September weather in McLaughlin, SD
The average temperature in McLaughlin in September is 59.5°F (45.3°F–73.6°F). Average precipitation: 1.45 inches.
September is a fall month in McLaughlin, and is warmer than the annual average of 43.3°F. Daily temperatures swing about 28.3°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.6°F
Avg Low
45.3°F
Precipitation
1.45 in
Daylight
12h 18m
September records in McLaughlin
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1970) | 30.9°F (1981) | 1.29 in (1963) |
| September 2 | 100.9°F (2012) | 32.0°F (1974) | 0.45 in (2006) |
| September 3 | 99.0°F (1948) | 30.0°F (1974) | 0.72 in (1954) |
| September 4 | 102.9°F (1948) | 30.9°F (1962) | 0.85 in (1999) |
| September 5 | 100.0°F (1978) | 28.9°F (1965) | 0.91 in (2023) |
| September 6 | 100.0°F (1976) | 30.9°F (1956) | 1.31 in (2019) |
| September 7 | 100.0°F (2002) | 34.0°F (1949) | 1.60 in (2010) |
| September 8 | 104.0°F (1959) | 36.0°F (1992) | 1.88 in (2013) |
| September 9 | 96.1°F (1952) | 33.1°F (2012) | 0.88 in (1962) |
| September 10 | 99.0°F (1982) | 30.0°F (1959) | 0.90 in (1979) |
| September 11 | 99.0°F (1948) | 27.0°F (1955) | 2.16 in (2019) |
| September 12 | 96.1°F (1952) | 28.0°F (1989) | 1.20 in (1961) |
| September 13 | 91.9°F (1959) | 26.1°F (1949) | 1.10 in (2001) |
| September 14 | 100.0°F (1948) | 21.9°F (1949) | 1.48 in (2001) |
| September 15 | 104.0°F (1948) | 28.9°F (2011) | 0.63 in (2025) |
| September 16 | 93.0°F (1948) | 30.0°F (1957) | 0.62 in (2016) |
| September 17 | 96.1°F (1989) | 30.0°F (1973) | 0.52 in (2022) |
| September 18 | 97.0°F (1998) | 28.0°F (2003) | 1.02 in (2025) |
| September 19 | 93.0°F (1984) | 18.0°F (1991) | 1.66 in (1996) |
| September 20 | 91.0°F (2022) | 26.1°F (1982) | 1.73 in (1955) |
| September 21 | 90.0°F (1984) | 17.1°F (1995) | 1.06 in (2018) |
| September 22 | 89.1°F (2015) | 17.1°F (1995) | 0.87 in (1955) |
| September 23 | 98.1°F (1958) | 24.1°F (2000) | 1.77 in (1977) |
| September 24 | 90.0°F (1958) | 21.0°F (1965) | 0.62 in (1984) |
| September 25 | 91.9°F (1949) | 27.0°F (1989) | 0.68 in (2018) |
| September 26 | 93.0°F (1952) | 16.0°F (1965) | 0.57 in (1976) |
| September 27 | 99.0°F (1952) | 23.0°F (1964) | 0.33 in (2006) |
| September 28 | 91.0°F (1952) | 21.0°F (1951) | 0.45 in (1971) |
| September 29 | 90.0°F (2024) | 19.9°F (1992) | 1.36 in (2019) |
| September 30 | 97.0°F (2024) | 23.0°F (2003) | 0.38 in (2014) |