September weather in Clear Lake, SD
The average temperature in Clear Lake in September is 59.5°F (48.7°F–70.3°F). Average precipitation: 3.01 inches.
September is a fall month in Clear Lake, and is warmer than the annual average of 42.4°F. Daily temperatures swing about 21.6°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
70.3°F
Avg Low
48.7°F
Precipitation
3.01 in
Daylight
12h 18m
September records in Clear Lake
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (1960) | 39.0°F (1974) | 1.91 in (1904) |
| September 2 | 95.0°F (1983) | 39.9°F (1972) | 4.40 in (2006) |
| September 3 | 93.9°F (1983) | 34.0°F (1974) | 1.90 in (1999) |
| September 4 | 90.0°F (1960) | 33.1°F (1956) | 1.78 in (1989) |
| September 5 | 93.9°F (1960) | 34.0°F (1965) | 2.65 in (1958) |
| September 6 | 96.1°F (1970) | 34.0°F (1956) | 1.77 in (1948) |
| September 7 | 95.0°F (1970) | 36.0°F (1956) | 0.98 in (1991) |
| September 8 | 97.0°F (1959) | 35.1°F (1995) | 2.06 in (1985) |
| September 9 | 95.0°F (1904) | 37.0°F (1969) | 1.53 in (1946) |
| September 10 | 96.1°F (1981) | 30.9°F (1959) | 0.91 in (1961) |
| September 11 | 95.0°F (1981) | 30.9°F (1955) | 1.70 in (1903) |
| September 12 | 91.9°F (2012) | 35.1°F (1960) | 2.47 in (2019) |
| September 13 | 89.1°F (1990) | 32.0°F (1903) | 1.68 in (1946) |
| September 14 | 90.0°F (1969) | 30.0°F (1956) | 1.13 in (1906) |
| September 15 | 96.1°F (1955) | 30.0°F (2011) | 0.51 in (2001) |
| September 16 | 91.9°F (2018) | 28.9°F (1959) | 1.88 in (2010) |
| September 17 | 93.0°F (1955) | 30.0°F (1903) | 1.40 in (1942) |
| September 18 | 91.9°F (1984) | 34.0°F (1991) | 0.84 in (1978) |
| September 19 | 93.0°F (1984) | 32.0°F (1991) | 3.63 in (1957) |
| September 20 | 90.0°F (1984) | 30.0°F (1962) | 1.46 in (2018) |
| September 21 | 84.9°F (2019) | 28.9°F (1983) | 2.00 in (2004) |
| September 22 | 89.1°F (1908) | 23.0°F (1974) | 0.93 in (2006) |
| September 23 | 88.0°F (2017) | 21.0°F (2000) | 2.22 in (1977) |
| September 24 | 87.1°F (2007) | 19.0°F (2000) | 2.30 in (1984) |
| September 25 | 88.0°F (1967) | 19.0°F (2000) | 2.20 in (1908) |
| September 26 | 90.0°F (1956) | 21.9°F (1965) | 1.48 in (1999) |
| September 27 | 93.9°F (1956) | 28.0°F (1967) | 0.69 in (1975) |
| September 28 | 82.9°F (1956) | 23.0°F (1961) | 0.77 in (1988) |
| September 29 | 87.1°F (2011) | 25.0°F (1908) | 0.29 in (1982) |
| September 30 | 84.9°F (1976) | 23.0°F (1974) | 2.85 in (1995) |