August Weather in Sioux Falls, United States

Last updated: June 24, 2025

In August, the average temperature in Sioux Falls, United States is a comfortable 22°C (72°F). However, temperatures can range from a cool 8°C (47°F) to a warm 36°C (96°F). Expect 94 mm (3.7 in) of precipitation over about 10 days, with the air maintaining an average humidity of 80%. Whether you're enjoying the mild weather or bracing for a rain shower, Sioux Falls offers a unique atmosphere this time of year!

August Temperature in Sioux Falls

In August in Sioux Falls, the average temperature is 22°C (72°F), with maximum temperatures potentially reaching 36°C (96°F) and minimums dipping as low as 8°C (47°F). This makes it an ideal time for travelers seeking pleasant weather and a variety of outdoor activities.

August Weather in Sioux Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Sioux Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sioux Falls, August typically has an average temperature of 22°C (72°F), with highs reaching up to 36°C (96°F) and lows dropping to around 8°C (47°F).

Data source: Temperature data for Sioux Falls generated using information from the Copernicus Climate Change Service.

August Precipitation in Sioux Falls

In Sioux Falls in August, the precipitation amount is 94 mm (3.7 in) over a duration of 10 days.

August Precipitation Trends in Sioux Falls

The chart displays monthly precipitation patterns in Sioux Falls, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Sioux Falls, August typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

August Humidity in Sioux Falls

In Sioux Falls in August humidity is 80%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket that can quickly sap your energy while traveling, making you feel sticky and uncomfortable if you're not prepared.

August Average Humidity in Sioux Falls

This chart illustrates the average monthly humidity levels in Sioux Falls, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Sioux Falls is approximately 80%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Sioux Falls

In Sioux Falls in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Sioux Falls.

Maximum UV Index Levels in Sioux Falls for August

The chart shows the monthly maximum UV Index (UVI) for Sioux Falls in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Sioux Falls typically reaches 9, which falls under the very high exposure category.

Data source: Sioux Falls August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How August Weather in Sioux Falls Compares to Other Months

Weather in Sioux Falls varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Sioux Falls, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sioux Falls, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	21 mm (0.8 inches)	80%	low
February Weather	-7°C (20°F)	24 mm (0.9 inches)	84%	moderate
March Weather	2°C (35°F)	65 mm (2.6 inches)	75%	moderate
April Weather	7°C (45°F)	82 mm (3.2 inches)	79%	very high
May Weather	15°C (59°F)	128 mm (5.0 inches)	74%	very high
June Weather	23°C (73°F)	85 mm (3.3 inches)	81%	extreme
July Weather	24°C (75°F)	77 mm (3.0 inches)	82%	very high
August Weather	22°C (72°F)	94 mm (3.7 inches)	80%	very high
September Weather	18°C (65°F)	107 mm (4.2 inches)	75%	very high
October Weather	9°C (48°F)	79 mm (3.1 inches)	77%	moderate
November Weather	1°C (35°F)	25 mm (1.0 inches)	85%	moderate
December Weather	-3°C (26°F)	39 mm (1.5 inches)	83%	low