September weather in Webster, SD
The average temperature in Webster in September is 60.2°F (49.6°F–70.7°F). Average precipitation: 2.56 inches.
September is a fall month in Webster, and is warmer than the annual average of 42.7°F. Daily temperatures swing about 21.1°F between overnight low and afternoon high. Expect about 7 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
2.56 in
Daylight
12h 18m
September records in Webster
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1894) | 37.9°F (1965) | 2.40 in (2008) |
| September 2 | 99.0°F (1894) | 36.0°F (1974) | 1.65 in (2008) |
| September 3 | 95.0°F (1960) | 28.9°F (1896) | 1.40 in (1999) |
| September 4 | 97.0°F (2023) | 35.1°F (1956) | 0.80 in (1999) |
| September 5 | 96.1°F (1895) | 32.0°F (1965) | 0.99 in (1894) |
| September 6 | 98.1°F (1978) | 32.0°F (1896) | 0.98 in (1981) |
| September 7 | 96.1°F (1978) | 25.0°F (1895) | 1.01 in (1964) |
| September 8 | 97.0°F (1959) | 32.0°F (1975) | 2.22 in (1985) |
| September 9 | 93.0°F (1979) | 37.0°F (1972) | 0.76 in (1954) |
| September 10 | 104.0°F (1895) | 28.9°F (1959) | 0.82 in (2019) |
| September 11 | 93.0°F (1978) | 24.1°F (1896) | 1.03 in (1984) |
| September 12 | 93.0°F (1990) | 30.0°F (1975) | 1.68 in (1982) |
| September 13 | 93.9°F (1895) | 28.0°F (1975) | 0.75 in (1896) |
| September 14 | 97.0°F (1895) | 33.1°F (1956) | 1.25 in (2001) |
| September 15 | 95.0°F (1955) | 33.1°F (1894) | 1.64 in (2010) |
| September 16 | 99.0°F (1895) | 30.0°F (1959) | 0.75 in (2016) |
| September 17 | 102.0°F (1895) | 26.1°F (1894) | 0.87 in (2003) |
| September 18 | 100.0°F (1895) | 28.9°F (1971) | 0.92 in (2025) |
| September 19 | 102.9°F (1895) | 19.9°F (1896) | 2.50 in (1988) |
| September 20 | 90.0°F (1895) | 28.9°F (1973) | 4.06 in (2007) |
| September 21 | 86.0°F (2015) | 28.9°F (1983) | 2.75 in (1989) |
| September 22 | 88.0°F (1958) | 21.9°F (1896) | 1.16 in (1968) |
| September 23 | 88.0°F (2017) | 25.0°F (1976) | 1.08 in (2010) |
| September 24 | 84.0°F (1990) | 21.0°F (1894) | 2.07 in (2017) |
| September 25 | 84.0°F (1990) | 28.0°F (1982) | 0.78 in (1963) |
| September 26 | 90.0°F (1974) | 21.9°F (1965) | 0.50 in (2017) |
| September 27 | 98.1°F (1894) | 26.1°F (1976) | 0.50 in (1996) |
| September 28 | 88.0°F (1894) | 23.0°F (1992) | 1.24 in (2013) |
| September 29 | 88.0°F (2021) | 23.0°F (1895) | 0.80 in (1965) |
| September 30 | 88.0°F (2021) | 17.1°F (1895) | 0.41 in (1962) |