August weather forecastCuster, SD
August
Weather in August
As August arrives, Custer starts witnessing the measured fade of summer, unlike the peak summer seen in July. Declining temperatures and upcoming rainfall herald the close of the hot season. However, the differences are slight, keeping the atmosphere still comfortably warm. The arrival of August also indicates the end of the tourist peak season and the transition towards a relatively quieter time in the city. Despite being the tail-end of summer, outdoor enthusiasts can still enjoy Custer’s natural beauty with ease.Temperature
The arrival of August in Custer brings an average high-temperature of a still warm 80.1°F (26.7°C), closely following the temperature pattern of July. Despite drastic daytime highs, Custer logs an average low-temperature reading of 58.3°F (14.6°C) throughout August.Humidity
August and September, with an average relative humidity of 52%, are the least humid months.Rainfall
In Custer, in August, it is raining for 16.6 days, with typically 2.56" (65mm) of accumulated precipitation. Throughout the year, in Custer, there are 135.4 rainfall days, and 20.39" (518mm) of precipitation is accumulated.Snowfall
June through August are months without snowfall in Custer.Daylight
The average length of the day in August in Custer, South Dakota, is 13h and 56min.On the first day of the month, sunrise is at 5:44 am and sunset at 8:17 pm. On the last day of August, sunrise is at 6:17 am and sunset at 7:31 pm MDT.
Sunshine
August has the most sunshine of the year, with an average of 11.7h of sunshine.UV index
In August, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 5 during August translates into the following directions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Custer, 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
Custer, 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
Custer, 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
Custer, 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
Custer, 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
Custer, 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
Custer, 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
Custer, 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
Custer, SD
- Average daylight in August: 13h and 54min
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 42min
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
Custer, 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
Custer, 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
Custer, 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
Custer, 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).
