August weather in Interior, SD
The average temperature in Interior in August is 75.3°F (60.2°F–90.5°F). Average precipitation: 1.81 inches.
August is a summer month in Interior, and is warmer than the annual average of 50.4°F. Daily temperatures swing about 30.3°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 13h 49m. For travel, August is hot.
Avg High
90.5°F
Avg Low
60.2°F
Precipitation
1.81 in
Daylight
13h 49m
August records in Interior
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 109.0°F (1955) | 48.0°F (2009) | 1.50 in (2025) |
| August 2 | 107.1°F (2022) | 51.1°F (1972) | 1.13 in (1972) |
| August 3 | 107.1°F (1955) | 42.1°F (1978) | 1.03 in (2010) |
| August 4 | 107.1°F (1959) | 45.0°F (1974) | 1.02 in (2011) |
| August 5 | 107.1°F (2022) | 46.9°F (1980) | 0.65 in (1995) |
| August 6 | 109.0°F (1980) | 50.0°F (1978) | 1.36 in (2013) |
| August 7 | 109.9°F (1975) | 45.0°F (1989) | 0.68 in (1987) |
| August 8 | 106.0°F (1985) | 52.0°F (1996) | 1.78 in (1979) |
| August 9 | 105.1°F (1985) | 50.0°F (1960) | 1.51 in (1968) |
| August 10 | 105.1°F (2007) | 42.1°F (2004) | 1.49 in (1974) |
| August 11 | 109.0°F (1959) | 42.1°F (2004) | 0.35 in (1958) |
| August 12 | 107.1°F (1965) | 39.9°F (1964) | 1.20 in (1991) |
| August 13 | 107.1°F (2007) | 45.0°F (2004) | 0.96 in (2005) |
| August 14 | 106.0°F (2007) | 44.1°F (1978) | 0.39 in (2018) |
| August 15 | 109.9°F (1988) | 48.0°F (1985) | 1.51 in (1978) |
| August 16 | 107.1°F (1973) | 46.0°F (2013) | 0.85 in (1993) |
| August 17 | 106.0°F (2021) | 42.1°F (2009) | 0.70 in (1960) |
| August 18 | 109.0°F (1959) | 46.9°F (1978) | 1.11 in (2015) |
| August 19 | 105.1°F (1974) | 39.9°F (1978) | 0.71 in (1966) |
| August 20 | 108.0°F (1973) | 35.1°F (1978) | 1.28 in (1993) |
| August 21 | 105.1°F (2024) | 45.0°F (2016) | 1.21 in (1998) |
| August 22 | 107.1°F (1960) | 45.0°F (2013) | 0.62 in (1990) |
| August 23 | 104.0°F (2021) | 42.1°F (1964) | 0.57 in (1992) |
| August 24 | 102.9°F (1959) | 44.1°F (1972) | 0.63 in (2007) |
| August 25 | 105.1°F (1991) | 44.1°F (1992) | 0.35 in (2023) |
| August 26 | 109.0°F (1970) | 46.0°F (1967) | 0.72 in (2016) |
| August 27 | 107.1°F (2010) | 45.0°F (1992) | 0.91 in (1997) |
| August 28 | 105.1°F (1969) | 43.0°F (1962) | 0.75 in (1978) |
| August 29 | 109.0°F (2012) | 42.1°F (1988) | 0.45 in (1999) |
| August 30 | 102.9°F (1990) | 42.1°F (1992) | 0.90 in (1999) |
| August 31 | 106.0°F (1960) | 41.0°F (1993) | 1.45 in (1986) |