August weather forecast
South Dakota, USA

August in South Dakota can be described as a transitional month, as the intense heat of peak summer begins to wane, making way for the early hints of the forthcoming autumn season. Daytime temperatures during August generally lie between 75°F (23.9°C) and 85°F (29.4°C). While still warm, they are typically milder than the highs of July. The nights see a more pronounced dip in temperatures, ranging from 55°F (12.8°C) to 65°F (18.3°C), offering a cooler and more comfortable ambiance.

The Black Hills, due to their unique geography, continue to show slightly cooler temperatures, especially during nighttime. This makes the region an attractive spot for those looking to escape the residual summer heat.

Rainfall in August is moderate, and the frequency of thunderstorms begins to decline. However, sporadic heavy showers or even short-lived storms are not uncommon, given the changing season and atmospheric patterns. The southeastern regions still remain watchful, considering their proximity to Tornado Alley.

The transition from July to August is evident in the slightly lowered temperatures and the subtle shifts in the natural environment. Trees and vegetation start preparing for the fall, and there's a perceptible change in the air.

As August progresses, the days become noticeably shorter, and the warmth of summer gradually yields to the cooler, more temperate aura of September, which brings with it the full beauty and transformation of the autumn season in South Dakota.

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• Sioux Falls - August »
  In Sioux Falls, South Dakota, during August, the rain falls for 13.2 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Sioux Falls, South Dakota, the average relative humidity in August is 73%.
• Rapid City - August »
  The months with the lowest humidity in Rapid City, South Dakota, are August and September, with an average relative humidity of 50%. On the first day of August in Rapid City sunrise is at 5:41 am and sunset at 8:16 pm.
• Aberdeen - August »
  August and September, with an average relative humidity of 60%, are the least humid months in Aberdeen, South Dakota. In Aberdeen, South Dakota, during August, the rain falls for 10.4 days and regularly aggregates up to 1.61" (41mm) of precipitation.
• Brookings - August »
  On the first day of August in Brookings, South Dakota, sunrise is at 6:15 am and sunset at 8:51 pm. On the first day of August in Brookings sunrise is at 6:15 am and sunset at 8:51 pm.
• Watertown - August »
  On the last day of August, in Watertown sunrise is at 6:50 am and sunset at 8:06 pm CDT. In August, the average relative humidity in Watertown, South Dakota, is 69%.
• Mitchell - August »
  In Mitchell, South Dakota, in August, during 10.5 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Mitchell notes a substantial temperature decline from the daytime peaks throughout August, with an average nighttime temperature of 62.1°F (16.7°C).
• Yankton - August »
  In Yankton during August, the rain falls for 14.2 days and regularly aggregates up to 2.24" (57mm) of precipitation. August brings to Yankton, South Dakota, the peak of summer with plenty of sun, but temperatures slightly reduce as compared to July, reaching up to 83.3°F (28.5°C).
• Pierre - August »
  In Pierre, South Dakota, in August, it is raining for 11.9 days, with typically 1.34" (34mm) of accumulated precipitation. August in Pierre, South Dakota continues riding the high wave of summer, with warm temperatures and clear skies.
• Huron - August »
  On the first day of August in Huron sunrise is at 6:20 am and sunset at 8:57 pm. With August, Huron experiences the last full month of summer, marked by substantial daylight and high humidity.
• Spearfish - August »
  In Spearfish snow does not fall in June through August. In Spearfish in August, during 11.8 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.
• Vermillion - August »
  June through August, with an average maximum UV index of 6, are months with the highest UV index in Vermillion, South Dakota. An average nighttime temperature of 61.3°F (16.3°C) is observed in Vermillion during August.
• Brandon - August »
  On the first day of August in Brandon sunrise is at 6:16 am and sunset at 8:48 pm. On the first day of August in Brandon, South Dakota, sunrise is at 6:16 am and sunset at 8:48 pm.