | 1.36 in (2002) |
| September 30 | 89.1°F (1971) | 28.0°F (1984) | 1.20 in (1941) |