September weather in Windsor, WI
The average temperature in Windsor in September is 61.4°F (49.4°F–73.4°F). Average precipitation: 3.34 inches.
September is a fall month in Windsor, and is warmer than the annual average of 46°F. Daily temperatures swing about 24°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
73.4°F
Avg Low
49.4°F
Precipitation
3.34 in
Daylight
12h 17m
September records in Windsor
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (2000) | 37.9°F (2009) | 2.90 in (1989) |
| September 2 | 93.0°F (2011) | 37.0°F (2009) | 1.98 in (1973) |
| September 3 | 91.9°F (2008) | 39.0°F (1974) | 2.22 in (1966) |
| September 4 | 93.9°F (2023) | 37.0°F (1974) | 1.97 in (2022) |
| September 5 | 93.0°F (2023) | 35.1°F (1962) | 1.63 in (1965) |
| September 6 | 91.9°F (1990) | 33.1°F (1962) | 2.25 in (1970) |
| September 7 | 93.9°F (1978) | 34.0°F (1986) | 2.28 in (1965) |
| September 8 | 96.1°F (1978) | 36.0°F (1986) | 2.95 in (1985) |
| September 9 | 93.9°F (1978) | 36.0°F (1975) | 0.98 in (1968) |
| September 10 | 91.0°F (2005) | 35.1°F (1967) | 3.15 in (1965) |
| September 11 | 95.0°F (2013) | 32.0°F (1993) | 3.12 in (1986) |
| September 12 | 91.0°F (2005) | 35.1°F (1964) | 2.46 in (1991) |
| September 13 | 87.1°F (1984) | 33.1°F (1963) | 2.22 in (2003) |
| September 14 | 84.9°F (1994) | 28.0°F (2007) | 1.92 in (1993) |
| September 15 | 87.1°F (2024) | 28.0°F (2011) | 1.43 in (1967) |
| September 16 | 90.0°F (2024) | 30.0°F (2011) | 1.62 in (1992) |
| September 17 | 88.0°F (1988) | 33.1°F (2013) | 1.21 in (1987) |
| September 18 | 89.1°F (2018) | 35.1°F (2012) | 2.81 in (2015) |
| September 19 | 87.1°F (1984) | 33.1°F (2012) | 0.67 in (1971) |
| September 20 | 88.0°F (2021) | 28.9°F (1991) | 1.52 in (1980) |
| September 21 | 90.0°F (2017) | 28.9°F (1991) | 1.58 in (2021) |
| September 22 | 86.0°F (2024) | 26.1°F (1974) | 3.26 in (1980) |
| September 23 | 91.0°F (2017) | 25.0°F (1974) | 1.90 in (2009) |
| September 24 | 91.9°F (2017) | 27.0°F (2012) | 2.22 in (1970) |
| September 25 | 90.0°F (2017) | 28.0°F (2012) | 1.96 in (2005) |
| September 26 | 90.0°F (2017) | 28.9°F (1965) | 1.85 in (2011) |
| September 27 | 84.9°F (1963) | 26.1°F (1991) | 1.00 in (1992) |
| September 28 | 84.9°F (1971) | 28.0°F (1991) | 1.18 in (1965) |
| September 29 | 82.9°F (1971) | 25.0°F (1962) | 1.32 in (1986) |
| September 30 | 84.9°F (2021) | 25.0°F (1993) | 1.10 in (2007) |