August weather in Watertown, SD
The average temperature in Watertown in August is 68.5°F (57.5°F–79.5°F). Average precipitation: 2.89 inches.
August is a summer month in Watertown, and is warmer than the annual average of 43°F. Daily temperatures swing about 22°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 13h 53m. For travel, August is one of the best months of the year to visit.
Avg High
79.5°F
Avg Low
57.5°F
Precipitation
2.89 in
Daylight
13h 53m
August records in Watertown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 102.0°F (1930) | 39.9°F (1927) | 1.87 in (1903) |
| August 2 | 102.9°F (1930) | 39.0°F (1971) | 2.28 in (1956) |
| August 3 | 104.0°F (1930) | 37.9°F (1915) | 1.78 in (1984) |
| August 4 | 105.1°F (1934) | 39.9°F (1915) | 1.30 in (1911) |
| August 5 | 97.0°F (1937) | 41.0°F (1915) | 2.09 in (2025) |
| August 6 | 102.9°F (1933) | 37.9°F (1902) | 1.95 in (1900) |
| August 7 | 100.0°F (1983) | 37.9°F (1904) | 2.15 in (1909) |
| August 8 | 104.0°F (1934) | 39.9°F (1904) | 3.14 in (1987) |
| August 9 | 104.0°F (1947) | 37.9°F (1927) | 3.37 in (1994) |
| August 10 | 102.9°F (1947) | 39.9°F (1982) | 2.05 in (2008) |
| August 11 | 100.0°F (1933) | 33.1°F (1902) | 3.90 in (2016) |
| August 12 | 99.0°F (1922) | 41.0°F (1898) | 1.80 in (1956) |
| August 13 | 102.0°F (1965) | 35.1°F (1964) | 2.10 in (2023) |
| August 14 | 100.0°F (1928) | 37.9°F (1929) | 2.20 in (1993) |
| August 15 | 102.0°F (1937) | 44.1°F (1929) | 1.71 in (1951) |
| August 16 | 100.9°F (1988) | 45.0°F (1898) | 1.25 in (1987) |
| August 17 | 98.1°F (1976) | 39.0°F (1943) | 1.60 in (2005) |
| August 18 | 100.0°F (1976) | 39.9°F (1897) | 3.08 in (2015) |
| August 19 | 99.0°F (1976) | 37.9°F (1967) | 1.95 in (1899) |
| August 20 | 97.0°F (1955) | 37.0°F (1907) | 4.32 in (2002) |
| August 21 | 99.0°F (1929) | 37.9°F (2004) | 2.73 in (1916) |
| August 22 | 98.1°F (1971) | 35.1°F (1923) | 1.17 in (1954) |
| August 23 | 98.1°F (1936) | 37.0°F (1927) | 1.90 in (1955) |
| August 24 | 105.1°F (1936) | 34.0°F (1934) | 1.48 in (1905) |
| August 25 | 98.1°F (1926) | 37.0°F (1934) | 1.35 in (1960) |
| August 26 | 100.0°F (1973) | 37.0°F (1910) | 1.48 in (1921) |
| August 27 | 100.0°F (1973) | 37.9°F (1906) | 1.42 in (1927) |
| August 28 | 98.1°F (1984) | 32.0°F (1965) | 1.41 in (1932) |
| August 29 | 97.0°F (1921) | 35.1°F (1909) | 2.03 in (1928) |
| August 30 | 95.0°F (1930) | 36.0°F (1915) | 2.51 in (1971) |
| August 31 | 93.9°F (1898) | 37.9°F (1928) | 0.98 in (1977) |