August weather forecast and climate
South Dakota, USA

August is a beautiful summer month in South Dakota that sees moderately warm temperatures and brilliant sunshine. The average high temperatures are in the 75°F (23.9°C) to 85°F (29.4°C) range, while the average low temperatures are between 55°F (12.8°C) and 60°F (15.6°C).
Rain is to the tune of 2" (51mm) to 3" (76mm) in the majority of the state. Although the rain is light, August experiences thunderstorms and is vulnerable to occasional tornadoes.
Lemmon in western South Dakota averages between 57°F (13.9°C) to 85°F (29.4°C), Pickstown in the central portion 61°F (16.1°C) to 87°F (30.6°C), while the Waubay Wildlife Refuge in the east registers 60°F (15.6°C) to 81°F (27.2°C). The Black Hills in South Dakota consists of some of the tallest mountains east of the Rockies that receive moderate to heavy rainfall in August and are colder than the rest of the state.
Light sweatshirts are sufficient in August to explore plains as well as the high mountain trails. Keep in mind that the grasslands have little shade as most of the trees are near the rivers, lakes, and the mountain slopes.