Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
The average high-temperature during August registers at a still warm 82.2°F (27.9°C), maintaining a close resemblance to the previous month. During August, River Sioux observes a consistent average nighttime temperature of 62.2°F (16.8°C).Heat index
For most parts of August, the heat index is estimated at a hot 87.8°F (31°C). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.Heat index details are generally centered around shaded locations and a mild breeze. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
Humidity
In River Sioux, the average relative humidity in August is 76%.Rainfall
In River Sioux, in August, during 14 rainfall days, 2.4" (61mm) of precipitation is typically accumulated. Throughout the year, in River Sioux, there are 125.1 rainfall days, and 22.64" (575mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In River Sioux, the average length of the day in August is 13h and 49min.On the first day of August, sunrise is at 6:18 am and sunset at 8:41 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 7:58 pm CDT.
Sunshine
In River Sioux, the average sunshine in August is 10.1h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 6 in August translates into this advice:
Prevent overexposure. Protection from the sun's harmful effects is needed. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in August in River Sioux?
What is the average humidity in August?
How much does it rain in August?
When it does not snow?
What is the average length of the day in August?
When are sunrise and sunset in August?
How many hours of sunshine does River Sioux have in August?
When is the highest UV index?
What is the UV index reading in August?
Average temperature in August
River Sioux, IA
- Average high temperature in August: 82.2°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in August: 62.2°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in August
River Sioux, IA
- Average pressure in August: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in August
River Sioux, IA
- Average wind speed in August: 7.5mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in August
River Sioux, IA
- Average humidity in August: 76%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (66%).
Average rainfall in August
River Sioux, IA
- Average rainfall in August: 2.4"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in August
River Sioux, IA
- Average rainfall days in August: 14 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in August
River Sioux, IA
- Average snowfall in August: 0"
The month with the highest snowfall is January (2.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
River Sioux, IA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
River Sioux, IA
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 10h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in August
River Sioux, IA
- Average sunshine days in August: 14.8 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in August
River Sioux, IA
- Average UV index in August: 6
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in August
River Sioux, IA
- Average cloud cover in August: 28
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in August
River Sioux, IA
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
River Sioux, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location