September weather in Winthrop, IA
The average temperature in Winthrop in September is 62.9°F (50.9°F–74.9°F). Average precipitation: 3.53 inches.
September is a fall month in Winthrop, and is warmer than the annual average of 47°F. Daily temperatures swing about 24°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
74.9°F
Avg Low
50.9°F
Precipitation
3.53 in
Daylight
12h 16m
September records in Winthrop
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (1984) | 44.1°F (1892) | 1.63 in (1989) |
| September 2 | 96.1°F (1999) | 45.0°F (2003) | 2.80 in (1875) |
| September 3 | 90.0°F (1983) | 44.1°F (1982) | 3.07 in (1887) |
| September 4 | 90.0°F (1983) | 42.1°F (1984) | 1.40 in (1991) |
| September 5 | 91.9°F (1990) | 39.9°F (1988) | 1.80 in (1887) |
| September 6 | 93.0°F (1998) | 36.0°F (1988) | 1.60 in (1876) |
| September 7 | 95.0°F (1985) | 36.0°F (1986) | 2.10 in (1875) |
| September 8 | 91.0°F (2003) | 37.0°F (1986) | 3.42 in (1989) |
| September 9 | 91.0°F (1983) | 37.9°F (1988) | 3.50 in (1875) |
| September 10 | 89.1°F (2000) | 37.9°F (2008) | 1.45 in (1881) |
| September 11 | 95.0°F (2000) | 37.0°F (1992) | 3.00 in (1879) |
| September 12 | 91.9°F (1998) | 37.0°F (2007) | 1.70 in (1887) |
| September 13 | 89.1°F (1994) | 36.0°F (1985) | 3.78 in (1961) |
| September 14 | 90.0°F (1994) | 34.0°F (1996) | 1.80 in (1874) |
| September 15 | 88.0°F (1994) | 32.0°F (1984) | 1.25 in (1883) |
| September 16 | 84.9°F (1997) | 28.9°F (1984) | 0.61 in (1983) |
| September 17 | 93.9°F (1988) | 36.0°F (1981) | 1.00 in (1890) |
| September 18 | 90.0°F (2007) | 34.0°F (1981) | 1.80 in (1867) |
| September 19 | 90.0°F (1984) | 32.0°F (1991) | 2.85 in (1988) |
| September 20 | 82.0°F (1984) | 28.0°F (1991) | 1.40 in (1980) |
| September 21 | 90.0°F (2005) | 33.1°F (1982) | 1.08 in (1965) |
| September 22 | 93.0°F (2005) | 30.0°F (1983) | 1.40 in (1887) |
| September 23 | 90.0°F (1892) | 26.1°F (1983) | 7.50 in (1884) |
| September 24 | 89.1°F (1984) | 28.9°F (1985) | 1.55 in (1960) |
| September 25 | 84.9°F (1986) | 33.1°F (1985) | 1.60 in (1981) |
| September 26 | 87.1°F (1986) | 26.1°F (1984) | 2.70 in (1880) |
| September 27 | 84.9°F (1990) | 28.0°F (1985) | 2.15 in (1881) |
| September 28 | 84.0°F (1983) | 30.9°F (1981) | 0.59 in (1965) |
| September 29 | 82.0°F (1892) | 27.0°F (1984) | 1.65 in (1870) |
| September 30 | 84.9°F (1892) | 28.9°F (2003) | 2.70 in (1868) |