September weather in Winthrop, MN
The average temperature in Winthrop in September is 61.9°F (51.4°F–72.3°F). Average precipitation: inches.
September is a fall month in Winthrop, and is warmer than the annual average of 44.9°F. Daily temperatures swing about 20.9°F between overnight low and afternoon high. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
72.3°F
Avg Low
51.4°F
Precipitation
in
Daylight
12h 17m
September records in Winthrop
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (1960) | 39.9°F (1974) | 1.05 in (1997) |
| September 2 | 93.0°F (1960) | 44.1°F (1967) | 1.32 in (2010) |
| September 3 | 93.9°F (1960) | 34.0°F (1974) | 1.21 in (2008) |
| September 4 | 96.1°F (2023) | 39.9°F (1974) | 0.86 in (1980) |
| September 5 | 96.1°F (2023) | 37.9°F (1962) | 1.89 in (1992) |
| September 6 | 93.9°F (1960) | 41.0°F (1962) | 1.15 in (1961) |
| September 7 | 98.1°F (1978) | 39.9°F (1979) | 1.89 in (1992) |
| September 8 | 98.1°F (1978) | 39.0°F (1992) | 2.54 in (1991) |
| September 9 | 95.0°F (1978) | 39.0°F (1992) | 1.10 in (1971) |
| September 10 | 93.9°F (2002) | 37.0°F (2020) | 1.75 in (2009) |
| September 11 | 93.0°F (1978) | 37.9°F (1964) | 1.79 in (1980) |
| September 12 | 96.1°F (2012) | 34.0°F (1975) | 3.64 in (1978) |
| September 13 | 95.0°F (1998) | 36.0°F (1963) | 2.70 in (2005) |
| September 14 | 91.9°F (1998) | 36.0°F (2014) | 1.30 in (1991) |
| September 15 | 89.1°F (1994) | 30.0°F (2007) | 1.70 in (2004) |
| September 16 | 91.9°F (2018) | 30.9°F (1986) | 4.15 in (1992) |
| September 17 | 91.0°F (2025) | 37.0°F (1959) | 1.57 in (1968) |
| September 18 | 91.9°F (2018) | 36.0°F (2012) | 2.67 in (2018) |
| September 19 | 93.9°F (1998) | 34.0°F (1991) | 1.66 in (1963) |
| September 20 | 90.0°F (2021) | 32.0°F (1991) | 1.66 in (1993) |
| September 21 | 95.0°F (2022) | 33.1°F (1991) | 2.27 in (2018) |
| September 22 | 89.1°F (2005) | 27.0°F (1974) | 1.35 in (2004) |
| September 23 | 93.9°F (2017) | 30.0°F (1995) | 2.79 in (2010) |
| September 24 | 84.9°F (1958) | 33.1°F (1989) | 1.10 in (2010) |
| September 25 | 91.9°F (2017) | 30.9°F (1989) | 1.85 in (2005) |
| September 26 | 86.0°F (1974) | 23.0°F (1984) | 1.18 in (1973) |
| September 27 | 87.1°F (1987) | 33.1°F (1965) | 0.40 in (1965) |
| September 28 | 84.9°F (1983) | 28.0°F (1961) | 0.81 in (1985) |
| September 29 | 84.9°F (2024) | 30.9°F (1967) | 0.75 in (1998) |
| September 30 | 87.1°F (2025) | 28.9°F (1984) | 3.02 in (1965) |