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 start of August sees the average high-temperature at a still moderately hot 80.1°F (26.7°C), showing little difference from July's 81.7°F (27.6°C). Despite substantial daily fluctuations, the average low-temperature is a mild 58.3°F (14.6°C) during August.Humidity
August and September, with an average relative humidity of 52%, are the least humid months.Rainfall
In Keystone, South Dakota, in August, it is raining for 16.6 days, with typically 2.56" (65mm) of accumulated precipitation. Throughout the year, there are 135.4 rainfall days, and 20.39" (518mm) of precipitation is accumulated.Snowfall
June through August are months without snowfall.Daylight
The average length of the day in August is 13h and 56min.On the first day of the month, sunrise is at 5:43 am and sunset at 8:16 pm. On the last day of August, sunrise is at 6:16 am and sunset at 7:30 pm MDT.
Sunshine
The month with the most sunshine is August, with an average of 11.7h of sunshine.UV index
The average daily maximum UV index in August is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In August, the maximum UV index of 5 transforms into these recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average August temperature in Keystone?
What are the least humid months?
What is the average humidity in August?
How much does it rain in August?
When it does not snow?
Does it snow in August?
What is the average length of the day in August?
When are sunrise and sunset in August?
What month has the most sunshine?
How long on average sun shines in August?
How high is the UV index in August?
Average temperature in August
Keystone, SD
- Average high temperature in August: 80.1°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (29.8°F).
- Average low temperature in August: 58.3°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).
Average pressure in August
Keystone, SD
- Average pressure in August: 29.9"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in August
Keystone, SD
- Average wind speed in August: 7mph
The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in August
Keystone, SD
- Average humidity in August: 52%
The months with the highest relative humidity are January and February (77%).
The months with the lowest relative humidity are August and September (52%).
Average rainfall in August
Keystone, SD
- Average rainfall in August: 2.56"
The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in August
Keystone, SD
- Average rainfall days in August: 16.6 days
The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (4.5 days).
Average snowfall in August
Keystone, SD
- Average snowfall in August: 0"
The month with the highest snowfall is April (7.24").
The months with the least snowfall are June, July and August (0").
Average snowfall days in August
Keystone, SD
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in August /
Average sunshine in August
Keystone, SD
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in August: 11h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in August
Keystone, SD
- Average sunshine days in August: 9.9 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (7.8 days).
Average UV index in August
Keystone, SD
- Average UV index in August: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in August
Keystone, SD
- Average cloud cover in August: 17
The month with the most cloud cover is April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in August
Keystone, SD
- 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).
Keystone, South Dakota, USA
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