Weather history and climate summary information is available for the following locations:
- Huron
- Rapid City
- Sioux Falls
- Watertown
Warmest August Days
The warmest August days in South Dakota are:
| Rapid City, South Dakota | 1975 | 107.1°F |
| Huron, South Dakota | 2003 | 107.1°F |
| Huron, South Dakota | 1988 | 107.1°F |
| Sioux Falls, South Dakota | 1988 | 107.1°F |
| Sioux Falls, South Dakota | 1973 | 107.1°F |
Coldest August Days
The coldest August days in South Dakota were:
| Rapid City, South Dakota | 1992 | 36.9°F |
| Huron, South Dakota | 1988 | 37°F |
| Watertown, South Dakota | 1950 | 37.9°F |
| Watertown, South Dakota | 1987 | 37.9°F |
| Watertown, South Dakota | 1992 | 37.9°F |
Wettest August Days
The wettest single days in August occurred:
| Rapid City, South Dakota | 2006 | 4.3 inches |
| Huron, South Dakota | 2007 | 3.5 inches |
| Watertown, South Dakota | 1994 | 3.4 inches |
| Watertown, South Dakota | 2008 | 3.3 inches |
| Watertown, South Dakota | 1987 | 3.1 inches |