August weather in Custer, SD
The average temperature in Custer in August is 66.7°F (54.6°F–78.7°F). Average precipitation: 2.43 inches.
August is a summer month in Custer, and is warmer than the annual average of 44.9°F. Daily temperatures swing about 24.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 13h 49m. For travel, August is one of the best months of the year to visit.
Avg High
78.7°F
Avg Low
54.6°F
Precipitation
2.43 in
Daylight
13h 49m
August records in Custer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 93.9°F (1966) | 35.1°F (1968) | 2.00 in (1999) |
| August 2 | 93.0°F (1963) | 37.0°F (1950) | 2.42 in (2019) |
| August 3 | 91.9°F (1947) | 32.0°F (1978) | 1.58 in (1988) |
| August 4 | 93.9°F (1947) | 36.0°F (1978) | 1.90 in (2011) |
| August 5 | 93.9°F (1960) | 35.1°F (1980) | 1.04 in (1977) |
| August 6 | 93.0°F (2022) | 42.1°F (1976) | 1.82 in (2002) |
| August 7 | 95.0°F (1975) | 37.0°F (1953) | 3.20 in (1999) |
| August 8 | 96.1°F (1975) | 24.1°F (2024) | 1.70 in (1999) |
| August 9 | 93.0°F (1992) | 32.0°F (1960) | 0.91 in (1968) |
| August 10 | 91.9°F (1958) | 34.0°F (1960) | 1.17 in (1947) |
| August 11 | 91.9°F (1978) | 37.0°F (1980) | 0.85 in (1925) |
| August 12 | 93.9°F (1969) | 30.9°F (1964) | 1.47 in (1932) |
| August 13 | 93.9°F (1965) | 28.9°F (1966) | 1.66 in (1947) |
| August 14 | 91.9°F (1970) | 37.9°F (1969) | 0.83 in (1996) |
| August 15 | 93.9°F (1988) | 32.0°F (1959) | 1.33 in (1930) |
| August 16 | 96.1°F (1988) | 35.1°F (1985) | 1.17 in (1931) |
| August 17 | 91.9°F (2021) | 34.0°F (2002) | 1.40 in (2025) |
| August 18 | 91.9°F (1959) | 34.0°F (1966) | 2.18 in (2007) |
| August 19 | 95.0°F (1986) | 30.0°F (1978) | 0.91 in (1993) |
| August 20 | 91.0°F (1948) | 33.1°F (1950) | 1.09 in (1922) |
| August 21 | 91.0°F (1947) | 33.1°F (1950) | 1.15 in (1923) |
| August 22 | 91.9°F (2010) | 21.9°F (1966) | 1.19 in (1934) |
| August 23 | 95.0°F (1971) | 28.0°F (1966) | 0.76 in (1963) |
| August 24 | 91.9°F (1949) | 28.0°F (1962) | 0.86 in (1973) |
| August 25 | 91.9°F (2011) | 26.1°F (1964) | 0.48 in (1915) |
| August 26 | 91.9°F (2011) | 28.9°F (1960) | 1.75 in (1946) |
| August 27 | 91.0°F (1967) | 34.0°F (1965) | 3.50 in (1933) |
| August 28 | 91.9°F (1969) | 27.0°F (1962) | 2.12 in (1920) |
| August 29 | 91.0°F (1969) | 34.0°F (1988) | 1.26 in (1939) |
| August 30 | 93.9°F (2012) | 32.0°F (1946) | 0.70 in (1967) |
| August 31 | 93.9°F (1948) | 30.0°F (1965) | 0.48 in (1931) |