July weather in Keystone, SD
The average temperature in Keystone in July is 68.9°F (59.1°F–78.7°F). Average precipitation: 3.59 inches.
July is a summer month in Keystone, and is warmer than the annual average of 45.7°F. Daily temperatures swing about 19.6°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 58m. For travel, July is one of the best months of the year to visit.
Avg High
78.7°F
Avg Low
59.1°F
Precipitation
3.59 in
Daylight
14h 58m
July records in Keystone
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 95.0°F (1990) | 44.1°F (1992) | 1.07 in (2016) |
| July 2 | 99.0°F (1990) | 39.9°F (1972) | 1.25 in (2009) |
| July 3 | 98.1°F (1990) | 39.9°F (1972) | 0.90 in (2023) |
| July 4 | 98.1°F (1989) | 41.0°F (1972) | 2.50 in (1979) |
| July 5 | 96.1°F (1989) | 37.9°F (2006) | 1.64 in (2019) |
| July 6 | 99.0°F (1973) | 35.1°F (1986) | 1.01 in (2025) |
| July 7 | 100.0°F (1985) | 45.0°F (1993) | 0.66 in (2025) |
| July 8 | 99.0°F (1989) | 45.0°F (1965) | 1.55 in (1990) |
| July 9 | 97.0°F (1989) | 43.0°F (2003) | 1.17 in (2001) |
| July 10 | 100.0°F (1985) | 48.0°F (1993) | 0.67 in (1965) |
| July 11 | 100.0°F (1985) | 46.0°F (1993) | 1.77 in (2001) |
| July 12 | 98.1°F (1985) | 42.1°F (1987) | 1.08 in (1992) |
| July 13 | 97.0°F (2003) | 46.0°F (1967) | 0.73 in (1979) |
| July 14 | 98.1°F (1983) | 45.0°F (1970) | 1.24 in (1962) |
| July 15 | 99.0°F (2006) | 46.0°F (1976) | 1.70 in (2018) |
| July 16 | 100.0°F (1974) | 48.0°F (1979) | 1.33 in (1993) |
| July 17 | 97.0°F (1977) | 46.0°F (1972) | 2.25 in (2018) |
| July 18 | 97.0°F (2022) | 50.0°F (1992) | 1.27 in (1969) |
| July 19 | 100.0°F (1983) | 35.1°F (1989) | 1.03 in (1965) |
| July 20 | 96.1°F (1983) | 39.9°F (1988) | 1.53 in (1973) |
| July 21 | 96.1°F (2012) | 43.0°F (1990) | 1.41 in (2018) |
| July 22 | 97.0°F (1974) | 45.0°F (1992) | 0.79 in (1969) |
| July 23 | 96.1°F (1964) | 45.0°F (1992) | 1.57 in (2025) |
| July 24 | 96.1°F (2003) | 45.0°F (1992) | 2.52 in (1977) |
| July 25 | 97.0°F (2024) | 45.0°F (1992) | 0.76 in (2012) |
| July 26 | 93.9°F (1987) | 43.0°F (1979) | 0.77 in (1982) |
| July 27 | 96.1°F (2021) | 42.1°F (2008) | 1.69 in (2016) |
| July 28 | 98.1°F (2006) | 42.1°F (1971) | 1.20 in (2017) |
| July 29 | 97.0°F (2006) | 43.0°F (1971) | 1.08 in (1997) |
| July 30 | 100.0°F (2006) | 45.0°F (1971) | 0.94 in (1962) |
| July 31 | 95.0°F (1987) | 42.1°F (1968) | 1.70 in (1999) |