September weather in Grenville, SD
The average temperature in Grenville in September is 62.3°F (52.0°F–72.6°F). Average precipitation: 2.39 inches.
September is a fall month in Grenville, and is warmer than the annual average of 44.1°F. Daily temperatures swing about 20.6°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 18m. For travel, September is one of the best months of the year to visit.
Avg High
72.6°F
Avg Low
52.0°F
Precipitation
2.39 in
Daylight
12h 18m
September records in Grenville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (1970) | 43.0°F (1965) | 0.70 in (1959) |
| September 2 | 95.0°F (1976) | 36.0°F (1974) | 2.10 in (2008) |
| September 3 | 93.9°F (1976) | 34.0°F (1974) | 1.12 in (1986) |
| September 4 | 95.0°F (1952) | 37.0°F (1956) | 1.20 in (1999) |
| September 5 | 95.0°F (1978) | 34.0°F (1965) | 1.89 in (2004) |
| September 6 | 97.0°F (1976) | 35.1°F (1956) | 0.70 in (1981) |
| September 7 | 95.0°F (1970) | 39.9°F (1955) | 1.11 in (1996) |
| September 8 | 96.1°F (1959) | 37.9°F (2020) | 0.73 in (1976) |
| September 9 | 93.9°F (1983) | 39.0°F (1969) | 1.75 in (1991) |
| September 10 | 91.9°F (1952) | 32.0°F (1959) | 0.80 in (1961) |
| September 11 | 90.0°F (1978) | 33.1°F (1964) | 0.95 in (2009) |
| September 12 | 91.9°F (1969) | 33.1°F (1975) | 1.49 in (2019) |
| September 13 | 91.0°F (1969) | 30.0°F (1970) | 0.55 in (2005) |
| September 14 | 95.0°F (1969) | 30.9°F (1956) | 1.00 in (1991) |
| September 15 | 95.0°F (1955) | 34.0°F (1993) | 0.95 in (2010) |
| September 16 | 93.9°F (1955) | 32.0°F (1959) | 1.09 in (2016) |
| September 17 | 91.0°F (1955) | 32.0°F (1981) | 0.69 in (1968) |
| September 18 | 91.0°F (1974) | 32.0°F (1971) | 1.18 in (2003) |
| September 19 | 91.0°F (1984) | 33.1°F (1962) | 2.34 in (1988) |
| September 20 | 91.0°F (1984) | 30.9°F (1962) | 2.59 in (2007) |
| September 21 | 87.1°F (2005) | 28.0°F (1983) | 2.21 in (1989) |
| September 22 | 88.0°F (1958) | 26.1°F (1974) | 1.15 in (1968) |
| September 23 | 84.9°F (1958) | 28.0°F (1976) | 0.78 in (2006) |
| September 24 | 82.9°F (1956) | 28.9°F (1965) | 1.21 in (1973) |
| September 25 | 87.1°F (1990) | 28.0°F (1965) | 1.01 in (2009) |
| September 26 | 91.9°F (1974) | 21.9°F (1965) | 0.68 in (1999) |
| September 27 | 91.9°F (1952) | 27.0°F (1967) | 0.35 in (1996) |
| September 28 | 89.1°F (1956) | 25.0°F (1976) | 1.38 in (2013) |
| September 29 | 82.9°F (2011) | 26.1°F (1984) | 1.07 in (1965) |
| September 30 | 89.1°F (1976) | 28.0°F (1984) | 1.86 in (1995) |