August weather in Spearfish, SD
The average temperature in Spearfish in August is 69.5°F (56.1°F–82.9°F). Average precipitation: 1.88 inches.
August is a summer month in Spearfish, and is warmer than the annual average of 46.5°F. Daily temperatures swing about 26.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 13h 52m. For travel, August is a comfortable month to visit.
Avg High
82.9°F
Avg Low
56.1°F
Precipitation
1.88 in
Daylight
13h 52m
August records in Spearfish
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 104.0°F (1900) | 42.1°F (1920) | 1.08 in (1914) |
| August 2 | 102.0°F (1938) | 43.0°F (2018) | 1.30 in (1953) |
| August 3 | 104.0°F (1934) | 39.0°F (1978) | 3.65 in (1922) |
| August 4 | 104.0°F (1941) | 41.0°F (1952) | 0.85 in (1919) |
| August 5 | 102.9°F (1941) | 39.0°F (1906) | 1.17 in (2023) |
| August 6 | 100.0°F (1893) | 41.0°F (1906) | 1.25 in (1929) |
| August 7 | 100.9°F (1949) | 42.1°F (1985) | 2.35 in (1970) |
| August 8 | 104.0°F (1975) | 41.0°F (1906) | 1.08 in (2009) |
| August 9 | 102.0°F (1958) | 41.0°F (1917) | 1.20 in (2009) |
| August 10 | 102.9°F (1935) | 33.1°F (1917) | 0.95 in (1920) |
| August 11 | 102.9°F (2000) | 39.9°F (1902) | 1.22 in (1974) |
| August 12 | 104.0°F (1938) | 37.9°F (1920) | 1.63 in (1966) |
| August 13 | 102.0°F (1893) | 39.9°F (1966) | 0.91 in (1997) |
| August 14 | 100.9°F (1935) | 44.1°F (1985) | 1.00 in (2013) |
| August 15 | 100.9°F (1929) | 46.9°F (1966) | 1.39 in (1927) |
| August 16 | 98.1°F (1906) | 45.0°F (1893) | 1.02 in (1960) |
| August 17 | 100.0°F (1959) | 39.9°F (1944) | 1.85 in (1912) |
| August 18 | 100.9°F (1959) | 41.0°F (1985) | 2.20 in (2015) |
| August 19 | 100.9°F (1948) | 41.0°F (1920) | 1.27 in (1972) |
| August 20 | 100.0°F (1986) | 37.0°F (1920) | 1.68 in (2024) |
| August 21 | 99.0°F (1894) | 39.0°F (1951) | 1.76 in (1964) |
| August 22 | 102.0°F (2010) | 39.0°F (1966) | 1.10 in (1893) |
| August 23 | 102.0°F (1937) | 37.9°F (1966) | 0.60 in (2007) |
| August 24 | 98.1°F (1976) | 32.0°F (1985) | 0.53 in (2005) |
| August 25 | 99.0°F (2000) | 37.0°F (1910) | 0.65 in (1933) |
| August 26 | 102.0°F (1926) | 32.0°F (1906) | 0.48 in (2011) |
| August 27 | 100.9°F (1937) | 39.0°F (1906) | 2.25 in (1903) |
| August 28 | 99.0°F (1924) | 33.1°F (1911) | 0.54 in (2020) |
| August 29 | 99.0°F (1950) | 37.0°F (1920) | 1.90 in (1920) |
| August 30 | 100.9°F (1948) | 33.1°F (1920) | 0.80 in (2011) |
| August 31 | 102.0°F (1954) | 37.0°F (1908) | 1.07 in (1951) |