August weather forecast and climate
Sioux Falls, SD

The Sioux Falls in South Dakota, flowing downstream over rocks under the perfect evening skyline
The Sioux Falls in South Dakota, flowing downstream over rocks under the perfect evening skyline

Weather in August

August, the last month of the summer, in Sioux Falls, is also a moderately hot month, with average temperature varying between 59.5°F (15.3°C) and 81.1°F (27.3°C).

Temperature

In Sioux Falls, the average high-temperature in August is almost the same as in July - a still warm 81.1°F (27.3°C). In Sioux Falls, in August, the average low-temperature is 59.5°F (15.3°C).

Heat index

The average heat index in August is estimated at 85.5°F (29.7°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, differences in body mass, height, and shape, metabolic differences). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In August, the average relative humidity is 73%.

Rainfall

In August, the rain falls for 13.2 days. Throughout August, 2.24" (57mm) of precipitation is accumulated. Throughout the year, in Sioux Falls, there are 117.1 rainfall days, and 20.71" (526mm) of precipitation is accumulated.

Snowfall

In Sioux Falls, South Dakota, snow does not fall in June through September.

Daylight

In Sioux Falls, the average length of the day is 13.9h.

Sunshine

In August, the average sunshine in Sioux Falls is 9.9h.

UV index

In Sioux Falls, South Dakota, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in Sioux Falls?

In August, the average high-temperature is 81.1°F (27.3°C), and the average low-temperature is 59.5°F (15.3°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that represents influence of the relative humidity to air temperaure, in August is calculated to 85.5°F (29.7°C).

What is the average humidity in August in Sioux Falls?

In Sioux Falls, the average relative humidity in August is 73%.

How many days does it rain in August in Sioux Falls?

In Sioux Falls, South Dakota, in August, it is raining for 13.2 days, with typically 2.24" (57mm) of accumulated precipitation.

When it does not snow in Sioux Falls?

June through September are months without snowfall in Sioux Falls.

What is the average length of the day in August in Sioux Falls?

In Sioux Falls, the average length of the day in August is 13.9h.

How long on average sun shines in August in Sioux Falls?

In August, the average sunshine in Sioux Falls, South Dakota, is 9.9h.

How high is the UV index in August in Sioux Falls?

In August, the average daily maximum UV index in Sioux Falls, South Dakota, is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in August
Sioux Falls, SD

Average temperature in August - Sioux Falls, SD
  • Average high temperature in August: 81.1°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in August: 59.5°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).

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Average pressure in August
Sioux Falls, SD

Average pressure in August - Sioux Falls, SD
  • Average pressure in August: 29.93"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in August
Sioux Falls, SD

Average wind speed in August - Sioux Falls, SD
  • Average wind speed in August: 8.1mph

The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is July (8mph).

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Average humidity in August
Sioux Falls, SD

Average humidity in August - Sioux Falls, SD
  • Average humidity in August: 73%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (66%).

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Average rainfall in August
Sioux Falls, SD

Average rainfall in August - Sioux Falls, SD
  • Average rainfall in August: 2.24"

The wettest month (with the highest rainfall) is June (3.27").
The driest months (with the least rainfall) are January, February and November (0.67").

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Average rainfall days in August
Sioux Falls, SD

Average rainfall days in August - Sioux Falls, SD
  • Average rainfall days in August: 13.2 days

The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).

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Average snowfall in August
Sioux Falls, SD

Average snowfall in August - Sioux Falls, SD
  • Average snowfall in August: 0"

The month with the highest snowfall is February (4.25").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Sioux Falls, SD

Average snowfall days in August - Sioux Falls, SD
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (11.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Sioux Falls, SD

Average daylight in August / Average sunshine in August - Sioux Falls, SD
  • Average daylight in August: 13.9h

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in August: 9.9h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 4h).

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Average sunshine days in August
Sioux Falls, SD

Average sunshine days in August - Sioux Falls, SD
  • Average sunshine days in August: 15.1 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is June (10 days).

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Average UV index in August
Sioux Falls, SD

Average UV index in August - Sioux Falls, SD
  • Average UV index in August: 5

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in August
Sioux Falls, SD

Average cloud cover in August - Sioux Falls, SD
  • Average cloud cover in August: 30

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 27).

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Average visibility in August
Sioux Falls, SD

Average visibility in August - Sioux Falls, SD
  • Average visibility in August: 6mi

Months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

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